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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Pricing
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 |
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All fees are non-refundable and non-cancellable except as required by law.
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Software as a Service (SaaS)
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Support is available 24/7 via chat on our website at <www.assemblyai.com > or email at support@assemblyai.com .
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Customer reviews
Automated multilingual call transcription has transformed accuracy and reduced manual effort
What is our primary use case?
I use AssemblyAI for audio transcription in multiple different languages. It has the capability of translating and transcribing into multiple different languages of both India as well as in the world. It also has good diarization capabilities, which is why I use AssemblyAI .
I had a customer use case problem where I had to transcribe lots of customer support calls into transcriptions in Hindi and multiple different Indic languages, as well as in foreign languages. AssemblyAI was helpful for this purpose.
AssemblyAI has been integrated into multiple different clients' use cases, and it was one of the core features in the AWS pipeline audio analytics pipeline that we created. It has benefited us significantly in saving costs of transcription.
What is most valuable?
The best features AssemblyAI offers are its blazing fast transcribing skills and accurate results. It also has the capability of diarization, as well as transcribing in multiple different languages, both in foreign and Indic languages.
I particularly value the accurate transcription of the language that the user provides as input and getting the best output without any kind of noise or silence. Automatic silence removal and voice activity detection are the best features of AssemblyAI that I appreciate in my daily use.
The outputs are really accurate. AssemblyAI already cares for the overall grammar, syntax, and the different nuances of the particular speakers. I believe the accuracy part has improved significantly from the previous versions that were available and should continue to improve further to become the best product in the market.
There was a saving of about 40 to 50% in transcription of audio analytics calls because previously, it was all done by humans, which could take days of effort and cost. This has significantly reduced to a great amount.
We tested with Deepgram and AWS transcription service that is already available in the market, and then we switched over to AssemblyAI.
What needs improvement?
AssemblyAI should definitely cater to multiple different languages of the world as well as in India. There are multiple different Indic languages and dialects available, and AssemblyAI should cater to those. Additionally, there might be multiple speakers available in a room in a particular meeting, and for that, proper diarization is required for identifying the different speakers as well as their names. These are some of the features that require attention by AssemblyAI, and they can definitely improve on that.
The pricing should definitely be looked at and the features should be worked upon as suggested.
For how long have I used the solution?
I have been using AssemblyAI for about two to three years.
What do I think about the stability of the solution?
AssemblyAI is definitely stable.
What do I think about the scalability of the solution?
AssemblyAI has a very good scalable solution. It has definitely been integrated in such a way that it handles multiple audios at a time. Regarding the pricing, I believe it is already in a very good range.
How are customer service and support?
Customer support is definitely great with AssemblyAI. If you have any issues or encounter any problems in setting up, you can definitely reach out to the customer support and you can immediately get a solution.
Which solution did I use previously and why did I switch?
I was using the AWS transcription service. There were problems of identifying the different languages, the different Indic languages that we have. AssemblyAI came into the picture and it solved a great deal of the problem.
How was the initial setup?
The setup was pretty much easy. You just go to the AWS Marketplace and get this particular service provisioned and directly you can start using it with an API endpoint and key. The setup is pretty much easy.
What was our ROI?
I would say it is a time-saved and money-saved metric that should be considered here. That is how AssemblyAI is ruling the market.
What other advice do I have?
I would give AssemblyAI a rating of 10 out of 10. I would suggest others to go for AssemblyAI because it is the best in the market in terms of accuracy, outputs, and the different languages that it caters to and transcribes. It is a very good product overall.
AssemblyAI has data privacy and security enabled so that the conversations that take place and are used for transcription are not leaked out to the public or leaked out in the public domain. There should not be any sort of sensitivity, privacy, or personally identifiable information data that gets leaked out. These things should be enforced strictly, and I believe AssemblyAI does that already.
Fast transcription has powered real-time interviews and accurate entity-based meeting notes
What is our primary use case?
In my personal project, I used AssemblyAI for audio entity recognition. I gave it some audio files and AssemblyAI processed them to provide entity recognition. For example, if the audio contained names of someone, it highlighted them as person names and these types of entities.
In the freelance project that I made recently, I used it for transcribing audio interviews. We were making an audio and video interviewing system and we needed an API to transcribe audio into text. AssemblyAI was used for speech-to-text translation because it was the fastest and the best option for our use case.
In the audio and video project I was making for a freelance client, our use case was speed. The main thing that would differentiate us from our competitors was speed. We needed a quick solution that was also cost-effective. AssemblyAI stood out and it provided us quick results that helped us transcribe the audio stream quite instantly and use it to process and show results to the user.
What is most valuable?
I noticed that it was quite quick. I also noticed that it offers flags to check when the audio has stopped. This helped me identify the different users in that audio and properly transcribe the text and make meeting notes and these types of things.
It was quite accurate. We were using it to transcribe speech to text, and then we used that transcribed text to generate follow-up questions for the interviewers. It needed to be accurate. As our experience suggested, it was quite accurate and we were able to fulfill the use case.
What needs improvement?
I think the documentation could be improved a bit because it is a little difficult to follow for the first-time user. If you do not have an MCP right now, I recommend that you make an MCP for AssemblyAI API because now is the time of AI and agents. An MCP helps us to integrate it with our system quite easily.
I think it was good and it fulfilled my use cases, but there is always room for improvement. I gave it an 8 and not a 10 because nothing is 10 out of 10 in this world.
For how long have I used the solution?
I have used AssemblyAI twice now. One time I used it for an audio entity recognition software I made for my personal learning. I recently used it in a freelance project that I was doing.
How are customer service and support?
I was offered assistance when your representative contacted me on LinkedIn and offered to send her the screenshot of the completion, and she will hopefully give me a gift card or something.
Which solution did I use previously and why did I switch?
Previously we were using Deepgram for audio transcription. Deepgram is an API for audio transcription, but it was comparatively slow and somewhat not cost-effective when compared to AssemblyAI. After shifting to AssemblyAI, the biggest two points we experienced were that the speed of our software increased and our costing of the API reduced. It helped us with the speed and the cost-effectiveness.
If public cloud, private cloud, or hybrid cloud, which cloud provider do you use?
Automated transcripts have transformed meetings and podcasts into fast, detailed content workflows
What is our primary use case?
Our main use case for AssemblyAI is automatically transcribing clients' meeting recordings, podcasts, and video interviews, and we also use it to generate summaries and extract key topics from long recordings. It saves our editor's team an enormous amount of time.
In one of my recent projects, we were producing weekly podcasts containing 12 different clients, and we had a meeting with the clients where we had to transcribe company show notes and repurpose them into blog content. Manually transcribing that volume was impossible for our small company, so we integrated AssemblyAI 's API into our workflow, and within a minute of a recording being uploaded, it was fully transcribed and speaker-labeled. What used to take three hours per episode was reduced to under five minutes.
For client meetings, when we have the client meeting, some of us find it very difficult to note down the specific points and sometimes miss them, but by using AssemblyAI for that interview call, we get it easily transcribed. We have the main focus, and we get to know all the transcribed main points, so we don't miss out on anything.
We use an API integration to build AssemblyAI into our internal content management system, so when a file is uploaded, it automatically triggers the AssemblyAI transcription pipeline, and returns the result directly into our platform within minutes.
What is most valuable?
The best features AssemblyAI offers are the speaker diarization, which identifies who is speaking, the automatic summarization and sentiment analysis, topic detection, and the extremely accurate speech-to-text, even with different accents and background noise.
Speaker detection is what makes the biggest difference in my day-to-day work, especially when meetings happen with many people, multiple people interviewing, and panel discussions. It automatically identifies who the client is and who the speaker is, and for client-facing transcript accuracy, knowing who said what is absolutely critical, and AssemblyAI handles this better than any other tool we tested.
AssemblyAI has positively impacted our organization by allowing us to scale from managing five client accounts to 12 without hiring additional staff. Our client capability doubled while our costs stayed controlled, and client satisfaction scores also improved because the turnaround time on a transcript dropped from two days to same-day delivery.
What needs improvement?
AssemblyAI could be improved because the accuracy drops noticeably with a heavy accent or a very fast speaker, and pricing can become expensive at a high volume, so better multi-support or more affordable enterprise pricing tiers would make it significantly more competitive.
AssemblyAI takes data security seriously, offering data deletion options and not using submission audio to train their models by default, which is critical for us handling confidential client content. However, clearer documentation around compliance certificates such as SOC 2 and GDPR would give enterprise clients more confidence.
AssemblyAI is expensive, but overall, it is a good product.
For how long have I used the solution?
I have been using AssemblyAI for about six months since joining the company.
What do I think about the stability of the solution?
AssemblyAI is stable in my experience; however, when the user's voice is unclear, it sometimes lags there.
Overall, the accuracy of AssemblyAI's output is consistently above 95% for clear audio, and it is reliable enough for professional use without heavy manual correction. The reliability of the API uptime has been excellent in our experience.
What do I think about the scalability of the solution?
AssemblyAI's scalability can handle more volume if our company grows.
How are customer service and support?
I never had to contact customer support because we never found any complaints or any bugs that would require us to contact them.
Which solution did I use previously and why did I switch?
This was my first time using a transcribing application, and AssemblyAI did a great job.
What was our ROI?
We save approximately 85% of the time on transcribing tasks, and in workforce terms, we estimate AssemblyAI replaced what would have been a full-time transcriber role, which would cost around 35,000 to 40,000 per year. The API subscription costs a fraction of that, making the ROI extremely clear.
We saved around 85% of our workforce's time, and the cost savings are around 35,000 to 45,000 per year, making the ROI extremely clear.
What other advice do I have?
AssemblyAI is a very good application for meetings, client interviewing, and podcasts, so I think everyone should use it in their company. I rate AssemblyAI an 8 out of 10 because the accuracy drops with heavy accents and fast speakers, and the pricing is expensive, so I think 8 is an appropriate rating for this application.
Real-time transcription has powered accurate culture scoring for diverse workplace meetings
What is our primary use case?
What is most valuable?
The best features AssemblyAI offers are transcription and real-time transcriptions. The speed of real-time transcription stands out to me because it's 20 to 40% faster than the industry benchmark, so speed is definitely one of the pros of AssemblyAI.
AssemblyAI has positively impacted my organization by being a fundamental part of our main use flow, where our bot joins the meetings and transcribes them into text. Once the text is generated, it goes to our internal LLM to get culture scores, making it one of the main fundamental parts of our product.
What needs improvement?
AssemblyAI could be improved because when we have different accents on the same call, it usually fails, especially when we have American, Asian, and Latin American speakers on the same call, making the transcriptions a bit noisy.
The transcription quality of non-native English speakers should be improved. I choose nine out of ten because it's really good and fast, working well when there is an English speaker on the call, so the quality of the transcription is really good. Latency is almost zero, and it's 20 to 40% faster than the industry benchmarks. I only rate it as nine because it lacks accent detection and the quality for different accents.
For how long have I used the solution?
How are customer service and support?
Which solution did I use previously and why did I switch?
Which other solutions did I evaluate?
What other advice do I have?
Which deployment model are you using for this solution?
If public cloud, private cloud, or hybrid cloud, which cloud provider do you use?
Accurate transcripts with clear grammar have supported reliable speaker-based dialogue analysis
What is our primary use case?
I use AssemblyAI only with audio files, not for real-time transcription. I mainly use only US English, and I have not tried other languages. I upload audio files through AssemblyAI API, and they provide the transcription script with speaker identification and the dialogues.
What is most valuable?
The main features I appreciate in AssemblyAI are that it provides better accuracy compared to other transcription services, with clear grammar and no errors in spelling mistakes or grammatical mistakes, delivering clear transcription.
The primary benefit I receive from their product is much more accurate transcription. First, it is a very affordable service, and second, the accuracy is much better compared to other services such as Deepgram or AWS transcription services, which are the main benefits. Third, the speaker identification capability is better.
What needs improvement?
A few drawbacks I observed in the speaker identification are that in some videos where text and names appear on the video frames, AssemblyAI does not identify the actual speaker name, instead providing generic names such as Speaker A, Speaker B, Speaker C, or Speaker X, Y, Z.
AssemblyAI does not identify the real speaker in some audio or video files, just sending Speaker A, Speaker B, or Speaker C. They are not easily identifying speakers in some instances.
AssemblyAI does not provide a cloud service; I simply upload the audio file to the API, and they store it somewhere internally to send me the transcription text.
For additional functions, the API does not provide video uploading functionality, and I need to convert video to audio first before uploading it to AssemblyAI.
For how long have I used the solution?
I have been working with AssemblyAI for approximately one year.
How are customer service and support?
AssemblyAI should respond more quickly because when I post a ticket, they take too much time to respond to it.
Which solution did I use previously and why did I switch?
I did not continue working with Deepgram after trying it, but I recently started using AssemblyAI because Deepgram does not provide accurate transcription. I chose AssemblyAI because I did not use Deepgram again.
How was the initial setup?
I only need to create an account on AssemblyAI, and initially, they provide some credits for transcription, which is enough initially. However, if usage increases, I can purchase a subscription from there.
What's my experience with pricing, setup cost, and licensing?
I think the price for the product is a seven.
Which other solutions did I evaluate?
I can compare AssemblyAI with Deepgram. I would choose only AssemblyAI instead of Deepgram when comparing both products. The main reason I chose it is that it is far better compared to Deepgram regarding speaker identification, the clear verbatim process, and the time-stamp process, providing accurate time-stamping and the dialogues.
If I compare AssemblyAI with other services such as Gameloop, ChatAI, and Deepgram, the accuracy is far better, always maintaining the grammar and providing good, accurate text for audio or video files.
What other advice do I have?
The AssemblyAI noise filtering feature exists, but I did not use that feature. I use the existing API where I upload the audio to AssemblyAI, and after a few seconds or minutes, I continuously check if the transcription is done. Once it is done, I pass the transcription text into a file and generate an SRT file, a text file, and a doc file.
It works fine with different accents.
I rate this product an overall 8 out of 10.