C

Cartesia

Sells Sonic text-to-speech and Ink speech-to-text models through one API, and Managed Agents, a hosted platform for building and running voice agents on those models.

Partner of Together AI

Partner of Captions

Supplies Vapi

Supplies Rox

Supplies Retell AI

StageEarly-stage

Founded—

HeadquartersSan Francisco, USA

StatusPrivate

Products

Selected offerings — the AI products recorded here, not the vendor's full catalogue.

• Sonic / Ink API service Sold on its own

  Sonic (text-to-speech) and Ink (speech-to-text) are Cartesia's voice-generation models, sold via API to developers and enterprises building voice agents.

• Managed Agents Agent platform Sold on its own

  Cartesia's managed platform for building and running realtime voice agents: Ink speech-to-text, an LLM you choose and Sonic text-to-speech, with turn-taking, tool calling, telephony (SIP trunking) and built-in evaluations handled by the platform.

Closest alternatives 11

RRimeUndisclosedCartesia's own comparison page ranks Sonic above Rime's Mist and Coda models for text-to-speech.1 of 3 capabilitiesShared product typeSourced competitorCreate synthetic voice and audioCompareBABland AIEarly-stageCartesia presents Managed Agents as the alternative to Bland for voice agents; both are managed platforms for building phone/voice agents.2 of 3 capabilitiesShared product typeSame scale bandSourced competitorBuild and run AI agentsCompareIAInworld AIUndisclosedCartesia's own comparison page ranks Sonic above Inworld's Realtime TTS models for text-to-speech.3 of 3 capabilitiesShared product typeSourced competitorCreate synthetic voice and audioCompareEElevenLabsLate-stageCartesia names ElevenLabs as the TTS it is chosen over for production voice agents; same speech-generation job, Cartesia pitching latency and quality.3 of 3 capabilitiesShared product typeSourced competitorCreate synthetic voice and audioCompareDDeepgramLate-stageCartesia compares Sonic with Deepgram's Flux TTS in listener ratings: same speech-generation job.3 of 3 capabilitiesShared product typeSourced competitorTurn speech into textCreate synthetic voice and audioCompareMMicrosoftPublicCartesia compares Sonic with Azure's TTS voices on rating and speed; the Azure Speech record also includes STT, so the match is on the TTS half.2 of 3 capabilitiesShared product typeSourced competitorCreate synthetic voice and audioCompareAAmazonPublicCartesia ranks Sonic above every Polly engine for voice agents: same speech-generation job.3 of 3 capabilitiesShared product typeSourced competitorCreate synthetic voice and audioCompareXxAIAcquiredCartesia names xAI's Grok Voice API as the alternative it rates higher and runs faster than.3 of 3 capabilitiesShared product typeSourced competitorCreate synthetic voice and audioCompareOOpenAILate-stageCartesia's own comparison page sets Sonic against OpenAI's GPT-Realtime-2 speech model for text-to-speech.2 of 3 capabilitiesShared product typeSourced competitorCreate synthetic voice and audioCompareHAHume AIUndisclosedCartesia compares Sonic head to head with Hume's Octave TTS on quality, speed and cost for voice agents.3 of 3 capabilitiesShared product typeSourced competitorCreate synthetic voice and audioCompareRAResemble AIEarly-stageCartesia ranks Sonic against Resemble's Chatterbox TTS models in listener tests, the same speech-generation job.3 of 3 capabilitiesShared product typeSourced competitorCreate synthetic voice and audioCompare

Similar products 139

How this list is ranked ↗

CCerencePublicSonic / Ink and Cerence Voice Lab do comparable work on speech to text and text to speech; both also serve buyers who need to create synthetic voice and audio and turn speech into text; Cartesia's scale not recorded; ships AI agent, application and 2 more rather than the same layer.3 of 3 capabilitiesDifferent layerCompareWLWellSaid LabsUndisclosedSonic / Ink and WellSaid API both list text to speech; both also serve buyers who need to create synthetic voice and audio; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareTTwilioPublicSonic / Ink and Conversation Relay do comparable work on speech to text and text to speech; both also serve buyers who need to create synthetic voice and audio and turn speech into text; Cartesia's scale not recorded.3 of 3 capabilitiesShared product typeCompareOOraclePublicSonic / Ink and OCI Speech do comparable work on speech to text and text to speech; both also serve buyers who need to create synthetic voice and audio and turn speech into text; Cartesia's scale not recorded.3 of 3 capabilitiesShared product typeCompareFRFurhat RoboticsUndisclosedManaged Agents and FurhatAI Creator both list voice agent; scale not recorded for either; ships application, platform and 1 more rather than the same layer.3 of 3 capabilitiesDifferent layerCompareYYandexPublicSonic / Ink and Yandex SpeechKit do comparable work on speech to text and text to speech; both also serve buyers who need to create synthetic voice and audio and turn speech into text; Cartesia's scale not recorded.3 of 3 capabilitiesShared product typeCompareSSpeechifyUndisclosedSonic / Ink and SpeechifyAI both list text to speech; both also serve buyers who need to create synthetic voice and audio; scale not recorded for either.2 of 3 capabilitiesShared product typeCompareIiFlytekPublicSonic / Ink and iFLYTEK Open Platform (Global) do comparable work on speech to text and text to speech; both also serve buyers who need to turn speech into text; scale not recorded for either.3 of 3 capabilitiesShared product typeCompareMAMurf AIEarly-stageSonic / Ink and Murf API both list text to speech; both also serve buyers who need to create synthetic voice and audio; scale not recorded for either.2 of 3 capabilitiesShared product typeCompareRRespeecherEarly-stageSonic / Ink and Respeecher Space both list text to speech; both also serve buyers who need to create synthetic voice and audio; scale not recorded for either.2 of 3 capabilitiesShared product typeCompareOOmniDimensionUndisclosedManaged Agents and OmniDimension both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareKVKindred VoiceUndisclosedManaged Agents and Kindred Voice both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareHCHuawei CloudUndisclosedSonic / Ink and Speech Interaction Service do comparable work on speech to text and text to speech; both also serve buyers who need to create synthetic voice and audio and turn speech into text; scale not recorded for either.2 of 3 capabilitiesShared product typeCompareRRingCentralPublicManaged Agents and AI Receptionist both list voice agent; Cartesia's scale not recorded; ships AI agent, application and 1 more rather than the same layer.2 of 3 capabilitiesDifferent layerCompareSSpekoUndisclosedSonic / Ink and Speko do comparable work on speech to text and text to speech; both also serve buyers who need to turn speech into text; scale not recorded for either.3 of 3 capabilitiesShared product typeCompareIIBMPublicSonic / Ink and IBM Watson Text to Speech both list text to speech; both also serve buyers who need to create synthetic voice and audio; Cartesia's scale not recorded.3 of 3 capabilitiesShared product typeCompareSSpeechmaticsUndisclosedSonic / Ink and Text to Speech both list text to speech; both also serve buyers who need to create synthetic voice and audio; scale not recorded for either.2 of 3 capabilitiesShared product typeCompareAAutocallsUndisclosedManaged Agents and Autocalls.ai both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareHHeyGenEarly-stageSonic / Ink and LiveAvatar do comparable work on speech to text and text to speech; Cartesia's scale not recorded.3 of 3 capabilitiesShared product typeCompareDDeepLLate-stageSonic / Ink and DeepL Voice for Meetings do comparable work on speech to text and text to speech; both also serve buyers who need to turn speech into text; Cartesia's scale not recorded; ships application and model API rather than the same layer.2 of 3 capabilitiesDifferent layerComparePPolyAIUndisclosedManaged Agents and Dialog Studio both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareTATalkio AIUndisclosedSonic / Ink and TalkaType both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships application rather than the same layer.2 of 3 capabilitiesDifferent layerCompareAAwaz.aiUndisclosedManaged Agents and Awaz.ai both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareSTSK TelecomPublicManaged Agents and NUGU bizcall both list voice agent; scale not recorded for either; ships application and infrastructure service rather than the same layer.2 of 3 capabilitiesDifferent layerCompareSSynthesiaLate-stageManaged Agents and Survey Sessions both list voice agent; Cartesia's scale not recorded; ships AI agent and application rather than the same layer.3 of 3 capabilitiesDifferent layerComparePPhonicUndisclosedManaged Agents and Phonic both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareGGladiaUndisclosedSonic / Ink and Gladia Speech-to-Text API both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareBBridgeMindUndisclosedSonic / Ink and BridgeVoice both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareZZoomPublicSonic / Ink and Zoom Scribe API both list speech to text; both also serve buyers who need to turn speech into text; Cartesia's scale not recorded.3 of 3 capabilitiesShared product typeComparePPhonelyEarly-stageManaged Agents and Phonely both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareSASoundHound AIPublicManaged Agents and OASYS both list voice agent; Cartesia's scale not recorded.1 of 3 capabilitiesShared product typeCompareSSpeakLate-stageSonic / Ink and Speak both list speech to text; both also serve buyers who need to create synthetic voice and audio and turn speech into text; Cartesia's scale not recorded; ships application rather than the same layer.2 of 3 capabilitiesDifferent layerCompareTtelliEarly-stageManaged Agents and telli both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareAAssemblyAILate-stageSonic / Ink and AssemblyAI Pre-recorded Speech-to-Text API both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either.3 of 3 capabilitiesShared product typeCompareSSynthflowEarly-stageManaged Agents and Synthflow Voice AI Agents both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareAAdobePublicSonic / Ink and Adobe Podcast both list speech to text; both also serve buyers who need to create synthetic voice and audio and turn speech into text; Cartesia's scale not recorded.2 of 3 capabilitiesShared product typeCompareKKrispUndisclosedSonic / Ink and Krisp both list speech to text; both also serve buyers who need to create synthetic voice and audio and turn speech into text; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareSASarvam AILate-stageSonic / Ink and Sarvam Text to Speech both list text to speech; Cartesia's scale not recorded.3 of 3 capabilitiesShared product typeCompareWFWispr FlowLate-stageSonic / Ink and Wispr Flow Dictation both list speech to text; both also serve buyers who need to turn speech into text; Cartesia's scale not recorded; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareGGensparkLate-stageSonic / Ink and Speakly both list speech to text; both also serve buyers who need to turn speech into text; Cartesia's scale not recorded; ships AI agent, application and 2 more rather than the same layer.1 of 3 capabilitiesDifferent layerCompareNCNAVER CloudUndisclosedSonic / Ink and CLOVA Voice both list text to speech; both also serve buyers who need to create synthetic voice and audio; scale not recorded for either.3 of 3 capabilitiesShared product typeCompareSASimple AIEarly-stageManaged Agents and Simple AI both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareTTrilletUndisclosedManaged Agents and Trillet Voice both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareDDuolingoPublicSonic / Ink and Duolingo English Test both list speech to text; both also serve buyers who need to turn speech into text; Cartesia's scale not recorded; ships application rather than the same layer.2 of 3 capabilitiesDifferent layerCompareMAMistral AILate-stageSonic / Ink and Mistral Speech do comparable work on speech to text and text to speech; both also serve buyers who need to create synthetic voice and audio and turn speech into text; Cartesia's scale not recorded.3 of 3 capabilitiesShared product typeCompareRRibbonEarly-stageManaged Agents and Ribbon API both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareEEvergroveUndisclosedManaged Agents and Evergrove both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareFForethoughtAcquiredManaged Agents and Forethought Voice both list voice agent; Cartesia's scale not recorded; Forethought is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareHHaptikAcquiredManaged Agents and Voice AI Agents both list voice agent; Cartesia's scale not recorded; Haptik is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareFFirefliesUndisclosedSonic / Ink and Fireflies Talk both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships AI agent and application rather than the same layer.2 of 3 capabilitiesDifferent layerCompareSSonioxUndisclosedSonic / Ink and Soniox Text-to-Speech API both list text to speech; both also serve buyers who need to create synthetic voice and audio; scale not recorded for either.2 of 3 capabilitiesShared product typeCompareNNiCEPublicManaged Agents and AI Agents for Self-Service both list voice agent; Cartesia's scale not recorded.2 of 3 capabilitiesShared product typeCompareGGradiumLate-stageSonic / Ink and Text-to-Speech both list text to speech; both also serve buyers who need to create synthetic voice and audio; scale not recorded for either; ships model API rather than the same layer.1 of 3 capabilitiesDifferent layerCompareRRevionUndisclosedManaged Agents and Revion AI voice agents both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareCCogramUndisclosedSonic / Ink and Meeting Minutes both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareLLeexiUndisclosedSonic / Ink and Leexi AI Notetaker both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareMMeetGeekUndisclosedSonic / Ink and Meeting Agent both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareNNotionLate-stageSonic / Ink and Notion AI Meeting Notes both list speech to text; both also serve buyers who need to turn speech into text; Cartesia's scale not recorded; ships AI agent, application and 1 more rather than the same layer.1 of 3 capabilitiesDifferent layerCompareDDescriptUndisclosedSonic / Ink and Descript Rooms both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships AI agent and application rather than the same layer.2 of 3 capabilitiesDifferent layerCompareBBrightHireEarly-stageSonic / Ink and BrightHire Interview Intelligence both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships AI agent, application and 1 more rather than the same layer.2 of 3 capabilitiesDifferent layerCompareAAbridgeLate-stageSonic / Ink and Abridge both list speech to text; both also serve buyers who need to turn speech into text; Cartesia's scale not recorded; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareRARead AIEarly-stageSonic / Ink and Read AI both list speech to text; both also serve buyers who need to turn speech into text; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerSame scale bandCompareLLinagoraUndisclosedSonic / Ink and LinTO Studio both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships application and model API rather than the same layer.1 of 3 capabilitiesDifferent layerCompareTtl;dvUndisclosedSonic / Ink and AI Agents for Meetings both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareEEchoCallUndisclosedManaged Agents and AI Voice Agent both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareFFyxerEarly-stageSonic / Ink and AI meeting notetaker both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareFFathomAcquiredSonic / Ink and Fathom both list speech to text; both also serve buyers who need to turn speech into text; Cartesia's scale not recorded; Fathom is acquired, with no independent scale; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareOOtter.aiUndisclosedSonic / Ink and Otter Meeting Agent both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships AI agent and application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareAAllooviumUndisclosedManaged Agents and Alloovium both list voice agent; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareCACallbook AIUndisclosedManaged Agents and Callbook AI both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareLLunaBillUndisclosedManaged Agents and LunaBill both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareBBrieflyUndisclosedSonic / Ink and Briefly AI Assistant both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareMMinutesLinkUndisclosedSonic / Ink and MinutesLink both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareSScribblUndisclosedSonic / Ink and Scribbl both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareGGranolaLate-stageSonic / Ink and Granola both list speech to text; both also serve buyers who need to turn speech into text; Cartesia's scale not recorded; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareMMagnificUndisclosedSonic / Ink and Magnific Creative Suite both list text to speech; both also serve buyers who need to create synthetic voice and audio; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareMAMillis AIUndisclosedManaged Agents and Millis AI both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeComparePPlaudUndisclosedSonic / Ink and Plaud Desktop both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareVSVerint SystemsAcquiredSonic / Ink and Verint Da Vinci AI and Bots both list speech to text; both also serve buyers who need to turn speech into text; Cartesia's scale not recorded; Verint Systems is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareCCallSphereUndisclosedManaged Agents and AI Voice & Chat Agents both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareGLGradient LabsEarly-stageManaged Agents and Lending agent both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareLLorikeetEarly-stageManaged Agents and Concierge both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareMAMaven AGIEarly-stageManaged Agents and AI Agents both list voice agent; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerSame scale bandCompareNNeuphonicUndisclosedSonic / Ink and NeuTTS-2M both list text to speech; both also serve buyers who need to create synthetic voice and audio; scale not recorded for either; ships developer tool rather than the same layer.1 of 3 capabilitiesDifferent layerCompareTTwigUndisclosedManaged Agents and Sera both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareFfonio.aiUndisclosedManaged Agents and AI Phone Assistant both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareYYellow.aiUndisclosedManaged Agents and Yellow.ai Agentic AI Platform both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeCompareOOneInboxUndisclosedManaged Agents and OneInbox both list voice agent; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareCCarSignalUndisclosedManaged Agents and CarSignal both list voice agent; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareLLListen LabsLate-stageManaged Agents and Listen both list voice agent; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareFFlikiUndisclosedSonic / Ink and Fliki both list text to speech; both also serve buyers who need to create synthetic voice and audio; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareFFinAcquiredManaged Agents and Fin Voice both list voice agent; Cartesia's scale not recorded; Fin is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareLLivePersonAcquiredManaged Agents and Conversational Cloud both list voice agent; Cartesia's scale not recorded; LivePerson is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareCCognigyAcquiredManaged Agents and Cognigy.AI both list voice agent; Cartesia's scale not recorded; Cognigy is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareHAHedy AIUndisclosedSonic / Ink and Hedy both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareSSalesforcePublicManaged Agents and Agentforce Voice both list voice agent; Cartesia's scale not recorded.1 of 3 capabilitiesShared product typeCompareBBernardUndisclosedManaged Agents and Bernard both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareRRinglyUndisclosedManaged Agents and Seth both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareHHaladirUndisclosedManaged Agents and Haladir Nomos and Talon both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareTTwinMindUndisclosedSonic / Ink and TwinMind both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareCCrescendoEarly-stageManaged Agents and Crescendo Concierge both list voice agent; Cartesia's scale not recorded.1 of 3 capabilitiesShared product typeCompareEEliteUndisclosedManaged Agents and Elite Health both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerComparePParloaLate-stageManaged Agents and Parloa AMP both list voice agent; Cartesia's scale not recorded.1 of 3 capabilitiesShared product typeCompareRRoundedUndisclosedManaged Agents and Donna both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareFFiniEarly-stageManaged Agents and Fini AI agent both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareRRegalEarly-stageManaged Agents and Phone AI Agents both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareKHKakao HealthcareUndisclosedSonic / Ink and PASTA both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships application and data service rather than the same layer.1 of 3 capabilitiesDifferent layerCompareHAHippocratic AILate-stageManaged Agents and AI Physician Front Door both list voice agent; Cartesia's scale not recorded.1 of 3 capabilitiesShared product typeCompareAAvomaUndisclosedSonic / Ink and Avoma both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareAAptenUndisclosedManaged Agents and Apten both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareAAArrowhead AIUndisclosedManaged Agents and Arrowhead AI both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareDDeryaUndisclosedManaged Agents and Derya both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareDDaptaEarly-stageManaged Agents and AI Voice Agent both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareDDecagonLate-stageManaged Agents and Decagon both list voice agent; Cartesia's scale not recorded.1 of 3 capabilitiesShared product typeCompareAAtlassianPublicManaged Agents and Customer Service Management both list voice agent; Cartesia's scale not recorded.1 of 3 capabilitiesShared product typeCompareSSierraLate-stageManaged Agents and Sierra both list voice agent; Cartesia's scale not recorded; ships AI agent, application and 1 more rather than the same layer.1 of 3 capabilitiesDifferent layerComparePPhenomLate-stageSonic / Ink and Phenom Interview Intelligence both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships AI agent, application and 2 more rather than the same layer.2 of 3 capabilitiesDifferent layerCompareCCrestaLate-stageManaged Agents and AI Receptionist both list voice agent; Cartesia's scale not recorded; ships AI agent and application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareAHAssort HealthLate-stageManaged Agents and Assort Concierge both list voice agent; Cartesia's scale not recorded; ships AI agent and application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareASAI ScreenrUndisclosedManaged Agents and AI Screenr both list voice agent; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareSScreenedUndisclosedManaged Agents and Screened both list voice agent; scale not recorded for either; ships AI agent and application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareSServiceNowPublicManaged Agents and AI Agents both list voice agent; Cartesia's scale not recorded; ships AI agent, application and 2 more rather than the same layer.1 of 3 capabilitiesDifferent layerCompareFAFireworks AILate-stageSonic / Ink and Fireworks Speech Recognition both list speech to text; both also serve buyers who need to turn speech into text; Cartesia's scale not recorded.1 of 3 capabilitiesShared product typeCompareSSona8UndisclosedManaged Agents and Sona8 both list voice agent; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareLALeaping AIUndisclosedManaged Agents and Inbound Voice AI both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareSStepFunLate-stageSonic / Ink and 阶跃星辰 AI Studio (StepFun AI Studio) do comparable work on speech to text and text to speech; both also serve buyers who need to create synthetic voice and audio and turn speech into text; Cartesia's scale not recorded.3 of 3 capabilitiesShared product typeCompareTThoughtlyUndisclosedManaged Agents and Revenue Autopilot both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareEEliseAILate-stageManaged Agents and EliseAI for Healthcare both list voice agent; Cartesia's scale not recorded; ships AI agent and application rather than the same layer.1 of 3 capabilitiesDifferent layerComparePFPocket FMLate-stageSonic / Ink and Sherpa by Pocket FM both list text to speech; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareBBliroUndisclosedManaged Agents and Vicky & Tim both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 3 capabilitiesDifferent layerCompareOOvidaUndisclosedSonic / Ink and Ovida both list speech to text; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareZZendeskLate-stageManaged Agents and Zendesk Contact Center both list voice agent; Cartesia's scale not recorded; ships AI agent, application and 1 more rather than the same layer.1 of 3 capabilitiesDifferent layerCompareRRunwayLate-stageManaged Agents and Runway Characters both list voice agent; Cartesia's scale not recorded; ships AI agent, application and 3 more rather than the same layer.1 of 3 capabilitiesDifferent layerCompareEEvenUpLate-stageManaged Agents and EvenUp Communication Agents both list voice agent; Cartesia's scale not recorded; ships AI agent and application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareXXiao-iPublicManaged Agents and Xiao-i cognitive intelligence platform both list voice agent; Cartesia's scale not recorded; Xiao-i's scale not comparable: only a revenue estimate, no market cap or valuation; ships application and platform rather than the same layer.1 of 3 capabilitiesDifferent layerCompareAAlphabet (Google)PublicSonic / Ink and Cloud Text-to-Speech both list text to speech; both also serve buyers who need to create synthetic voice and audio; Cartesia's scale not recorded.3 of 3 capabilitiesShared product typeCompareLLaxisEarly-stageSonic / Ink and AI Meeting Assistant both list speech to text; both also serve buyers who need to turn speech into text; scale not recorded for either; ships application rather than the same layer.1 of 3 capabilitiesDifferent layerCompareTTencentPublicSonic / Ink and Tencent Cloud TTS both list text to speech; both also serve buyers who need to create synthetic voice and audio; Cartesia's scale not recorded.3 of 3 capabilitiesShared product typeCompareBBolnaEarly-stageManaged Agents and Bolna AI voice agents both list voice agent; scale not recorded for either.1 of 3 capabilitiesShared product typeCompare

Closest alternatives are pairs a vendor page itself compares. Similar products are matched from what each product does; nothing in that group is asserted as a rivalry.

Sources

Stage, from total funding

Company disclosure · 11 Mar 2025 at least

Sum of two rounds Cartesia announced itself, both read 2026-10-09: "our $27M seed round" (cartesia.ai/blog/seed, 2024-12-12) and "our $64 million Series A led by Kleiner Perkins" (this post, 2025-03-11). A floor: no later round was found on the vendor's blog.

Founded

Not found · 20 Sep 2026

No founding year on Cartesia's own pages: /company, /careers, /blog/sonic, /legal/privacy, /legal/terms all read 2026-09-20; a site-scoped search returned no founding statement.

Public listing

Company disclosure · 19 Sep 2026

Self-described as a funded startup; no public filing found.

Description

Company disclosure · 19 Sep 2026

Open Cartesia in the directory

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