The best voice, speech & video for AI agents

Speech-to-text and audio-intelligence API — transcription, diarization, summarization, and LLM-over-audio (LeMUR). Best for agent builders.

Sonic — ultra-low-latency (~90ms), emotive real-time text-to-speech and voice cloning for live voice agents. Best for agent builders.

Talking-avatar video API — turn a photo + text/audio into a lip-synced presenter, with real-time WebRTC streaming agents. Best for agent builders.

Fast, accurate speech-to-text, text-to-speech, and voice-agent APIs built for real-time and batch at scale. Best for agent builders.

Ultra-realistic text-to-speech, voice cloning, dubbing, and voice-agent APIs for developers and creators. Best for agent builders.

OpenAudio (S1/S2) text-to-speech and voice cloning — open models plus a hosted pay-as-you-go API. Best for agent builders.

Audio-infrastructure API for voice products — async and real-time speech-to-text with diarization and translation. Best for agent builders.

Programmatic AI avatar video generation and video translation/dubbing with lip-sync, via a REST API. Best for agent builders.

Empathic Voice Interface (EVI) and Octave TTS — emotionally intelligent, context-aware expressive speech. Best for agent builders.

Low-latency (150–200ms) multilingual text-to-speech with studio-quality voices and instant cloning. Best for agent builders.

Generative text-to-speech API with 900+ voices, instant voice cloning, and low-latency streaming for conversational AI. Best for agent builders.

Voice cloning and generative speech API, plus deepfake detection and audio watermarking, billed per second. Best for agent builders.

Voice-agent API for AI phone calls — build, test, and deploy production call agents with usage-based per-minute pricing. Best for agent builders.

Enterprise TTS with 200+ realistic voices, sub-200ms latency, and linguistically-aware markup for voice agents. Best for agent builders.

High-accuracy speech-to-text across 55+ languages, plus real-time transcription and the Flow voice-agent API. Best for agent builders.

Studio-grade AI lip-sync and visual dubbing API — retime any video's mouth to new audio in any language. Best for agent builders.

Studio-grade AI avatar video generation API — script-to-video with 200+ avatars, translation, and templates. Best for agent builders.

Conversational Video Interface (CVI) and Phoenix replica API — real-time, face-to-face AI video agents ('digital twins'). Best for agent builders.

Developer-first platform to build, test, and deploy real-time voice AI agents with pluggable STT/LLM/TTS and telephony. Best for agent builders.