Sold by: AssemblyAI
Deployed on AWS
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 AssemblyAI pay-as-you-go plan. Request a private offer for discounted pricing based on your usage profile.
4.3
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 two of the world's most powerful and accurate async transcription models, as well as real-time transcription with ultra high accuracy, low latency, and built-in turn detection.
AssemblyAI gives you access to state-of-the-art Speech AI models and capabilities for real-world use cases with unlimited concurrency and no upfront contract commitment, so you can build smarter applications in a fraction of the time. Models and features include:
- Speech recognition
- Keyterms prompting for streaming
- Auto language detection
- Translation
- Speaker diarization and identification
- Auto punctuation and casing
- Custom formatting
- Custom spelling
- Custom vocabulary
- Guardrails, including Content Moderation, PII Redaction, and Profanity Filtering
- Filler word filtering
- Summarization
- Sentiment analysis
- Auto highlights
- Topic detection (IAB classification)
- Entity detection
- Auto chapters
- Dual channel transcription
- Export SRT or VTT caption files
In addition, LLM Gateway allows you to connect speech-to-text outputs directly to your preferred leading LLM provider through a single, unified API for tasks like output fine-tuning, 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.
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 Speech Understanding Suite and Guardrails: 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 LLM Gateway seamlessly connects spoken data with your preferred large language models, enabling unlimited possibilities for voice-powered applications in one unified platform.
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Deployed on AWS
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Pricing
Pricing is based on actual usage, with charges varying according to how much you consume. Subscriptions have no end date and may be canceled any time.
Additional AWS infrastructure costs may apply. Use the AWS Pricing Calculator to estimate your infrastructure costs.
Dimension | Description | Cost/unit |
|---|---|---|
Universal-2 | Fast, intelligent async transcription with exceptional accuracy and unlimited concurrency | $0.15 |
SLAM-1 (deprecated) | Highest accuracy transcription powered by LLM intelligence | $0.27 |
Universal Streaming | Fast, accurate real-time transcription. Built-in turn detection and unlimited concurrency | $0.15 |
Keyterms Prompting (Universal Streaming) | Improve recognition accuracy for specific words and phrases | $0.04 |
Speaker Identification | Identify speakers by their actual names and roles | $0.02 |
Translation | Automatically convert your transcribed audio content from one language to another | $0.06 |
Custom Formatting | Ensure consistency through automatic, standardized formatting | $0.03 |
Entity Detection | Identify entities like person and company names, email addresses, dates, and locations | $0.08 |
Sentiment Analysis | Detect the sentiment of each sentence of speech spoken in your audio files | $0.02 |
Auto Chapters | Automatically generate a summary over time for audio and video files | $0.08 |
Vendor refund policy
All fees are non-refundable and non-cancellable except as required by law.
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Support
Vendor support
Support is available 24/7 via chat on our website at <www.assemblyai.com > or email at support@assemblyai.com .
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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.
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Customer reviews
Ekpono A.
Real-Time Live Translation That Brings Apps to Life
Reviewed on Jul 28, 2026
Review provided by G2
What do you like best about the product?
The real-time live translation feature made the app I built come alive. It added an immediate, dynamic feel that really improved the overall experience.
What do you dislike about the product?
The documentation didn’t include many sample apps to guide me through, so I had to figure a lot of things out on my own.
What problems is the product solving and how is that benefiting you?
This is a transcription API for documents and speech-to-text, and I use it for conversations.
Marketing and Advertising
Highly Accurate Transcriptions with Flexible Audio Processing Options
Reviewed on Jul 28, 2026
Review provided by G2
What do you like best about the product?
What I like best about the software is its transcription accuracy and the multiple options available to me when processing my audio.
What do you dislike about the product?
The only thing I disliked about my experience: while on the free plan with provided credits to test out the platform, I was unaware that submitted content was being used to train their system. The ability to opt out is only once you've moved to a paid plan.
What problems is the product solving and how is that benefiting you?
I like how they've set up their UI for their playground. It allows you to quickly test different scenarios before you implement them in your integrations, which we have done in n8n.
It has performed better than other AI transcription tools, as far as accuracy, but also in feature set, like being able to export word-level timestamps in JSON format.
So getting set up and going with the app has been frictionless.
It has performed better than other AI transcription tools, as far as accuracy, but also in feature set, like being able to export word-level timestamps in JSON format.
So getting set up and going with the app has been frictionless.
LOKESH G.
Fast, Accurate Transcription with Clear Docs and Powerful Built-In Features
Reviewed on Jul 27, 2026
Review provided by G2
What do you like best about the product?
AssemblyAI is easy to use and delivers fast, accurate speech-to-text transcription. The API documentation is clear and thorough, making it straightforward to integrate smoothly into applications. I also appreciate the useful built-in features, such as speaker identification, summarisation, and sentiment analysis.
What do you dislike about the product?
Transcription accuracy can occasionally drop when the audio includes strong accents or a lot of background noise. Processing larger files may also take longer, and the pricing can become expensive if you need high-volume usage.
What problems is the product solving and how is that benefiting you?
AssemblyAI automates speech-to-text transcription and audio analysis, removing the need for manual transcription. This saves time and boosts productivity, while also making it easier to search, summarise, and analyse audio content from meetings, interviews, and customer conversations.
Muzammil M.
AssemblyAI Makes Transcription Fast with Clear, Easy-to-Use API Docs
Reviewed on Jul 21, 2026
Review provided by G2
What do you like best about the product?
I started using AssemblyAI when I needed a quick way to convert recorded audio into text for notes and content planning. The API documentation is easy to follow, and testing the transcription service didn't take much time. The transcripts were clear enough for me to review and edit instead of typing everything manually, which made the whole process faster.
What do you dislike about the product?
For most recordings the results are good, but audio with background noise or multiple speakers sometimes needs a quick manual review. The free credits are useful for testing, although they can be used up fairly quickly if you're processing several files.
What problems is the product solving and how is that benefiting you?
AssemblyAI helps me turn audio into searchable text without spending time typing everything myself. I use it when I need to extract information from recordings or prepare written notes. It speeds up the workflow, makes important points easier to find later, and saves time compared to manual transcription.
Shashank Suraj
Accurate transcripts and fast translations have reduced my interview processing time
Reviewed on Jul 15, 2026
Review provided by PeerSpot
What is our primary use case?
The main use case of AssemblyAI is for transcription purposes. Whenever I work on a file, specifically when I moderate or take an interview, I need to have a transcript. I mostly use AssemblyAI to make my proper transcript.
I did have some projects recently that required me to do some transcription work. That was the time when I used AssemblyAI to make my work easier. What I appreciate about AssemblyAI is that it gives me an error-free transcript file. That is why I used it in a few of the multiple projects that I have done in the past few months.
I mostly use AssemblyAI on my personal projects. I do not know if the whole organization is using it or not. On my personal preference for my projects, whenever I require some kind of transcript, I personally use AssemblyAI. It is my first go-to for any transcript, any transcription purposes, any conversion, or any language change purposes.
What is most valuable?
I think the best feature AssemblyAI offers for me is the errorless transcription and language translation. If I have a file or a whole transcript of any session in any other language, it translates it for me. Whatever I needed. That is something I really love about AssemblyAI.
Speed and accuracy both matter to me.
What needs improvement?
The only point where I think AssemblyAI can be improved is in the export functionality. For example, if I copy the whole text from the AssemblyAI dashboard and paste it into a Word file, it generally takes a single type of format that is very misaligned. With my experience, I first copy the whole text from the moderator, transcriber, and respondent into a Notepad. Then, after the Notepad, I copy it into a Word file, and then it works completely fine with no alignment error. AssemblyAI can work on this. On a better scale, I could directly take it or directly share the transcript into a Word file in a proper format and edit it accordingly. That would be helpful.
The only thing I miss is that I am unable to get it in a proper file in just one click. I just need something where with one click it should be in my Word file, all in order and everything. That is the point I am missing, and I think AssemblyAI can address that.
For how long have I used the solution?
I have been using AssemblyAI for two years.
What do I think about the stability of the solution?
AssemblyAI is completely stable.
What do I think about the scalability of the solution?
I do not think there are any scalability issues. I actually love using AssemblyAI.
How are customer service and support?
I have never had a chance to ask for customer support. AssemblyAI has never created any problem for me.
Which solution did I use previously and why did I switch?
Before, I was using Temi, which is also a transcription website that makes transcripts. I switched to AssemblyAI because, in comparison to Temi, AssemblyAI is faster, more accurate, and it automatically removes all the unfiltered words that Temi generally does not remove. With Temi, once I have a transcript, I have to work more, around two or three hours, to do a quality check of the transcript. But with AssemblyAI, I do not need to do much quality check. I can do it within an hour. That is the point when I switched to AssemblyAI, and I really appreciated that.
How was the initial setup?
I would say that they should definitely try this. AssemblyAI can make work really easier and faster. Why would I wish to spend more than four to five hours on a single one-hour transcript if with AssemblyAI I can do it within forty minutes?
What was our ROI?
Due to its user-friendliness, its errorless transcriptions, and the fact that I can use it anywhere, anytime.
What's my experience with pricing, setup cost, and licensing?
I do not have a subscription for AssemblyAI for now. I only used it on a trial basis. But I really love its platform. So most probably, in the future, I am going to get a subscription to AssemblyAI.
Which other solutions did I evaluate?
I did not evaluate any other options. I was pretty clear that I wanted to use AssemblyAI.
What other advice do I have?
For my personal project, I remember there was a project around eight months ago where I was doing work that required some transcription, and the transcripts were originally in German and Japanese, and I needed to deliver some of the transcript in English. At that time, I used AssemblyAI to moderate my work, and it actually helped me to cut down the time that it generally takes me to deliver a specific transcript that is translated, errorless, and in a proper format. AssemblyAI helped me a lot in that situation. I would rate this experience a 9 out of 10.