Inworld AI

Inworld AI provides production-grade voice AI APIs ranked #1 on the Artificial Analysis Speech Arena, offering realtime text-to-speech, speech-to-speech, speech-to-text, and intelligent LLM routing. The platform delivers sub-130ms first-chunk latency and supports over 100 languages, making it suitable for companions, agentic workforces, learning platforms, health and wellness apps, and interactive media. Developers access all capabilities through a unified API with SOC2 Type II, HIPAA, and GDPR compliance built in.

• Realtime TTS — Top-ranked text-to-speech with sub-130ms latency, starting at $15/1M characters; supports voice cloning from 15 seconds of audio, text-based voice design, advanced inline voice direction, and cross-lingual output in 100+ languages.
• Realtime Speech-to-Speech API — End-to-end full-duplex audio streaming over WebSocket or WebRTC with custom voices, tool calling, intelligent turn detection, and dynamic context management mid-session.
• Realtime STT — Speech-to-text with real-time voice profiling (emotion, age, accent, pitch, style), semantic and acoustic VAD, word-level timestamps, speaker diarization, and custom vocabulary support.
• Realtime LLM Router — Single API that routes requests across OpenAI, Anthropic, Google, xAI, Groq, Mistral, and 200+ models with built-in failover, A/B testing, user-aware and context-aware routing, and no added latency.
• Voice Cloning & Design — Clone a voice from 15 seconds of audio or describe a voice in natural language to generate a production-ready custom voice without recording.
• Advanced Voice Direction — Add bracketed instructions anywhere in text to adjust tone, speed, volume, vocal style, and pauses in real time.
• Enterprise Security — SOC2 Type II certified, HIPAA compliant, GDPR compliant; optional zero data retention, on-prem deployment, and EU/India data residency available.
• Credit-Based Billing — Monthly credits usable across TTS, STT, and LLMs; higher tiers unlock volume discounts up to 40% off standard rates.