tools
AssemblyAI
AssemblyAI provides APIs for transcribing, understanding, and building applications with spoken audio.
AssemblyAI offers speech-to-text APIs for recorded and realtime audio, plus speaker diarization, language detection, prompting, sentiment analysis, entity detection, summaries, redaction, and other speech-understanding features.
Developers use it for voice agents, meeting notetakers, call analytics, medical documentation, dictation, and contact-center tools. It is an API platform rather than a consumer transcription app; usage is billed based on audio processed or tokens used, with some features costing extra.
Features
- Transcribe recorded audio and video with Universal-3.5 Pro or Universal-2
- Transcribe live audio with realtime speech-to-text APIs
- Detect and label multiple speakers with speaker diarization
- Improve recognition with keyterms prompting and natural-language prompting
- Extract sentiment, entities, topics, translations, and summaries
- Apply PII redaction, profanity filtering, and content moderation
- Route transcripts to multiple language models through LLM Gateway
- Run voice agents through a single WebSocket API
Use cases
- Build realtime voice agents for customer support and sales
- Transcribe meetings and generate summaries, chapters, and action items
- Analyze customer calls for sentiment, topics, entities, and compliance
- Create ambient medical documentation and AI scribe workflows
- Add formatted speech input to dictation features
- Provide live coaching and compliance alerts to contact-center agents
Pros
Cons
Pricing
- Starting price
- $0.15 /hr
- Pricing checked
- 2026-09-19
Free
Free
- Up to 185 hours of pre-recorded transcription
- Up to 333 hours of streaming transcription
- No credit card required
Pay as you go
$0.15 /hr
- Universal-2 pre-recorded speech-to-text
- Pay for actual usage
- Volume discounts available
Custom
Custom
- Custom rate limits
- Enhanced concurrency
- Enterprise-grade flexibility