Build AI notetakers users actually keep using

Most AI notetakers get dropped because the transcript isn't usable. AssemblyAI gives you the accuracy, speaker clarity, and human-readable output that turns your product into something users can't work without.

The Voice AI that separates good meeting notes from great ones

Real meetings are messy — crosstalk, accents, jargon, bad audio. AssemblyAI handles all of it, so you're not the one fielding support tickets.

Accuracy that shows up in every transcript

Build meeting intelligence that works consistently across real-world conversation scenarios.

30% fewer hallucinations than leading alternatives, with a 94.1% word accuracy rate across real-world audio conditions
Automatically capture names, domain terms, and industry vocabulary — no custom training required
Sub-second latency for live transcription and high-fidelity async output for UI display — both supported out of the box

From raw audio to structured intelligence

Transcription is table stakes. AssemblyAI gives you the layers to surface action items, track decisions, and understand what actually happened in every meeting.

Speaker diarization that reliably separates voices — even with crosstalk, far-field audio, and in-person recording conditions
Automatic topic detection, sentiment analysis, and summarization built in — no extra pipeline to stitch together
Word-level timestamps and confidence scores for search, playback sync, and downstream automation

Production-ready from day one

Start with a free API key. Scale to millions of meetings without renegotiating contracts or managing infrastructure.

Concurrent transcription across thousands of simultaneous sessions — consistent latency at any volume
SOC 2 compliant with zero data retention — meets enterprise security requirements without custom configurations
99.9% uptime SLA with dedicated support — not just docs and a Discord

The best AI notetakers are built on AssemblyAI.

See how Fireflies, Grain, Zoom, and others turned speech into a core product advantage.

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90%

Reduction in customer complaints and support tickets

Assembly is instrumental in our transcription process, providing crucial input for our LLM API to process further. It's become an integral part of our workflow.

Krish Ramineni, CEO and co-founder

Universal-3 Pro is optimized for real world conversations

Tested on diverse data sets, Universal-3 Pro delivers low missed entity rates on real world audio.

Missed entity rate by entity type Lower is better
	Date and time	Locations	Medical Terms
AssemblyAI Universal-3 Pro	7.50%	8.26%	13.61%
ElevenLabs Scribe V2	11.94%	13.58%	11.39%
OpenAI GPT-4o-Transcribe	12.29%	12.15%	16.50%
Speechmatics Enhanced	17.33%	19.03%	23.87%
Microsoft Batch Transcription	10.48%	15.91%	24.93%
Amazon Transcribe	20.76%	10.49%	13.94%
Deepgram Nova-3	18.69%	13.94%	16.95%

Explore all benchmarks

Meeting intelligence features you can ship with confidence

Every feature you'd otherwise have to build yourself — accurate, well-documented, and ready to ship.

Speaker Diarization

Reliably detect multiple speakers and what they're saying with the highest accuracy in the industry.

Summarization

Turn hours of audio into concise, actionable insights with automatic summarization.

Sentiment Analysis

Capture speaker sentiment accurately for informed business decisions and problem solving.

Word Timings

Get granular timing data to sync conversation analysis and improve task automation.

Topic Detection

Spot trends and areas of importance by identifying key conversation topics.

PII Redaction

Safeguard sensitive information automatically to ensure privacy and compliance.

Modern tools for superior intelligence

Build expertly, scale effortlessly

See how Zoom, Grain, and Supernormal built industry-leading meeting products on AssemblyAI.

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Zoom leverages AssemblyAI to help advance its AI research and development

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How Grain increased customer satisfaction by 12% after integrating AssemblyAI

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AI-powered meeting company Supernormal launches customizable Voice Agents

Common questions

: AssemblyAI supports meeting transcription with speaker diarization, real-time (sub-second) and asynchronous STT, automatic summarization, word-level timestamps and confidence scores, and optional PII redaction. Diarization results are returned in transcript.utterances for easy speaker-segmented text.
: AssemblyAI reports industry-leading meeting transcription accuracy: a 93.32% Word Accuracy Rate and 30% fewer transcription errors than alternatives. It also reduces diarization errors (64% fewer speaker counting mistakes) helping reliably attribute who said what.
: Yes. AssemblyAI's Streaming Speech-to-Text returns results in a few hundred milliseconds, enabling sub-second latency. Core pages specify approximately 300 ms "immutable transcripts" for voice agents and sub-second real-time performance for live meeting notetaker use cases.
: Enable diarization by setting speaker_labels=true. AssemblyAI segments words into chunks, computes speaker embeddings, and clusters them to assign speaker turns across the file. Output labels are generic (Speaker A/B/C). Typically around 30 seconds of speech per person is needed; brief replies may be merged. Labels aren't consistent across files by default.
: Create an account and get your API key. For recorded meetings, use an SDK to call client.transcripts.transcribe({audio: file or URL}); SDKs poll for completion or use webhooks. For live meetings, upgrade your account and use StreamingClient to connect and stream audio for real-time transcription.
: Yes. AssemblyAI provides documented integrations with meeting ecosystems like Zoom RTMS and Recall.ai (for Zoom meeting bots), and supports LiveKit for voice agent use cases. For downstream workflows, no-code options like Zapier and Power Automate let you pipe transcripts into 5,000+ apps.