Duolingo vs Inworld AI

Duolingo — Application · Public · 3 of 3 figures sourced | Inworld AI — Application · Private · Undisclosed · 1 of 1 figure sourced

Relationship

Duolingo English Test and Realtime STT both list speech to text; both also serve buyers who need to turn speech into text; Inworld AI's scale not recorded; ships API service, infrastructure service and 2 more rather than the same layer.

Assembled from the recorded fields for this pair, not hand-checked. The comparison below is read from each company’s own profile.

3 shared capabilitiesDifferent layer

3 shared capabilities — Across all their products, both list speech to text, text generation and voice agent.

Ludbee capability tags · every product each company sells

Different layer — Inworld AI ships API service, infrastructure service and 2 more, not the same layer.

Ludbee product records

Aligned comparison

FieldDuolingoInworld AI

StagePublicUndisclosed

Founded20112021 10 yrs later

StatusPublicPrivate

CategoryApplicationApplication match

Stack layerApplicationAPI service, Infrastructure service, Model API, Platform

HeadquartersPittsburgh, USAMountain View, USA

Capability overlap

Shared · 3

Speech to textText generationVoice agent

Not verified for Inworld AI · 1

Education and tutoring

Recorded for Duolingo. Inworld AI’s product records say nothing either way — a missing record is not a missing capability.

Not verified for Duolingo · 4

Image generationModel inferenceText to speechVideo generation

Recorded for Inworld AI. Duolingo’s product records say nothing either way — a missing record is not a missing capability.

Products, side by side

Algorithmic pairing — assembled from recorded fields, not hand-checked

Duolingo

No shared stack layer with the other side.

Inworld AI

No shared stack layer with the other side.

No counterpart

Duolingo sells these in a stack layer with no product recorded for Inworld AI yet — nothing on the other side to compare them against.

Application

Duolingo English TestApplication

An online English proficiency exam scored by machine learning and accepted by institutions worldwide, with results in two days.

Duolingo MaxApplication

The subscription tier where the AI features live: Video Call with an animated tutor, Roleplay conversations and Explain My Answer, sitting on top of everything Super already removes from the free course.

Inworld AI sells these in a stack layer with no product recorded for Duolingo yet — nothing on the other side to compare them against.

API service

Realtime APIAPI service

Speech-to-speech voice-agent API in which one WebSocket session runs Inworld speech recognition with voice profiling, a chosen LLM from 100+ with tool calling and turn detection, and Realtime TTS-2 voice output.

Realtime STTAPI service

Speech-to-text API (Inworld STT-1) that transcribes streaming or complete audio in 30+ languages with turn detection, returning voice-profile signals for emotion, vocal style, accent, age and pitch alongside the transcript.

Realtime TTSAPI service

Text-to-speech API (Realtime TTS-2 and TTS-2 Flash) with voice cloning and voice design, billed per million characters.

Platform

Realtime RouterPlatform

OpenAI-compatible LLM gateway that sends each request to one of 100+ models from OpenAI, Anthropic, Google and others by rules on user attributes, context, A/B splits or cost, with failover and provider rates passed through at zero markup.

Infrastructure service

Inworld ComputeInfrastructure service

Dedicated NVIDIA B200 GPUs for high-volume realtime workloads such as LLM inference, dedicated TTS serving and custom model hosting, with Kubernetes access or Inworld-managed deployment, and deployed models routable through Inworld Router.

Model API

Inworld InferenceModel API

Inworld Inference provides API access to text, image, video and decision models.