Sold by: AssemblyAI
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
Features and programs
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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)
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.com
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.
Customer reviews
Francesco M.
Using AssemblyAI to get podcast episodes transcripts
Reviewed on May 20, 2025
Review provided by G2
What do you like best about the product?
I use AssemblyAI to get transcripts of my podcast episodes, and the accuracy is pretty good.
The timestamp associated with each word allow us to easily make a connection with the podcast audio and jump right where we need.
Customer support has been great.
The timestamp associated with each word allow us to easily make a connection with the podcast audio and jump right where we need.
Customer support has been great.
What do you dislike about the product?
Nothing to complain.
Sometimes it's a bit tricky when the podcaster say the spelling of the promo code he uses.
For example, if the promocode is SUMMER. I may get S-U-M-M-E-R, which is not easy to work with. But I it's an edge case.
Sometimes it's a bit tricky when the podcaster say the spelling of the promo code he uses.
For example, if the promocode is SUMMER. I may get S-U-M-M-E-R, which is not easy to work with. But I it's an edge case.
What problems is the product solving and how is that benefiting you?
Get the podcast episodes transcript, associating each word with a timestamp.
Give lot of insight to what podcasters are saying and how are promoting our promo codes
Give lot of insight to what podcasters are saying and how are promoting our promo codes
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Timur M.
a great solution to build into your product
Reviewed on May 20, 2025
Review provided by G2
What do you like best about the product?
We recently started using the AssaemblyAI api to transcribe videos from our educational channels. The API works quickly and reliably. So far we have never encountered any limitations of the platform, although our videos are quite large. The quality of recognition is very high, the price is about the same as with OpenAI analogs, but there is no limit of 25 minutes per video fragment.
What do you dislike about the product?
I wish the price was even lower, we have so many more videos to process. Also it is not quite clear how formatting into paragraphs works, according to the api we get exactly the text without paragraphs, although in the version available for free through the interface, the recognized text is already formatted
What problems is the product solving and how is that benefiting you?
We are using the AssaemblyAI api to transcribe videos from our educational channels to build RAG system
Professional Training & Coaching
AssemblyAI does a good job with transcription
Reviewed on May 19, 2025
Review provided by G2
What do you like best about the product?
I am a college professor and used the AssemblyAI speech-to-text API for a qualitative research project. I had hundreds of interviews in a non-English language that needed to be transcribed. AssemblyAI solved my problem fairly easily. It cost me a lot less than what I anticipated. The transcriptions were very accurate and included the special characters in that language.
There are plenty of videos and sources for those who are new to AssemblyAI.
I could not be happier.
There are plenty of videos and sources for those who are new to AssemblyAI.
I could not be happier.
What do you dislike about the product?
I did not have anything specific that I disliked about AssemblyAI.
What problems is the product solving and how is that benefiting you?
AssemblyAI transcribes audio files fairly easily. As a researcher that uses interviews as data, it makes my job a lot easier.
Research
Easy to use speech to text solution
Reviewed on May 19, 2025
Review provided by G2
What do you like best about the product?
Their documentation was very easy to work with. I was able to hit the ground running within minutes.
What do you dislike about the product?
Faster transcription would be appreciated.
What problems is the product solving and how is that benefiting you?
Transcribing meeting transcripts that we’ll later to capture insights.
Rodrigo F.
Best Speech-to-Text Service Overall
Reviewed on May 19, 2025
Review provided by G2
What do you like best about the product?
AssemblyAI is seriously impressive. Before I found it, I tried out Google Cloud, Whisper, and some open-source tools for diarization. I even gave Read.ai a shot, but honestly, none of them gave me the results I was looking for.
Then I saw someone mention AssemblyAI on Reddit, and I decided to give it a try. I’m so glad I did—their transcription and diarization are on another level. I barely ever need to edit the transcripts, which is rare with these kinds of tools.
The pricing is super reasonable for what you get, and the API is really flexible. I’ve been able to build my own workflows to transcribe meetings, interviews, and videos without any hassle. I use it pretty much every day for transcribing meetings I record on my computer, and I save everything in Markdown format.
If you’re looking for a solid, reliable transcription service that just works, I can’t recommend AssemblyAI enough.
Then I saw someone mention AssemblyAI on Reddit, and I decided to give it a try. I’m so glad I did—their transcription and diarization are on another level. I barely ever need to edit the transcripts, which is rare with these kinds of tools.
The pricing is super reasonable for what you get, and the API is really flexible. I’ve been able to build my own workflows to transcribe meetings, interviews, and videos without any hassle. I use it pretty much every day for transcribing meetings I record on my computer, and I save everything in Markdown format.
If you’re looking for a solid, reliable transcription service that just works, I can’t recommend AssemblyAI enough.
What do you dislike about the product?
It's not that I don't like but I think there is high bareer for non-techs to access the serviece. I know tht they ahve a playground, but it's still scary for peop,e who want to use the service but see the. Some friends who see my workflow wants to mimic but stop when they see the api nterface. The docs are very well detailed, but there are barreres for adoption for certain customer segments still.
Another thing that I would like would to store the cluster of voicers that are recorded I would like the odel to automatically name them. I think this would be too complicated and probably there's privacy concerns involved. But it would be a quality of life approach. But I guess this is a niche need instead of something the custoemr base would be interested at
Another thing that I would like would to store the cluster of voicers that are recorded I would like the odel to automatically name them. I think this would be too complicated and probably there's privacy concerns involved. But it would be a quality of life approach. But I guess this is a niche need instead of something the custoemr base would be interested at
What problems is the product solving and how is that benefiting you?
AssemblyAI is solving the problem of turning audio into accurate, structured text—especially with speaker diarization and high transcription quality. It saves me a huge amount of time. I use it to transcribe meetings, interviews, and video content recorded locally on my computer, and the results are so good I rarely need to edit them. Having access to a reliable API also means I can fully automate my workflow and store the transcripts in Markdown, exactly the way I need. It’s made transcription effortless and consistent, which is a big deal for someone who works with audio content daily.