AssemblyAI
Speech-to-text and audio intelligence API with industry-leading accuracy
Best for
Best for developers and product teams building transcription or audio intelligence into customer-facing apps and workflows
At a glance
- Pricing
- paidfrom $0.37/mo
- Setup time
- 30 minutes
- Learning curve
- medium
- Last verified
- 5/21/2026
What we love
- ✓Top-tier WER on noisy audio
- ✓Audio-intelligence layer is rare in this category
- ✓Generous free credits to evaluate
Where it falls short
- −No prebuilt end-user UI
- −Costs add up on long audio at scale
- −Regional data residency requires enterprise tier
Pricing
✓ Pricing verified Jun 21, 20263 tiers
Free
one-time
- ✓Async and streaming
- ✓All features
- ✓Community support
Pay-as-you-go
per audio hour async
- ✓Async transcription
- ✓Audio intelligence
- ✓Email support
Enterprise
annual contract
- ✓Volume discount
- ✓SSO
- ✓SLA
- ✓Dedicated CSM
Why we picked it
AssemblyAI's Universal model is one of the few transcription APIs you can drop into production without sweating the WER. The audio-intelligence add-ons remove a whole category of post-processing.
Overview
AssemblyAI is a developer-first speech-to-text API offering high-accuracy transcription, speaker diarization, sentiment analysis, summarization, and an LLM layer that lets you query audio with natural language. It's the go-to for product teams who don't want to fine-tune their own model. Pricing is per-second usage with volume discounts.
Key features
- ●Universal speech model with 90+ languages
- ●Speaker diarization
- ●LeMUR for LLM queries over audio
- ●Sentiment, topic, and entity detection
- ●Real-time streaming transcription
- ●PII redaction
- ●Webhook delivery for async jobs
Best use cases
Meeting and call intelligence
Transcribe, diarize, and summarize meetings or sales calls inside your own app.
Podcast publishing
Auto-transcribe and generate chapter markers and topic tags for podcast episodes.
Integrations
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