What is AssemblyAI?
Speech-to-text and voice agent APIs for developers.
Who is AssemblyAI best for?
AssemblyAI is best for developers adding transcription, call analytics or voice agents to their product.
Meeting notes and AI notetakers
Pre-recorded transcription with speaker labels, speaker names and chapter summaries turns recordings into notes through one API.
Phone and web voice agents
The Voice Agent API bundles speech recognition, a conversation model, voices and hosting into one hourly rate, and plugs into your own Twilio account.
Call analytics
Sentiment, topic and entity detection plus PII redaction run on call recordings for a few cents per hour of audio each.
Products used in many languages
Universal-2 covers 99 languages, and Universal-3.5 Pro handles speakers who switch between languages in the same recording.
How much does AssemblyAI cost?
AssemblyAI is pay as you go: new accounts get $50 in free credits, then transcription costs from $0.15 an hour of audio and the Voice Agent API $4.50 an hour, with no subscription or minimum spend.
- $50 in credits that do not expire, no credit card needed
- Up to 185 hours of pre-recorded or 333 hours of streaming transcription
- Does not cover the LLM Gateway
- Universal-2: $0.15 an hour, 99 languages
- Universal-3.5 Pro: $0.21 an hour, 18 languages
- Speaker labels add $0.02 an hour
- Universal-Streaming: $0.15 an hour, English only
- Universal-Streaming Multilingual: $0.15 an hour, 6 languages
- Universal-3.5 Pro Realtime: $0.45 an hour, 18 languages
- Speech recognition, conversation model and voices in one rate
- Hosting, turn detection and call recordings included
- Billed per second of connected time
The Sync Speech-to-Text API costs $0.45 an hour and the Dictation API $0.62 an hour. Speech Understanding add-ons are billed per hour of audio, for example translation at $0.06, speaker names from $0.02 and summaries from $0.02, and the LLM Gateway charges per million tokens by model. You top up a prepaid balance with no minimums or contracts; multichannel audio is billed per channel. Sales offers custom plans with volume discounts. Full pricing on assemblyai.com. We checked these prices on .
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What are the best AssemblyAI alternatives?
Three tools on Recaply do AssemblyAI's job.
Questions about AssemblyAI
What is AssemblyAI?
Speech-to-text and voice agent APIs for developers.
Who is AssemblyAI for?
AssemblyAI is best for developers adding transcription, call analytics or voice agents to their product.
Is AssemblyAI free?
AssemblyAI gives new accounts $50 in free credits with no credit card, enough for up to 185 hours of pre-recorded or 333 hours of streaming transcription. The credits do not expire, but once they are used up you pay per hour from a prepaid balance.
How much does AssemblyAI cost?
AssemblyAI's paid plans are Pre-recorded Speech-to-Text at From $0.15 per hour of audio, Realtime Speech-to-Text at From $0.15 per hour and Voice Agent API at $4.50 per hour ($0.075 a minute).
What are the best AssemblyAI alternatives?
The closest alternatives on Recaply are Rev AI, Speechmatics and Whisper API.
Where can I try AssemblyAI?
On its official website, assemblyai.com.
How does AssemblyAI bill realtime transcription?
AssemblyAI bills realtime transcription and voice agent sessions for the whole time the connection stays open, not only the seconds of speech. A stream left open closes after 3 hours and is billed for all 3, so your app should end each session when it is done.
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