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AssemblyAI

Speech-to-text and voice-agent APIs that transcribe audio and pull structured insights from speech

Toolora score87Free tier

Free tier

OpenAI Whisper

Robust speech recognition you can run anywhere

Toolora score93Open source

Free / open source

Deepgram

Speech-to-text, text-to-speech, and a voice-agent API for live conversations, in the cloud or self-hosted

Toolora score87Free

Free trial

SpecAssemblyAIOpenAI WhisperDeepgram
CategoryAI ToolsAI ToolsAI Tools
PricingFree tier + paid usage by audio hourFree / open sourceFree trial + paid usage; Flux TTS promo windows
Toolora score87/10093/10087/100
Best forspeech, transcription, voice, apigithub, speech, transcription, audiospeech, stt, tts, voice-agents
Top features
  • ·Speech-to-text
  • ·Real-time streaming
  • ·Voice Agent API
  • ·Multilingual ASR
  • ·Speech translation to English
  • ·Multiple model sizes
  • ·Speech-to-text
  • ·Text-to-speech
  • ·Voice Agent API