Sold by: AssemblyAIÂ
Deployed on AWS
Free Trial
AssemblyAI builds AI systems that can understand human speech with superhuman abilities. Starting building with $50 in usage credits during your 90-day free trial. Cancel any time. After your trial ends, you will automatically be enrolled into an Assembly AI pay-as-you-go plan. Request a private offer for discounted pricing based on your usage profile.
Overview
AssemblyAI offers Speech AI models via an API that product teams and developers can use to build powerful AI solutions based on voice data. Thousands of developers build on AssemblyAI's Speech AI models every day to run Speech-to-Text on multilingual speech, and harness the power of Large Language Models to extract the full value from that voice data - including answering questions from voice data, generating content, and extracting metadata in seconds. AssemblyAI offers async transcription, with most audio files completing in well under 45 seconds regardless of audio duration, as well as real-time transcription with high accuracy and <600 ms of latency.
AssemblyAI gives you access to state-of-the-art Speech AI models and capabilities for real-world use cases, so you can build smarter applications in a fraction of the time. Models and features include:
- Speech recognition
- Speaker diarization
- Auto punctuation and casing
- Auto language detection
- Summarization
- Content moderation
- Sentiment analysis
- Auto highlights
- PII redaction
- Topic detection (IAB classification)
- Entity detection
- Auto chapters
- Custom spelling
- Custom vocabulary
- Dual channel transcription
- Export SRT or VTT caption files
- Filler word filtering
- Profanity filtering
In addition, LeMUR, which allows users to leverage the capabilities of Large Language Models, can quickly process audio transcripts for single or multiple audio files for tasks like summarization, question & answer, and AI coaching feedback.
Our Speech AI products support 33 different audio and video file types and 99+ languages. Our models are used by thousands of breakthrough startups and dozens of global enterprises for mission-critical workloads.
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Highlights
- Unparalleled Human-Level Accuracy: Our multilingual speech recognition AI models deliver industry-leading performance with the lowest word error rates on the market, outperforming competitors by over 60% when recognizing challenging content like rare words and proper nouns. Trusted by more than 3,000 innovative companies, including Zoom, our platform provides the foundation for mission-critical speech applications at scale.
- Built for enterprise-grade performance, our APIs deliver unmatched scalability for high-concurrency applications. Security is embedded with SOC 2 Type 2, PCI DSS, and GDPR compliance. For healthcare applications, AssemblyAI offers Business Associate Agreements (BAAs). Choose flexible hosting options in both US and EU regions.
- Comprehensive Audio Intelligence Suite: Our advanced models summarize conversations, identify speakers through diarization, analyze sentiment, moderate content, automatically redact PII, and much more, all in a single platform. Our LeMUR framework seamlessly connects spoken data with large language models, enabling unlimited possibilities for voice-powered applications.
Details
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Delivery method
Deployed on AWS
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Features and programs
Financing for AWS Marketplace purchases
AWS Marketplace now accepts line of credit payments through the PNC Vendor Finance program. This program is available to select AWS customers in the US, excluding NV, NC, ND, TN, & VT.
Pricing
Free trial
Try this product free according to the free trial terms set by the vendor.
Pricing is based on the duration and terms of your contract with the vendor, and additional usage. You pay upfront or in installments according to your contract terms with the vendor. This entitles you to a specified quantity of use for the contract duration. Usage-based pricing is in effect for overages or additional usage not covered in the contract. These charges are applied on top of the contract price. If you choose not to renew or replace your contract before the contract end date, access to your entitlements will expire.
Additional AWS infrastructure costs may apply. Use the AWS Pricing Calculator to estimate your infrastructure costs.
Dimension | Description | Cost/month |
|---|---|---|
Pay As You Go | State-of-the-art production-ready AI models | $0.00 |
Slam_1_STT | Slam-1 speech-to-text (core) | $0.37 |
haiku3_5_input | Claude 3.5 Haiku 1k token input (LeMur) | $0.001 |
haiku3_5_output | Claude 3.5 Haiku 1k token output (LeMur) | $0.004 |
sonnet3_7_input | Claude 3.7 Sonnet 1k token input (LeMur) | $0.003 |
sonnet3_7_output | Claude 3.7 Sonnet 1k token output (LeMur) | $0.015 |
Dimension | Cost/unit |
|---|---|
Async Transcription (core) | $0.37 |
Nano Speech-to-Text (core) | $0.12 |
Real-Time Transcription (core) | $0.47 |
Auto Chapters (Audio Intelligence) | $0.08 |
Content Moderation (Audio Intelligence) | $0.15 |
Entity Detection (Audio Intelligence) | $0.08 |
Key Phrases (Auto Highlights) | $0.01 |
PII Redaction (Audio Intelligence) | $0.08 |
PII Audio Redaction (Audio Intelligence) | $0.05 |
Sentiment Analysis (Audio Intelligence) | $0.02 |
Vendor refund policy
All fees are non-refundable and non-cancellable except as required by law.
Legal
Vendor terms and conditions
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Delivery details
Software as a Service (SaaS)
SaaS delivers cloud-based software applications directly to customers over the internet. You can access these applications through a subscription model. You will pay recurring monthly usage fees through your AWS bill, while AWS handles deployment and infrastructure management, ensuring scalability, reliability, and seamless integration with other AWS services.
Resources
Vendor resources
Support
Vendor support
Support is available via chat and email 24/7. support@assemblyai.comÂ
AWS infrastructure support
AWS Support is a one-on-one, fast-response support channel that is staffed 24x7x365 with experienced and technical support engineers. The service helps customers of all sizes and technical abilities to successfully utilize the products and features provided by Amazon Web Services.
Updated weekly
By AssemblyAI
By Deepgram
By SuccessKPI, Inc
Top
10
In Speech to Text, Customer Support, Speech Recognition
Top
10
In Scheduling & Coordination, Speech Recognition, Sales & Marketing
Top
10
In Quality Assurance, Speech to Text
Sentiment is AI generated from actual customer reviews on AWS and G2
Functionality
Ease of use
Customer service
Cost effectiveness
Positive reviews
Mixed reviews
Negative reviews
AI generated from product descriptions
Speech Recognition
Advanced multilingual speech recognition with high accuracy and low word error rates
Language Processing
Support for 99+ languages with automatic language detection and custom vocabulary capabilities
Audio Intelligence
Comprehensive suite of AI models including speaker diarization, sentiment analysis, content moderation, and PII redaction
Large Language Model Integration
LeMUR framework for processing audio transcripts using advanced language model capabilities
Transcription Flexibility
Support for async and real-time transcription with multiple file type compatibility across 33 audio and video formats
Speech Recognition Speed
Real-time transcription with processing speed of 20x faster than traditional methods, capable of transcribing an hour of audio in approximately 12 seconds
Latency Performance
Ultra-low latency under 300 milliseconds for near-instantaneous speech-to-text conversion
Accuracy Metrics
Speech recognition accuracy exceeding 90% across multiple use case categories
Language Understanding Capabilities
Advanced natural language processing features including summarization, sentiment analysis, speaker diarization, language detection, and translation
Model Customization
Support for customer-specific custom model training to adapt speech recognition for unique business requirements
Analytics Platform
Pure SaaS analytics platform with real-time and historical reporting capabilities for contact centers
AI-Powered Data Processing
Artificial intelligence-driven platform that converts call recordings to text and extracts sentiments, brands, events, and topics
Multi-Platform Integration
Native AWS cloud application with out-of-the-box integration for multiple contact center platforms and data sources
Advanced Speech Analytics
Comprehensive speech and text analytics with capability to blend metadata from IVR, ACD, and CRM systems
Security Compliance
Enterprise-grade security compliance including PCI, SOC II, ISO27001, GDPR, and FedRAMP standards
Validated by AWS Marketplace
FedRAMP
GDPR
HIPAA
ISO/IEC 27001
PCI DSS
SOC 2 Type 2
No security profile
No security profile
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Standard contract
No
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No
Customer reviews
0 ratings
0 AWS reviews
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78 external reviews
Star ratings include only reviews from verified AWS customers. External reviews can also include a star rating, but star ratings from external reviews are not averaged in with the AWS customer star ratings.
Higher Education
Accurate and easy to use
Reviewed on Sep 16, 2025
Review provided by G2
What do you like best about the product?
It provides accurate transcription, even with different accents background noises. Simple to use and many features.
What do you dislike about the product?
sometimes struggles with technical terms. Pricing is also high for some people.
What problems is the product solving and how is that benefiting you?
Helping in learning different accents and making tasks simpler for me.
Scott J.
Accuracy is paramount! AssemblyAI meets that standard.
Reviewed on Sep 01, 2025
Review provided by G2
What do you like best about the product?
The accuracy. It is hands down the best in the industry.
What do you dislike about the product?
I don’t have one complain. It works flawlessly and as described.
What problems is the product solving and how is that benefiting you?
I use a local machine to transcribe speech and match the results with assemblyAI to increase accuracy.
Computer & Network Security
it works great even if you dont say a known real word it works also for plain saying a b c ...
Reviewed on Aug 27, 2025
Review provided by G2
What do you like best about the product?
it works great even if you don't say a known real word, it works also for plain saying a b c ...
so its great for getting modal numbers over a voice call
so its great for getting modal numbers over a voice call
What do you dislike about the product?
the sample code they gave don't await the response so you have to actully keep chcking the status
What problems is the product solving and how is that benefiting you?
searching for keywords over a ivr
Andy S.
My experience with AssemblyAI API
Reviewed on Aug 20, 2025
Review provided by G2
What do you like best about the product?
I’ve found it to be very accurate at speaker identification, handling large length files with very seasonable turnaround times.
What do you dislike about the product?
I haven’t come across anything I dislike as of yet.
What problems is the product solving and how is that benefiting you?
Very quick, cost effective and accurate audio to speaker identified transcriptions.
Max M.
Developer-Friendly and Accurate Transcripts
Reviewed on Aug 18, 2025
Review provided by G2
What do you like best about the product?
Beyond accurate transcripts, AssemblyAI made it easy to determine each call’s outcome, flag unqualified leads, and capture the exact reason a lead wasn’t qualified. Those structured insights rolled up into useful reports and metrics that our team could act on immediately. The whole process felt simple, reliable, and developer-friendly.
What do you dislike about the product?
Using the default analysis was not that great, but once I figured out how to use LeMUR I got exactly what I needed.
What problems is the product solving and how is that benefiting you?
Reviewing call recordings. Doing it manually is a very time consuming process. With Assembly AI I was able to create a process to review call recordings at scale and flag them for specific outcomes.