Deepgram
Real-time speech-to-text API with sub-300ms latency
Verdict
Fastest production ASR API — under 300ms latency for real-time use. Nova-2 model rivals Whisper quality. Best for live transcription, call centres, and real-time applications.
Other Speech & Audio
- AssemblyAIProduction
Transcription API with built-in audio intelligence features
- BarkStable
Open-source TTS model with emotions, music, and sound effects
- Coqui TTSExperimental
Open-source TTS toolkit for training and deploying custom voices
- ElevenLabsProduction
Best-in-class text-to-speech with voice cloning and dubbing
- Kokoro TTSExperimental
Lightweight 82M-parameter open-source text-to-speech model
- OpenAI TTSProduction
OpenAI's simple API for high-quality speech synthesis