AssemblyAI vs Otter.ai
AssemblyAI and Otter.ai are both audio AI tools, tracked here on price, platforms, integrations, and capabilities. Every figure below is read from the vendor's own pages and dated. No score and no winner: the facts do the picking.
AssemblyAI
Voice AI infrastructure for builders
AssemblyAI delivers production-ready Voice AI models, including pre-recorded and real-time streaming speech-to-text, speaker diarization, and voice agent APIs. It provides advanced models like Universal-3.5 Pro, supporting multiple languages and specialized medical transcription modes.
Otter.ai
AI meeting assistant for audio recording, note-taking, and summaries
Otter.ai is an AI meeting assistant that records audio, transcribes conversations in real time, and generates summaries with action items. It joins virtual meetings automatically or records in person.
At a glance
Capability tags are factual labels we assign when a tool is added; they describe what a tool does, not how well it does it.
Checked against the vendors. Written from each vendor's own site and last re-checked there: AssemblyAI on July 31, 2026 · Otter.ai on July 27, 2026. Vendors change pricing and features without notice, so confirm anything that decides your purchase on the vendor's page.
Also in audio
A tool we have an affiliate relationship with. It is not part of the comparison above and we are not calling it the better pick.
- Recording and summarizing meetings without sending a bot into the call
- Pulling action items out of a call instead of writing notes during it
- Enhancing clarity in online meetings
Key features
AssemblyAI
- Pre-recorded and real-time streaming speech-to-text transcription
- Speaker diarization to segment utterances by speaker
- LLM-powered Speech Understanding and LLM Gateway
- Custom keyterms prompting and Medical Mode for specialized terminology
Otter.ai
- Live transcription of spoken audio
- Automated meeting summaries
- Speaker identification
- Action item extraction
- Integration with calendar and video conferencing platforms
What each one does well
AssemblyAI
- ✓ Building real-time voice agents
- ✓ Transcribing pre-recorded audio files with high accuracy
- ✓ Performing call analytics and medical transcription
Otter.ai
- ✓ Transcribing live meetings and interviews
- ✓ Generating automated meeting notes and summaries
- ✓ Improving accessibility for spoken content
People also ask
Which is cheaper, AssemblyAI or Otter.ai?
AssemblyAI starts at $0.02 usage-based and Otter.ai starts at $16.99/mo. The two are billed over different periods, so we do not rank them on price.
Does AssemblyAI or Otter.ai have a free plan?
AssemblyAI publishes no free plan, and Otter.ai has a free plan.
What is the difference between AssemblyAI and Otter.ai?
Both are tracked for transcription, speaker-identification. Of the capabilities they do not share, only AssemblyAI is tracked for speech-to-text, developer-api, and only Otter.ai is tracked for meeting-notes, summarization.
How much do AssemblyAI and Otter.ai cost?
AssemblyAI: from $0.02 usage-based. Otter.ai: free plan, then $16.99/mo.
Answers are generated from the tracked plans and capability tags shown above, so they move when the vendors' pages do.
Full fact sheets, FAQs, and discussion links: AssemblyAI · Otter.ai · all audio tools