Sold by: AssemblyAIÂ
Deployed on AWS
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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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Deployed on AWS
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Financing for AWS Marketplace purchases
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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
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Delivery details
Software as a Service (SaaS)
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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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85 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.
Gal D.
Accurate, fast and developer friendly
Reviewed on Oct 09, 2025
Review provided by G2
What do you like best about the product?
The documentation is great, and the WER is best in class. The integration was so smooth as it's compatible with all popular vendors
What do you dislike about the product?
The platform itself isn't mature, has no team management, and no basic features for organizations
What problems is the product solving and how is that benefiting you?
The WER for live vidoes generation
Higher Education
Great product. Great fidelity.
Reviewed on Oct 01, 2025
Review provided by G2
What do you like best about the product?
It is remarkably accurate, even if the audio quality (as assessed by this researcher) is below what might be expected.
What do you dislike about the product?
The diarization feature sometimes fails.
What problems is the product solving and how is that benefiting you?
Transcripts of academic lectures.
Hospital & Health Care
Very good
Reviewed on Sep 29, 2025
Review provided by G2
What do you like best about the product?
The configuration was easy to implement. The French accuracy is pretty good. The time to transcribe is very fast.
What do you dislike about the product?
Sometimes, French accuracy has some issues. Same for the speakers detection.
What problems is the product solving and how is that benefiting you?
Assembly help me to transcribe
Richard V.
Powerful, Developer-Friendly STT with Room to Evolve
Reviewed on Sep 24, 2025
Review provided by G2
What do you like best about the product?
* The accuracy is excellent, even on noisy audio or with multiple speakers. Many of the transcripts required minimal editing.
* Speaker diarisation works reliably — being able to split out who said what is a big plus in multi-person recordings.
* Ease of integration is a standout: the API is well documented, the onboarding is smooth, and I got up and running quickly.
* The pricing model is fair and transparent — you pay for usage rather than being locked into a subscription.
* Advanced features like Word Boost / keyword prompting, PII redaction, and language auto-detection give useful flexibility for real-world use cases.
* Speaker diarisation works reliably — being able to split out who said what is a big plus in multi-person recordings.
* Ease of integration is a standout: the API is well documented, the onboarding is smooth, and I got up and running quickly.
* The pricing model is fair and transparent — you pay for usage rather than being locked into a subscription.
* Advanced features like Word Boost / keyword prompting, PII redaction, and language auto-detection give useful flexibility for real-world use cases.
What do you dislike about the product?
* The latency/response times can vary under load, which makes it less predictable for real-time needs.
* Customisation is somewhat limited: fine-tuning for domain-specific vocabulary or acoustic quirks isn’t as deep as one might hope.
* The API returns many fields in the response; for simpler workflows, that extra metadata can add overhead.
* The 10-hour audio length limit (for some endpoints) feels restrictive for very long recordings.
* In certain regions (e.g. Europe), some features are either missing or still in development.
* Customisation is somewhat limited: fine-tuning for domain-specific vocabulary or acoustic quirks isn’t as deep as one might hope.
* The API returns many fields in the response; for simpler workflows, that extra metadata can add overhead.
* The 10-hour audio length limit (for some endpoints) feels restrictive for very long recordings.
* In certain regions (e.g. Europe), some features are either missing or still in development.
What problems is the product solving and how is that benefiting you?
We're using it as part of our new app "Think Notes". We're integrating AssemblyAI to transcribe and analyse recordings and meetings. We hope it will be the main powerhouse behind our new app.
Kunal K.
Review of Assembly AI software
Reviewed on Sep 24, 2025
Review provided by G2
What do you like best about the product?
AssemblyAI offers highly accurate speech recognition, easy-to-use APIs, and powerful features like summarization and sentiment analysis.
What do you dislike about the product?
Some advanced features can be costly at scale, and real-time transcription may have slight delays depending on network conditions
What problems is the product solving and how is that benefiting you?
AssemblyAI solves the challenge of manual transcription by providing accurate, automated speech-to-text, saving time, reducing costs, and improving accessibility.