RA

Retell AI

Sells a platform for building, deploying and running AI voice agents that answer and place phone calls for businesses, billed per minute of call time, and chat agents for websites, SMS and a chat API, billed per message.

Supplied by: Cartesia

StageUndisclosed

Founded2023

HeadquartersRedwood City, USA

StatusPrivate

Products

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

• Retell AI Voice Agents Agent platform Sold on its own

  Platform for building, deploying and monitoring AI voice agents that handle phone calls: call transfer to humans, appointment booking, IVR navigation, outbound call campaigns and post-call analysis.

• Retell Chat Agents Agent platform Sold on its own

  Text counterpart of Retell's voice agents: businesses build AI chat agents with the same prompts, functions and knowledge bases, or convert a voice agent in one click, and deploy them in a website widget, over two-way SMS or through a chat API, billed per AI message.

Inside Retell AI

• Retell AI Conductor Agent platform Included with the parent

  AI copilot on every page of the Retell dashboard: told in plain language what to change, it proposes edits to a voice or chat agent for approval, generates simulation tests from real calls, filters call and chat history to explain failures, and builds analytics charts.

Closest alternatives 5

SSynthflowEarly-stageRetell AI's own comparison page positions Retell's voice agents against Synthflow for running phone conversations.3 of 4 capabilitiesShared product typeSourced competitorHandle customer support conversationsCompareBABland AIEarly-stageRetell AI's own comparison page positions Retell's voice agents against Bland AI for running phone conversations.3 of 4 capabilitiesShared product typeSourced competitorHandle customer support conversationsCompareDDecagonLate-stageRetell AI's own comparison page positions Retell's voice agents against Decagon for customer support conversations.4 of 4 capabilitiesShared product typeSourced competitorHandle customer support conversationsCompareSSierraLate-stageRetell AI's own comparison page positions Retell's voice agents against Sierra for customer support conversations.4 of 4 capabilitiesDifferent layerSourced competitorHandle customer support conversationsCompareVVapiEarly-stageRetell AI's own comparison page positions Retell's voice agents against Vapi for building phone agents.3 of 4 capabilitiesShared product typeSourced competitorBuild and run AI agentsCompare

Similar products 86

How this list is ranked ↗

PPolyAIUndisclosedRetell AI Voice Agents and Dialog Studio do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; scale not recorded for either.4 of 4 capabilitiesShared product typeCompareKKore.aiLate-stageRetell AI Conductor and Arch AI both serve buyers who need to test and evaluate an AI agent; scale not recorded for either.4 of 4 capabilitiesShared product typeCompareCCrescendoEarly-stageRetell AI Conductor and Optimization Agent both serve buyers who need to test and evaluate an AI agent; Retell AI's scale not recorded.4 of 4 capabilitiesShared product typeCompareSASoundHound AIPublicRetell AI Voice Agents and OASYS do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.3 of 4 capabilitiesShared product typeCompareAAdaUndisclosedRetell Chat Agents and Ada Computer both list customer support; both also serve buyers who need to handle customer support conversations; scale not recorded for either.2 of 4 capabilitiesShared product typeComparePParloaLate-stageRetell AI Conductor and Parloa Performance Lab both serve buyers who need to test and evaluate an AI agent; Retell AI's scale not recorded.4 of 4 capabilitiesShared product typeCompareHHaptikAcquiredRetell Chat Agents and Contakt both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; Haptik is acquired, with no independent scale.4 of 4 capabilitiesShared product typeCompareCCognigyAcquiredRetell AI Voice Agents and Cognigy.AI do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; Cognigy is acquired, with no independent scale.4 of 4 capabilitiesShared product typeCompareHAHippocratic AILate-stageRetell AI Conductor and AI Certified Agent Builder both serve buyers who need to test and evaluate an AI agent; Retell AI's scale not recorded.4 of 4 capabilitiesShared product typeCompareYYellow.aiUndisclosedRetell AI Voice Agents and Yellow.ai Agentic AI Platform do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; scale not recorded for either.4 of 4 capabilitiesShared product typeCompareZZendeskLate-stageRetell Chat Agents and AI Agents both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships AI agent and application rather than the same layer.4 of 4 capabilitiesDifferent layerCompareTTwilioPublicRetell AI Voice Agents and Twilio Agent Connect do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships API service, application and 3 more rather than the same layer.3 of 4 capabilitiesDifferent layerCompareLLivePersonAcquiredRetell AI Voice Agents and Conversational Cloud do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; LivePerson is acquired, with no independent scale.3 of 4 capabilitiesShared product typeCompareFFive9PublicRetell Chat Agents and Five9 IVA Studio both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.2 of 4 capabilitiesShared product typeCompareFForethoughtAcquiredRetell Chat Agents and Forethought both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; Forethought is acquired, with no independent scale.3 of 4 capabilitiesShared product typeCompareEeGainPublicRetell AI Voice Agents and eGain AI Agent do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; scale not recorded for either.4 of 4 capabilitiesShared product typeCompareGGenesysUndisclosedRetell Chat Agents and Genesys Cloud AI Studio both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; Genesys's scale not comparable: only a revenue estimate, no market cap or valuation.3 of 4 capabilitiesShared product typeCompareSSalesforcePublicRetell AI Voice Agents and Agentforce Voice do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.3 of 4 capabilitiesShared product typeCompareEElevenLabsLate-stageRetell AI Voice Agents and ElevenLabs Agents do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.2 of 4 capabilitiesShared product typeCompareNNiCEPublicRetell Chat Agents and AI Agents for Process Automation both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.4 of 4 capabilitiesShared product typeCompareAAiseraAcquiredRetell Chat Agents and Aisera AI Agent Platform both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; Aisera is acquired, with no independent scale.2 of 4 capabilitiesShared product typeCompareSServiceNowPublicRetell AI Voice Agents and AI Agents do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships AI agent, application and 2 more rather than the same layer.4 of 4 capabilitiesDifferent layerCompareCCrestaLate-stageRetell AI Voice Agents and Cresta AI Agent do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships AI agent and application rather than the same layer.4 of 4 capabilitiesDifferent layerCompareOOraclePublicRetell AI Voice Agents and Oracle Digital Assistant do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.3 of 4 capabilitiesShared product typeCompareFFinAcquiredRetell AI Voice Agents and Fin Voice do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; Fin is acquired, with no independent scale; ships AI agent, API service and 2 more rather than the same layer.3 of 4 capabilitiesDifferent layerCompareFFreshworksPublicRetell Chat Agents and Freddy AI Agent Studio both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.2 of 4 capabilitiesShared product typeCompareAAmazonPublicRetell AI Voice Agents and Amazon Lex do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.4 of 4 capabilitiesShared product typeCompareRRasaEarly-stageRetell AI Voice Agents and Rasa Platform do comparable work on customer support and voice agent; scale not recorded for either.3 of 4 capabilitiesShared product typeCompareIIBMPublicRetell AI Voice Agents and IBM Watson Assistant do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.4 of 4 capabilitiesShared product typeCompareHHubSpotPublicRetell Chat Agents and Agent Hub both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.2 of 4 capabilitiesShared product typeCompareAAtlassianPublicRetell Chat Agents and Service Request Helper both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.3 of 4 capabilitiesShared product typeCompareKKlaviyoPublicRetell Chat Agents and Klaviyo Customer Agent both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships AI agent and application rather than the same layer.1 of 4 capabilitiesDifferent layerCompareVSVerint SystemsAcquiredRetell Chat Agents and Verint Da Vinci AI and Bots both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; Verint Systems is acquired, with no independent scale.3 of 4 capabilitiesShared product typeCompareMMicrosoftPublicRetell Chat Agents and Microsoft Copilot Studio both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.3 of 4 capabilitiesShared product typeCompareXXiao-iPublicRetell AI Voice Agents and Xiao-i cognitive intelligence platform do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI'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.2 of 4 capabilitiesDifferent layerCompareEEntrataUndisclosedRetell Chat Agents and ELI Call Analysis both list customer support; both also serve buyers who need to handle customer support conversations; scale not recorded for either.2 of 4 capabilitiesShared product typeCompareAHAssort HealthLate-stageRetell Chat Agents and Assort Empower both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships AI agent and application rather than the same layer.2 of 4 capabilitiesDifferent layerCompareMmonday.comPublicRetell Chat Agents and monday service both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships application and platform rather than the same layer.2 of 4 capabilitiesDifferent layerCompareEEliseAILate-stageRetell AI Voice Agents and Contact Center do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships AI agent and application rather than the same layer.2 of 4 capabilitiesDifferent layerCompareKKrispUndisclosedRetell Chat Agents and Krisp Call Center AI both list customer support; both also serve buyers who need to handle customer support conversations; scale not recorded for either; ships application and developer tool rather than the same layer.1 of 4 capabilitiesDifferent layerCompareKHK HealthLate-stageRetell AI Voice Agents and PatientGPT both list customer support; both also serve buyers who need to handle customer support conversations; scale not recorded for either; ships application rather than the same layer.1 of 4 capabilitiesDifferent layerCompareFLFunnel LeasingUndisclosedRetell AI Voice Agents and Fenix do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; scale not recorded for either; ships AI agent, application and 1 more rather than the same layer.3 of 4 capabilitiesDifferent layerCompareCConversicaUndisclosedRetell Chat Agents and Conversica AI Agents both list customer support; both also serve buyers who need to handle customer support conversations; scale not recorded for either; ships AI agent rather than the same layer.1 of 4 capabilitiesDifferent layerComparePPegasystemsPublicRetell AI Voice Agents and Pega Knowledge Agent both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.2 of 4 capabilitiesShared product typeCompareZZoomPublicRetell Chat Agents and Zoom Workforce Management both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships AI agent, API service and 2 more rather than the same layer.4 of 4 capabilitiesDifferent layerCompareRARelevance AIEarly-stageRetell AI Conductor and Invent both serve buyers who need to test and evaluate an AI agent; scale not recorded for either.3 of 4 capabilitiesShared product typeCompareAAdobePublicRetell Chat Agents and Adobe Brand Concierge both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships AI agent, API service and 2 more rather than the same layer.2 of 4 capabilitiesDifferent layerCompareCClayLate-stageRetell AI Conductor and Claygent Builder both serve buyers who need to test and evaluate an AI agent; Retell AI's scale not recorded.2 of 4 capabilitiesShared product typeCompareAAlphabet (Google)PublicRetell Chat Agents and Customer Experience Agent Studio both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.4 of 4 capabilitiesShared product typeCompareYYandexPublicRetell Chat Agents and Yandex SpeechSense both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships API service, application and 2 more rather than the same layer.3 of 4 capabilitiesDifferent layerCompareCCiscoPublicRetell AI Voice Agents and Webex AI Agent do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships AI agent, application and 1 more rather than the same layer.4 of 4 capabilitiesDifferent layerCompareRRunwayLate-stageRetell AI Conductor and Runway Offline Policy Evaluation both serve buyers who need to test and evaluate an AI agent; Retell AI's scale not recorded; ships AI agent, application and 3 more rather than the same layer.2 of 4 capabilitiesDifferent layerCompareAAlvariaUndisclosedRetell Chat Agents and Alvaria Intelligence Platform (AIP) both list customer support; scale not recorded for either; ships platform rather than the same layer.1 of 4 capabilitiesDifferent layerCompareRRibbonEarly-stageRetell AI Voice Agents and Ribbon API both list voice agent; scale not recorded for either; ships AI agent and API service rather than the same layer.1 of 4 capabilitiesDifferent layerCompareCCerencePublicRetell AI Voice Agents and Mobile Work Agent both list voice agent; Retell AI's scale not recorded; ships AI agent, application and 2 more rather than the same layer.3 of 4 capabilitiesDifferent layerCompareIAInworld AIUndisclosedRetell AI Voice Agents and Realtime API both list voice agent; scale not recorded for either; ships API service, infrastructure service and 2 more rather than the same layer.1 of 4 capabilitiesDifferent layerCompareRRespeecherEarly-stageRetell AI Voice Agents and Respeecher Space both list voice agent; scale not recorded for either; ships API service and application rather than the same layer.1 of 4 capabilitiesDifferent layerCompareLLListen LabsLate-stageRetell AI Voice Agents and Listen both list voice agent; scale not recorded for either; ships application rather than the same layer.1 of 4 capabilitiesDifferent layerCompareFRFurhat RoboticsUndisclosedRetell AI Voice Agents and FurhatAI both list voice agent; scale not recorded for either; ships platform and robot rather than the same layer.1 of 4 capabilitiesDifferent layerCompareMPMeta PlatformsPublicRetell Chat Agents and Meta Business Agent both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.2 of 4 capabilitiesShared product typeCompareCCoveoPublicRetell Chat Agents and Coveo Case Assist both list customer support; both also serve buyers who need to handle customer support conversations; scale not recorded for either; ships API service, application and 2 more rather than the same layer.2 of 4 capabilitiesDifferent layerCompareVVectaraEarly-stageRetell Chat Agents and Customer Support Managed Agent both list customer support; both also serve buyers who need to handle customer support conversations; scale not recorded for either.3 of 4 capabilitiesShared product typeCompareASAI ScreenrUndisclosedRetell AI Voice Agents and AI Screenr both list voice agent; scale not recorded for either; ships application rather than the same layer.1 of 4 capabilitiesDifferent layerCompareSScreenedUndisclosedRetell AI Voice Agents and Screened both list voice agent; scale not recorded for either; ships AI agent and application rather than the same layer.1 of 4 capabilitiesDifferent layerCompareUUniphoreLate-stageRetell AI Voice Agents and Self-Service Agent do comparable work on customer support and voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships application, data service and 1 more rather than the same layer.3 of 4 capabilitiesDifferent layerCompareSSpeakLate-stageRetell AI Voice Agents and Speak for Business both list voice agent; Retell AI's scale not recorded; ships application rather than the same layer.1 of 4 capabilitiesDifferent layerCompareTTencentPublicRetell Chat Agents and Tencent Cloud Agent Development Platform both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded.2 of 4 capabilitiesShared product typeCompareSCSpanish ChatUndisclosedRetell AI Voice Agents and Maya both list voice agent; scale not recorded for either; ships application rather than the same layer.1 of 4 capabilitiesDifferent layerCompareAApplePublicRetell AI Voice Agents and Siri AI both list voice agent; Retell AI's scale not recorded; ships application and developer tool rather than the same layer.1 of 4 capabilitiesDifferent layerCompareDDuolingoPublicRetell AI Voice Agents and Duolingo Max both list voice agent; Retell AI's scale not recorded; ships application rather than the same layer.1 of 4 capabilitiesDifferent layerCompareMMakiUndisclosedRetell AI Voice Agents and Mochi both list voice agent; scale not recorded for either; ships AI agent rather than the same layer.1 of 4 capabilitiesDifferent layerCompareEEvenUpLate-stageRetell AI Voice Agents and EvenUp Communication Agents both list voice agent; Retell AI's scale not recorded; ships AI agent and application rather than the same layer.1 of 4 capabilitiesDifferent layerCompareTATalkio AIUndisclosedRetell AI Voice Agents and Talkio AI both list voice agent; scale not recorded for either; ships application rather than the same layer.1 of 4 capabilitiesDifferent layerCompareAAlexEarly-stageRetell AI Voice Agents and AI Interviewer both list voice agent; scale not recorded for either; ships AI agent and application rather than the same layer.1 of 4 capabilitiesDifferent layerCompareBBrightHireEarly-stageRetell AI Voice Agents and BrightHire Screen both list voice agent; scale not recorded for either; ships AI agent, application and 1 more rather than the same layer.1 of 4 capabilitiesDifferent layerCompareWWixPublicRetell Chat Agents and Wix Smart Chat both list customer support; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships AI agent and application rather than the same layer.2 of 4 capabilitiesDifferent layerCompareHHarnessLate-stageRetell AI Conductor and AI Evals both serve buyers who need to test and evaluate an AI agent; scale not recorded for either.2 of 4 capabilitiesShared product typeCompareHAHume AIUndisclosedRetell AI Conductor and User Testing API both serve buyers who need to test and evaluate an AI agent; scale not recorded for either; ships API service, application and 3 more rather than the same layer.2 of 4 capabilitiesDifferent layerCompareNCNAVER CloudUndisclosedRetell Chat Agents and CLOVA Chatbot both list customer support; both also serve buyers who need to handle customer support conversations; scale not recorded for either; ships API service, application and 1 more rather than the same layer.2 of 4 capabilitiesDifferent layerCompareRRingCentralPublicRetell AI Voice Agents and AI Receptionist both list voice agent; both also serve buyers who need to handle customer support conversations; Retell AI's scale not recorded; ships AI agent, application and 1 more rather than the same layer.1 of 4 capabilitiesDifferent layerCompareLLangChainLate-stageRetell AI Conductor and LangSmith Chat both serve buyers who need to test and evaluate an AI agent; scale not recorded for either.2 of 4 capabilitiesShared product typeCompareMMicro1UndisclosedRetell AI Conductor and Cortex both serve buyers who need to test and evaluate an AI agent; scale not recorded for either; ships data service rather than the same layer.1 of 4 capabilitiesDifferent layerCompareDDeepgramLate-stageRetell AI Voice Agents and Deepgram Voice Agent API both list voice agent; Retell AI's scale not recorded; ships API service rather than the same layer.2 of 4 capabilitiesDifferent layerCompareCCartesiaEarly-stageCartesia's customer story says Retell AI added Cartesia as a primary voice provider for its voice agents.1 of 4 capabilitiesShared product typeSupplierCompareHCHuawei CloudUndisclosedRetell Chat Agents and Question Answering Bot (QABot) both list customer support; both also serve buyers who need to handle customer support conversations; scale not recorded for either; ships API service, application and 4 more rather than the same layer.1 of 4 capabilitiesDifferent layerCompareMMastraEarly-stageRetell AI Conductor and Mastra Studio both serve buyers who need to test and evaluate an AI agent; scale not recorded for either.2 of 4 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

Total funding

Not found · 7 Oct 2026

Read https://www.retellai.com/about-us, /newsroom, the homepage and the Y Combinator profile. The About page states only a "$4.6M seed round, backed by Alt Capital" (May 2024); no cumulative funding total is stated on any Retell page, so none is recorded.

Valuation

Not found · 7 Oct 2026

No valuation is stated on https://www.retellai.com/about-us, /newsroom, the homepage or the Y Combinator profile.

Founded

Company disclosure · 7 Oct 2026

Company's own Y Combinator profile: "Founded: 2023", Winter 2024 cohort. Its About page (https://www.retellai.com/about-us) dates its Y Combinator acceptance to November 2023.

Public listing

Company disclosure · 7 Oct 2026

Private company: Terms of Service name Retell AI Inc.; its About page states a seed round backed by Alt Capital; no public filing found.

Description

Company disclosure · 7 Oct 2026

Homepage: "Build, deploy, and manage next-generation AI voice agents that sound human, execute tasks, and scale effortlessly."

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