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AssemblyAI

Speech-to-text and voice agent APIs priced by the hour, with a large free tier.

4.4(35 reviews)MatchFast editorial rating, not a verified user review average.

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Price
From $0.15/hr; free credits
Founded
Not available
HQ
Not available
Employees
Not available

About AssemblyAI

AssemblyAI sells speech APIs to developers rather than a finished app. New accounts get 185 hours of pre-recorded and 333 hours of streaming transcription without a card. Add-ons such as key phrases, topic detection and medical mode bill separately, from a penny to fifteen cents an hour, and there is no minimum commitment.

Key platforms

Core service areas

Pre-recorded speech-to-text

From $0.15 per hour

Realtime streaming

English and multilingual options

Voice Agent API

Speech, LLM and TTS in one call

Dictation API

Finished text from one utterance

Add-ons

Key phrases, topic detection, medical mode

Free tier

Hundreds of hours without a card

Pros and cons

Pros

  • Transparent per-hour pricing with no minimum commitment
  • Generous free tier of 185 hours pre-recorded, 333 streaming
  • 99 languages on Universal-2
  • Voice Agent API bundles speech, LLM and TTS at $4.50/hr

Cons

  • Requires engineering work; there is no ready-made app
  • Add-on features bill separately on top of the base rate

Frequently asked questions

01
How much does AssemblyAI cost?
Pre-recorded transcription from $0.15/hr, realtime from $0.15/hr, Voice Agent API at $4.50/hr. Q: Is there a free tier? A: Yes, 185 hours pre-recorded and 333 hours streaming with no credit card. Q: What are good alternatives to AssemblyAI? A: Good Tape and MeetGeek for finished apps.

Best for

Developers adding transcription or voice agents to their own product.

Pricing details

Pay-as-you-go. Universal-2 $0.15/hr (99 languages). Universal-3.5 Pro $0.21/hr. Universal-3.6 Pro Realtime $0.45/hr. Universal-Streaming $0.15/hr. Sync API $0.45/hr. Voice Agent API $4.50/hr. Dictation API $0.62/hr. Add-ons $0.01-$0.15/hr. Free tier: 185 hours pre-recorded, 333 hours streaming. Details: https://www.assemblyai.com/pricing

Review notes

  • Last reviewed

    October 4, 2026

  • Source

    assemblyai.com

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