AssemblyAI

The best way to build Voice AI apps with one robust API

★★★★★ 4.8/5 from 25 reviews

What is AssemblyAI?

Build new AI products with voice data leveraging AssemblyAI’s industry-leading Voice AI models for accurate speech-to-text, speaker detection, sentiment analysis, PII redaction, streaming speech recognition and more.

Join 5,000+ industry-leading companies, including Fireflies.ai, Glean, and Calabrio, unlocking the power of voice data and launching best-in-class products and experiences.

Pros & Cons

Pros

  • Accurate transcription
  • Transcription API
  • Easy integration
  • Fast performance
  • Sentiment analysis
  • Excellent documentation
  • Content moderation
  • Multilingual support
  • Real-time transcription
  • Speaker diarization
  • Auto chapters
  • Developer experience
  • Rich audio features
  • Scalable APIs

Cons

  • Autopay issues
  • No card removal option
  • Occasional transcription errors

Tool Details

Categories AI Infrastructure Tools, Transcription
Website assemblyai.com
Became Popular August 4, 2017
Platforms Web
Social

Recent Reviews (8)

B
bnkd Mar 14, 2025
★★★★★

When selecting a speech-to-text & audio intelligence provider for NeuraVid.io, we compared several options, including Deepgram, Rev AI, AWS Transcribe, and Whisper-based APIs. We ultimately chose AssemblyAI because of the following key advantages: superior transcription quality, multilingual & the best speaker diariaztion that we tested

Accurate transcription Multilingual support Speaker diarization
S
Susan May 9, 2025
★★★★★

What sets AssemblyAI apart is its simplicity and seamless integration for transforming speech into meaningful text. Their API is easy to implement, providing highly accurate and fast transcription with industry-leading accuracy, while also offering features like sentiment analysis and content moderation out of the box.

Fast performance Easy integration Accurate transcription Sentiment analysis Transcription API Content moderation
S
Susan Feb 27, 2025
★★★★★

What sets AssemblyAI apart is its simplicity and seamless integration for transforming speech into meaningful text. Their API is easy to implement, providing highly accurate and fast transcription with industry-leading accuracy, while also offering features like sentiment analysis and content moderation out of the box.

Fast performance Easy integration Accurate transcription Sentiment analysis Transcription API Content moderation
J
Jay Jul 9, 2025
★★★★★

AssemblyAI isn’t just a transcription engine—it’s a full-fledged audio intelligence platform. With top-tier accuracy, rich audio features, real-time capabilities, scalable APIs, and rapid innovation, it's an incredible asset for anyone working with voice/video data. If you're a developer, podcaster, researcher, or enterprise looking to build or analyze audio at scale, AssemblyAI is absolutely worth exploring.

Accurate transcription Real-time transcription Rich audio features Scalable APIs
L
Luca Aug 27, 2025
★★★★☆

Tried it via API, the product does his job wonderfully. Maybe a small note regarding the fierce competition in the field is needed, 11Labs is still the elephant in the room

Accurate transcription Transcription API
X
Xbei Dec 26, 2024
★★★★★

The precision was impressive, yet it was the comprehensive documentation and distinctive features such as Auto Chapters and Sentiment Analysis that truly swayed us.

Excellent documentation Accurate transcription Sentiment analysis Auto chapters
R
Rob Jan 18, 2024
★★☆☆☆

No option to remove card and I had to contact sales which wasted 20 mins to turn off autopay. A bit dishonest by assemblyai.

No card removal option Autopay issues
A
Aurelie Dec 9, 2022
★★★★☆

Just tested the API with Make, excellent documentation and high-quality results

Excellent documentation

Frequently Asked Questions about AssemblyAI

When did AssemblyAI become popular?

AssemblyAI became popular around August 4, 2017.

What are the main advantages of using AssemblyAI?

The top advantages of AssemblyAI include: accurate transcription, transcription API, easy integration, fast performance, sentiment analysis.

What are the disadvantages of AssemblyAI?

Some reported disadvantages of AssemblyAI include: autopay issues, no card removal option, occasional transcription errors.

What is AssemblyAI's overall user rating?

AssemblyAI has an overall rating of 4.8/5 based on 25 user reviews.

What type of tool is AssemblyAI?

AssemblyAI belongs to the following categories: AI Infrastructure Tools, Transcription.

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