Build delightful learning experiences

Use Inworld TTS for tutor replies, lesson narration, vocabulary cards, stories, pronunciation examples, and more. Stream speech with word and character timestamps for highlighting, visemes for avatar lipsync, and voice settings for stable narration or more expressive tutoring. Cross-lingual localization keeps one voice consistent across every language you teach, while voice cloning and design allows for custom voices for each use-case.

Use Inworld STT across 30+ languages to capture learner speech, detect turn-taking, and return voice signals like accent, pace, pitch, age, vocal style, and emotion. Those signals can drive pronunciation feedback, adaptive difficulty, confidence scoring, and different flows for kids, adults, frustrated learners, or advanced speakers.

Use the Inworld Realtime API for low-latency, speech-to-speech learning sessions. One realtime session handles listening, semantic turn detection, barge-in interruptions, and spoken responses, so learners can pause to think, interrupt naturally, and get an answer instantly.

Route learners to the right model by metadata: plan, region, proficiency, lesson type, or custom fields. Free users can use cheaper models, premium users can use stronger reasoning, and graded feedback can route to a mid-tier model. A/B test teaching styles and measure completion, not just latency. With automatic fallback across 200+ models, so a lesson never ends due to a provider outage.

Inworld partners with k-ID so teams can build educational experiences with an age-aware safety harness underneath. Use jurisdiction-tuned age gates, verifiable parental consent, and per-market defaults for retention, profiling, AI training, and family controls. Pair k-ID's CDK with Inworld ZDR options and enterprise controls to support COPPA-compliant workflows without locking younger learners out of useful AI.

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.