AssemblyAI
APIs for converting audio to text and building voice-driven applications with real-time and recorded processing
- Also known as
- assemblyai
Available worldwide · Popular in: US, GB
What is AssemblyAI?
A platform providing speech-to-text APIs for both pre-recorded and live audio, voice agent capabilities, and audio analysis features like speaker identification and sentiment analysis. Serves millions of developers with focus on accuracy and scalability.
AssemblyAI pricing
Plans, per-tier features and add-ons, dated and linked to live pricing. Pricing changes often; always verify at source before you rely on it.
From $0.37/hour for async transcription. Free tier available.
Async Speech-to-Text
Pre-recorded audio transcription
Real-time Speech-to-Text
Live audio stream transcription
Sync Speech-to-Text
Same-request transcription for short clips
Add-ons
- Speaker Diarization$0.12 per hour
- LLM Prompting$0.05 per hour
- Voice Isolation$0.10 per hour
- SSO$199/mo
Platform & deployment
Independently observed- Web
- Cloud / SaaS
Integrations (5)
Independently observed- Semantic Kernel .NET
- Vercel AI SDK
- OpenAI GPT-5.6 Luna
- OpenAI GPT-5.6 Terra
- Google Gemini
AssemblyAI alternatives
Other speech to text we track, ranked by the same independent score.
- SpeechmaticsMultilingual speech-to-text and text-to-speech APIs deployable in cloud, on-premises, or on-device environmentsmedium · 55%
- whisper.cpplow · 24%
- DeepgramConversation-aware voice AI for transcription and synthesis at scalelow · 43%
- Amazon TranscribeAutomatic speech recognition service that converts spoken audio into written textlow · 34%
- faster-whisperlow · 28%
- Vosklow · 28%
Compare AssemblyAI
Side by side against other speech to text, attribute by attribute, with a source on every value.
The Vioscale score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for AssemblyAI, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Pricing transparency | 100 | 0.08 | 8.4 | ✓ |
| Reliability | 95 | 0.07 | 6.9 | ✓ |
| Security posture | 75 | 0.07 | 5.5 | ✓ |
| Price level | 80 | 0.05 | 4.2 | ✓ |
| Integrations | 22 | 0.04 | 0.9 | ✓ |
| Capabilities | 0 | 0.05 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.