Speech & Transcription EnginesfreemiumLimited free

AssemblyAI

Speech-to-text with audio intelligence

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Limited free tier

Free access is one-time sign-up credit, then pay-as-you-go. Need it free right now? Try ElevenLabs Scribe →

What AssemblyAI does

  • Speech-to-text with audio intelligence
  • Summaries, topics and sentiment
  • Speaker diarization
  • Free tier for developers

AssemblyAI — straight answers

What is AssemblyAI?

AssemblyAI is listed under Speech & Transcription Engines, in the AI Models & Local Execution category on Flocci AI Tools. Speech-to-text with audio intelligence. It is freemium — a usable free tier with paid plans above it, and it lives at assemblyai.com.

Is AssemblyAI free?

Partly. Free access is one-time sign-up credit, then pay-as-you-go. If you need it free right now, ElevenLabs Scribe does the same job for free.

Can I use AssemblyAI in a browser, or is there an app?

AssemblyAI works in a normal browser tab with no install. It is available on the web and an API.

What can AssemblyAI do?

AssemblyAI does 4 things the catalog singles out: Speech-to-text with audio intelligence; summaries, topics and sentiment; speaker diarization; free tier for developers.

What is the best free alternative to AssemblyAI?

ElevenLabs Scribe is the best free alternative: it does the same job and you can start without paying. NVIDIA Canary-Qwen 2.5B, NVIDIA Parakeet and sherpa-onnx also start free. The full list is on the alternatives page.

See the full list →

AssemblyAI alternatives

Compare all alternatives →

OpenAI Whisper

Speech & Transcription Engines
free
  • Open-source speech-to-text, run locally free
  • 99+ languages and translation
  • Robust to accents and noise
  • Powers countless apps
Visit

Deepgram

Speech & Transcription Engines
freemium
  • Fast, accurate speech-to-text API
  • Real-time streaming and diarization
  • Voice-agent building blocks
  • Free credits to start
Visit

NVIDIA Parakeet

Speech & Transcription Engines
free
  • Tops the Hugging Face Open ASR Leaderboard with 6.05% average WER at 0.6B params
  • CC-BY-4.0 license, free for commercial and non-commercial use
  • RTFx ~3,386 — extremely fast inference relative to accuracy
Visit

Mistral Voxtral

Speech & Transcription Engines
freemium
  • Apache 2.0 open-weight models (24B and 3B) downloadable from Hugging Face
  • Built-in Q&A/summarization over audio, not just raw transcription
  • Function-calling directly from voice input for agent workflows
Visit

Speechmatics

Speech & Transcription Engines
freemium
  • Free starting credit with no card required, 56+ language support
  • Model-training discount program cuts costs 33% for data-sharing customers
  • On-premises/VPC deployment for privacy-sensitive enterprise use
Visit

Soniox

Speech & Transcription Engines
freemium
  • Real-time speech-to-text priced well under typical competitor rates
  • Combines transcription + translation in one streaming API call
  • Diarization and speech translation bundled at no extra cost
Visit

Head-to-head comparisons

AssemblyAI vs OpenAI WhisperAssemblyAI vs DeepgramAssemblyAI vs NVIDIA ParakeetAssemblyAI vs Mistral VoxtralAssemblyAI vs SpeechmaticsAssemblyAI vs Soniox