Build engaging companions & social apps

Pick from hundreds of library voices, clone a voice from seconds of audio, or design one from a text prompt. Steering tags like [laughing] and [whispering] bring your experience to life across 100+ languages.

Use Inworld STT across 30+ languages to capture speech, detect turn-taking, and return voice signals like emotion, pace, pitch, and vocal style, each with confidence scores. When a user is tired, anxious, or excited, the companion's reply can match, softer, faster, leaning in, without wiring it by hand.

Use the Inworld Realtime API for low-latency, speech-to-speech conversations. One realtime session handles listening, semantic turn detection, barge-in interruptions, and spoken responses. Users can trail off, interrupt, and banter naturally, with instant replies.

Route each conversation by metadata: plan, region, mode, or custom fields. Free tiers stay on fast, cheap models, while paying users get premium models. A/B test personalities and measure retention, not just latency. With automatic fallback across 200+ models, a conversation never dies with a provider outage.

Your user's conversations remain theirs. Inworld supports zero-data-retention configurations, on-prem deployment on your own GPUs, and enterprise-grade security, so your users can be themselves without worrying about privacy.

We understand consumer app economics and are committed to providing the highest quality models and inference for the lowest possible price. Whether it's TTS, STT, or LLMs, you will never get better price-performance elsewhere. And with our Inference service, you can access consumer-optimized open models for up to 50% lower than public third-party rates.