AssemblyAI / assemblyai.com
Developer speech recognition and audio intelligence API with transcription, speaker diarisation, sentiment analysis, topic detection, content safety, and LLM reasoning on audio via the LeMUR feature.
Free plan
Yes
API access
Yes
Open source
No
Platforms
5
AssemblyAI differentiates from pure transcription services by packaging speech recognition with a suite of audio intelligence features — sentiment analysis, entity detection, topic detection, content safety, and LeMUR for applying LLM reasoning directly to audio — in a single API call.
This all-in-one approach reduces the services needed for voice-enabled applications, podcast analysis, call centre analytics, and media processing. The Universal-2 model achieves strong accuracy across diverse audio conditions including phone calls. The generous $50 free credit drives strong developer adoption across podcast tools, interview processing, and meeting analytics applications.
AssemblyAI runs as speech-to-text software built around audio and text workflows. Users typically start with a prompt, upload, or connected data source, and the underlying model handles the heavy lifting before returning a result you can refine or export. It's available on web, python, and node.js, with API access for teams that want to embed it into their own products.
Recent YouTube videos cached from the backend so this page stays fast and fresh.
The capabilities that matter most for teams evaluating AssemblyAI.
Applies LLM reasoning to audio for Q&A, summarisation, and data extraction without manual transcript handling.
Sentiment analysis, entity detection, topic detection, and content safety applied to audio in the transcription pipeline.
High-accuracy model across diverse audio conditions including lower-quality phone and conference recordings.
Free $50 credit for new accounts. Best model $0.37/hr. Nano $0.12/hr. Real-time streaming $0.30/hr. Enterprise custom pricing.
Model
Usage-based
Starting price
Free
Free trial
No
Deepgram is faster for real-time streaming. Rev.ai focuses on enterprise batch processing. Whisper provides free self-hosted transcription.
A side-by-side look at the closest alternative in this category.
Key facts about model providers, platforms, and team support.
Model Provider
AssemblyAI
Models
Universal-2
Platforms
Web, Python, Node.js, Ruby, Go SDKs
Deployment
SaaS, API
Integrations
Python, Node.js, Go, Ruby, REST API, Webhooks
Team Collaboration
No
Launch Year
2017
Compliance signals and data-handling notes as reported by the vendor.
SOC 2 Type II. GDPR compliant. HIPAA eligible with BAA. Data deleted after processing by default.
Review AssemblyAI's data handling policy. Audio data processed on AssemblyAI's infrastructure and deleted by default after processing.
Editorial Verdict
AssemblyAI is the best choice for developers wanting transcription plus audio intelligence in a single API. For pure low-latency real-time transcription, Deepgram is faster.
Last verified July 24, 2026.
Free $50 credit for new accounts. Best model $0.37/hr. Nano $0.12/hr. Real-time streaming $0.30/hr. Enterprise custom pricing.
Free trial with 300 minutes of transcription. Usage-based at $0.02/minute for async transcription. $0.021/minute for streaming. Custom enterprise pricing.
SOC 2 Type II. GDPR compliant. HIPAA eligible with BAA. Data deleted after processing by default.
Enterprise includes HIPAA Business Associate Agreements. SOC 2 Type II certified. GDPR compliant.
Review AssemblyAI's data handling policy. Audio data processed on AssemblyAI's infrastructure and deleted by default after processing.
Review Rev.ai's data handling policy. Audio submitted for transcription is processed by Rev.ai's infrastructure. Enterprise includes BAA for HIPAA compliance.
Verified reviews from signed-in users, stored in the backend and averaged into this tool's rating.
Sign in to rate AssemblyAI and leave a review.
No other reviews yet — be the first to share how this tool performs in practice.
