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AssemblyAI

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Speech-to-text API with high accuracy transcription

Paid plans only, free trial
Paid Transcription API Tools AI & Automation
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Reviews on G2
126 reviews tracked 3 press mentions

The Bottom Line

Price
Paid plans only, free trial. Compare plans

Key facts

  • AssemblyAI provides AI models for speech-to-text, speaker detection, and audio intelligence
  • It transcribes audio with high accuracy and extracts insights like sentiment and topics
  • Pay-as-you-go from $0.15/hour, with $50 in free credits on signup

Pros

  • Good speech-to-text
  • Speaker diarization
  • Topic detection
  • Good accuracy
  • Fair pricing

Cons

  • Expensive at scale
  • Limited languages
  • Real-time latency
  • API only
  • Enterprise features limited

What is AssemblyAI?

Editorial review
AssemblyAI provides speech-to-text and audio intelligence APIs. Features high-accuracy transcription, speaker diarization, and LLM-powered audio understanding.

Available on: Web

how we evaluate Source assemblyai.com ↗

Ratings Across the Web

4.6 (126 reviews)

AssemblyAI holds an aggregate rating of 4.6 out of 5 from 126 reviews across G2, last checked August 29, 2026.

G2 126 reviews
4.6/5

Ratings aggregated from independent review platforms. Learn more

Key Features

  • Speech-to-text API
  • Audio intelligence
  • Speaker diarization
  • LeMUR LLM integration
  • Streaming transcription
  • HIPAA compliance
  • EU data residency
  • Self-hosted deployment
  • Custom SLAs
  • 55+ languages

Pricing Plans

Free Trial

Pricing checked Oct 10, 2026

AssemblyAI plans and prices, checked October 2026
PlanPriceDetails
Free trial credits

$50 one-time credit

  • $50 in credits on signup, no credit card
  • 5 new streams per minute
  • All models and Audio Intelligence
Pay As You Go

From $0.15/hr

  • Universal-2 pre-recorded $0.15/hr
  • Universal-3.5 Pro pre-recorded $0.21/hr
  • Universal-Streaming $0.15/hr
+2 more
  • Voice Agent API $4.50/hr
  • 100 new streams per minute
Enterprise

Custom

  • Volume pricing
  • Dedicated support
  • Custom rate limits
Calculate your cost View full pricing

Is AssemblyAI worth the price?

Great value

This pricing model is very generous, especially the Free tier offering substantial transcription hours.

The Pay As You Go tier at $0.15 per hour is competitive, providing advanced features and support. It's best for developers and businesses scaling their speech-to-text needs.

Hidden Costs & Gotchas

Overage fees apply beyond free tier limits

Full AssemblyAI pricing: every plan, hidden costs and alternatives

Reviews

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4.6/5

Across 126 verified user reviews on G2

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Still deciding?

Most buyers shortlist 2 or 3 tools before committing. Pull a side-by-side comparison or browse the full alternatives shortlist below.

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AssemblyAI FAQ

How does AssemblyAI handle multiple speakers in an audio file?

AssemblyAI offers speaker diarization, which allows it to identify and separate different speakers within an audio recording. This feature helps in transcribing conversations with multiple participants more clearly. It ensures that each speaker's dialogue is attributed correctly in the transcription.

Which teams would benefit most from using AssemblyAI?

Teams that require high-accuracy speech-to-text transcription and advanced audio intelligence features would find AssemblyAI most beneficial. This includes developers building applications that need to process spoken language, as well as businesses looking to extract insights from audio data. Its API-only nature suits development-focused teams.

How does AssemblyAI compare to Deepgram for speech-to-text accuracy?

AssemblyAI is known for its good speech-to-text accuracy and offers features like speaker diarization and topic detection. While both provide transcription services, AssemblyAI focuses on high-accuracy transcription and LLM-powered audio understanding. Deepgram also provides speech-to-text, but specific comparative accuracy metrics are not provided.

What kind of audio intelligence can AssemblyAI provide beyond basic transcription?

Beyond basic transcription, AssemblyAI offers LLM-powered audio understanding capabilities. This includes features like topic detection, which helps in identifying the main subjects discussed in an audio file. It allows users to extract deeper insights from their audio data.

What are the primary limitations of using AssemblyAI?

AssemblyAI's primary limitations include its cost at scale and a restricted number of supported languages. It is also an API-only product, meaning it requires technical integration, and its enterprise features are considered limited. Additionally, there can be real-time latency concerns.

How is AssemblyAI priced?

AssemblyAI is a paid product and does not offer a permanently free tier. Its pricing model is designed for commercial use, requiring payment for its services. Users should anticipate costs associated with their usage of the API.

Can AssemblyAI identify key topics within transcribed audio?

Yes, AssemblyAI can identify key topics within transcribed audio through its topic detection feature. This capability is part of its LLM-powered audio understanding. It helps users quickly grasp the main subjects discussed in their audio content.

Source: assemblyai.com

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