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View detailsAssemblyAI
An AI API for speech-to-text with speaker labels, summaries, and content moderation.
AssemblyAI is an AI API for speech-to-text with speaker labels, summaries, and content moderation. Developers send audio to the API and get back a transcript with diarization, sentiment analysis, entity detection, and summaries, all in one call. It is built for apps that need more than raw text from their audio.
Key Features
- Speech-to-text API with high accuracy
- Speaker diarization and summaries
- Sentiment analysis and entity detection
- Content moderation built in
- Pay-as-you-go by the audio hour
- 99 languages supported
Pricing
| Plan | Price | Details |
|---|---|---|
| Free Credit | $0 | $50 in free credits, no card required; covers up to 333 hours of Universal-2. |
| Universal-2 | $0.15/hr | Pre-recorded transcription, billed per audio hour. |
| Universal-3.5 Pro | $0.21/hr | Higher-accuracy pre-recorded transcription, billed per audio hour. |
Prices as listed in 2026 research. Always check the official site for the latest price — plans change. Free plan: Yes — it has a free plan.
Best for: developers who need accurate speech-to-text with speaker labels, summaries, and moderation.
Popular with: Developers, Business Owners
Popular with: Developers, Business Owners
How it works
Pricing is pay-as-you-go by the audio hour: the Universal-2 model costs $0.15 an hour and Universal-3.5 Pro costs $0.21 an hour for pre-recorded audio, with streaming from $0.15 an hour. A $50 free credit lets you transcribe hundreds of hours before paying, with no credit card required.
AssemblyAI is a strong choice for developers building transcription into a product, a call analytics tool, or a content moderation pipeline. The API is well documented and the models are accurate across 99 languages. If you just need a transcript of one file, a consumer tool is simpler, but for building on top of speech AI, AssemblyAI is one of the best APIs available.
Pros and Cons
✓ Pros
- Generous $50 free credit
- Very low per-hour pricing
- Rich features: diarization, summaries, moderation
- Well-documented API
✗ Cons
- Developer-focused; no simple consumer app
- Free tier is a one-time credit, not a permanent plan
- Add-ons like diarization cost extra
Frequently Asked Questions
Is AssemblyAI free?
Yes — AssemblyAI has a free plan. Free $50 credit; from $0.15/hr
What is AssemblyAI best for?
developers who need accurate speech-to-text with speaker labels, summaries, and moderation.
What kind of tool is AssemblyAI?
AssemblyAI is a Transcription tool on VerlumoAI.
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View detailsLast reviewed: November 2026