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
No
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.
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.
Darko D.
Great, cost effective solution
Reviewed on Aug 11, 2025
Review provided by G2
What do you like best about the product?
How easy it is to setup. And how insanely accurate it actually is. We've integrated it into our internal product with almost a click of a button.
What do you dislike about the product?
There is nothing that we dislike. It is easy and super intuitive product that matches our exact needs.
What problems is the product solving and how is that benefiting you?
Coaching our SDR team.
Austin V.
Accurate and Cheap!
Reviewed on Aug 06, 2025
Review provided by G2
What do you like best about the product?
Assembly AI is hands down the fastest, cheapest, and most accurate transcription service I've used. The word-level timestamps are very precise.
What do you dislike about the product?
For my use cases, I would love to see the speed of transcription improve to less than 5 seconds per hour of content.
What problems is the product solving and how is that benefiting you?
Transcribing podcasts at the time of playback.
Sarmad W.
AssemblyAI STT: Simple, Affordable, but Not Without Tradeoffs
Reviewed on Aug 04, 2025
Review provided by G2
What do you like best about the product?
AssemblyAI was honestly a breeze to work with. What stood out most for me:
✅ Ridiculously easy to use – The API is straightforward and well-documented. I was up and running in minutes without needing to dig into edge-case docs.
🔧 Effortless integration – Plugged it right into our existing STT pipeline with minimal changes. It felt like it was designed to just fit in.
💸 Cost-effective – It gave us solid transcription quality at a much lower price point compared to other providers, which made it a no-brainer from a budgeting standpoint.
✅ Ridiculously easy to use – The API is straightforward and well-documented. I was up and running in minutes without needing to dig into edge-case docs.
🔧 Effortless integration – Plugged it right into our existing STT pipeline with minimal changes. It felt like it was designed to just fit in.
💸 Cost-effective – It gave us solid transcription quality at a much lower price point compared to other providers, which made it a no-brainer from a budgeting standpoint.
What do you dislike about the product?
While AssemblyAI overall delivered solid value, there were a couple of areas that fell short for us:
🕒 Inconsistent response times – We noticed variability in transcription latency, especially during higher-load windows. This made it tricky to rely on for real-time-ish workflows.
⚙️ Limited customization – The API didn’t offer much flexibility in tailoring the model to domain-specific vocab or acoustic quirks. If you're working in a niche industry or need fine-tuned accuracy, you're boxed in a bit.
🕒 Inconsistent response times – We noticed variability in transcription latency, especially during higher-load windows. This made it tricky to rely on for real-time-ish workflows.
⚙️ Limited customization – The API didn’t offer much flexibility in tailoring the model to domain-specific vocab or acoustic quirks. If you're working in a niche industry or need fine-tuned accuracy, you're boxed in a bit.
What problems is the product solving and how is that benefiting you?
What Problems Is AssemblyAI Solving & How It Benefits Us
We’re leveraging AssemblyAI to automate transcription of all our cold calls, and it’s solving a very specific but critical pain point:
📞 Manual note-taking is dead – No more wasting time jotting down call summaries or missing important details. Every conversation is accurately logged.
🧠Instant access to customer insights – Having clean, searchable transcripts helps our sales and marketing teams quickly analyze conversations, spot objections, and refine messaging.
🔄 Improved workflow automation – Transcriptions feed into our CRM and internal tools, enabling follow-ups, QA, and even training analysis without human bottlenecks.
The real win? Time savings, better visibility, and a more scalable cold-calling process.
We’re leveraging AssemblyAI to automate transcription of all our cold calls, and it’s solving a very specific but critical pain point:
📞 Manual note-taking is dead – No more wasting time jotting down call summaries or missing important details. Every conversation is accurately logged.
🧠Instant access to customer insights – Having clean, searchable transcripts helps our sales and marketing teams quickly analyze conversations, spot objections, and refine messaging.
🔄 Improved workflow automation – Transcriptions feed into our CRM and internal tools, enabling follow-ups, QA, and even training analysis without human bottlenecks.
The real win? Time savings, better visibility, and a more scalable cold-calling process.