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All customer stories
Top Voice AI companies are building with Assembly.
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Latest Release
Universal 3.5 Pro
Our new flagship speech-to-text model handles real-world audio the way it actually happens. Available for real-time and pre-recorded audio.
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Know how every conversation went. Classify sentiment as positive, neutral, or negative — sentence by sentence, and per speaker when diarization is on.
Enable Sentiment Analysis in your transcription request and receive a sentiment label and confidence score for every sentence in the audio.
Every sentence is classified positive, neutral, or negative with a confidence score and timestamps — granular enough for real conversation analytics.
Turn on speaker labels and sentiment is tied to who said it, so you can compare agent and customer tone across a call.
An easy first step into conversation intelligence — enable it alongside transcription with no extra pipeline to build.
Add tone to every transcript so you can see what’s working and what isn’t.
Our free to paid conversion rate doubled after implementing AssemblyAI.
Colin Treseler
Founder & CEO, Supernormal
If you have an hour of content, the difference between 99% accuracy and 97% accuracy, it's a lot of time for that person to review. So you could cut down their workflow from taking half an hour, to 20 minutes, to 15 minutes — it's huge, right?
Joshua Grossberg
CTO, Kapwing
Investments in STT improvements always pay for themselves, since it is such a critical building block of the voice pipeline.
Lindsay Liu
Co-Founder & CEO, Super
AssemblyAI's managed API endpoint and diarization won me over — something Whisper couldn't provide.
Josh Mohrer
Founder, Wave.co
We needed a provider that could scale with us — offering unlimited concurrent streams, fair pricing, and responsive support.
Mark Barbir
CEO, Earmark
The transcription accuracy, reliability, and speed of AssemblyAI's API have greatly enhanced our operations.
Raj Shankar
SVP Product, Calabrio
The accuracy was strong, but the great documentation and unique models like Auto Chapters and Sentiment Analysis is what really won us over.
Nathan Webb
Product Manager, Aloware
Calls are and will remain a pertinent part of the customer service journey. Customer service isn't moving entirely to chatbots or chat interactions.
Dr. Shane Lynn
CEO, EdgeTier
