Otter.ai vs AssemblyAI
A feature-by-feature comparison of Otter.ai and AssemblyAI across 7 capability categories.
Modalities — Tie
| Feature | Otter.ai | AssemblyAI |
|---|---|---|
Text Input | Yes, requires free plan. Otter Chat and the transcript editor take typed questions over meeting notes. | Partial. Prompts steer Speech Understanding. Primary input is audio. |
Image Upload / Vision | No. Meeting transcription, not a vision model. | No. Speech platform, not vision. |
Image Generation | No. Does not generate images. | No. Does not generate images. |
Voice Mode | Partial. Live captions and spoken meetings. It is not a two-way voice assistant like ChatGPT Voice. | Yes, requires plus plan. Voice Agent WebSocket is a conversational speech product. |
Video Understanding | No. Joins Zoom/Meet/Teams for audio. It does not watch the video track as a vision model. | No. Audio/speech focus. |
Video Generation | No. Not a video generation product. | No. Not a video generation product. |
File Upload (PDF, DOCX) | Partial. You can import audio/video of meetings. Not a general PDF knowledge base. | Partial. Upload audio/video files for async transcription. |
Code Execution | No. Not a code sandbox. | No. STT APIs, not a code sandbox. |
Audio Input | Yes, requires free plan. Core product: live and recorded meeting transcription. Basic includes 300 minutes/month. | Yes, requires plus plan. Realtime and batch STT are the core product. |
Canvas / Artifact Editor | No. Transcript editor, not a canvas/artifacts UI. | No. Not a canvas product. |
Screen Sharing / Computer Use | No. No computer-use takeover. | No. No computer-use product. |
Memory & Context — Tie
| Feature | Otter.ai | AssemblyAI |
|---|---|---|
Persistent Memory | Partial. Otter Chat over your meeting library. That is search over transcripts, not a personal-facts memory profile. | Partial. Voice Agent retains session context during a call. |
Large Context Window | No. Not an LLM context-window product. Limits are minutes, not tokens. | Unknown. Agent context limits were not checked. |
Custom Instructions | Unknown. Custom vocabulary/vocabulary was not re-checked on the 2026 pricing page. | Yes, requires plus plan. Configure Voice Agent prompts and guardrails. |
Conversation History | Yes, requires free plan. Meetings and chats are saved in your Otter account. | Partial. Transcripts stored per job. Realtime is per-session. |
Integrations — AssemblyAI Wins
| Feature | Otter.ai | AssemblyAI |
|---|---|---|
Web Search / Browsing | No. Searches your meetings, not the live web. | Unknown. Web search in Voice Agent was not confirmed. |
Plugins / Extensions | Partial. Zoom/Meet/Teams plus Zapier and an MCP server. Not a GPT-style plugin store. | Partial. LLM Gateway and integrations connect upstream models. |
API Access | Unknown. An Otter developer API was not confirmed on the pricing page this round. | Yes, requires plus plan. REST and WebSocket APIs for STT and Voice Agent. |
Zapier Integration | Yes, requires plus plan. Zapier is listed on paid/Basic materials as a meeting-notes automation path. | Unknown. Zapier listing was not checked. |
Custom GPTs / Bots | No. No custom-GPT store. | Yes, requires plus plan. Voice Agent is a deployable speech bot. |
Real-time Collaboration | Partial. Shared meetings and live notes. Not a multiplayer AI document. | No. No multiplayer product. |
Live Social Data Integration | No. No live social firehose. | No. No social firehose. |
Live Citation Mapping | No. Citations are to your meeting, not the academic web. | No. Not a cited-search product. |
Developer — Tie
| Feature | Otter.ai | AssemblyAI |
|---|---|---|
Function Calling | Partial. MCP server is listed. That is tool access for assistants, not a public function-calling chat API. | Partial. Voice Agent can call tools via LLM Gateway. |
Streaming Responses | Yes, requires free plan. Live captions stream as people talk. | Yes, requires plus plan. Realtime STT streams partial transcripts over WebSocket. |
Fine-Tuning | No. You do not train Otter’s speech model. | Unknown. Custom STT was not confirmed on homepage. |
Embeddings API | No. Not an embeddings API. | No. Not an embeddings product. |
Structured Output (JSON) | Partial. Summaries, action items, and speakers. Not arbitrary JSON schema. | Partial. Speech Understanding returns structured entities and summaries. |
Reasoning / Thinking Mode | No. Not an LLM reasoning-mode product. | No. Not a reasoning LLM. |
Local Execution | No. Cloud SaaS. Desktop recorder still sends audio to Otter. | No. Cloud-only STT. Distinct from self-hosted Whisper. |
Open Weights | No. Closed speech models. | No. Proprietary models and APIs. |
Multi-Agent Orchestration | No. Not an orchestrator. | No. Single voice agent per session. |
Platforms — Otter.ai Wins
| Feature | Otter.ai | AssemblyAI |
|---|---|---|
Web App | Yes, requires free plan. otter.ai web app for notes and Otter Chat. | Partial. Dashboard for API keys and playground. |
iOS App | Yes, requires free plan. Official iOS app. | No. No iOS app. |
Android App | Yes, requires free plan. Official Android app. | No. No Android app. |
Desktop App | Yes, requires free plan. Bot-free desktop recorder is advertised. | No. No desktop app. |
Chrome Extension | Yes, requires free plan. Chrome capture extension. | No. No Chrome extension. |
Privacy — Tie
| Feature | Otter.ai | AssemblyAI |
|---|---|---|
GDPR Compliant | Unknown. Needs a current DPA read. Not asserted from the marketing homepage. | Unknown. Compliance docs were not re-read. |
Opt Out of Data Training | Unknown. Training-use toggle was not checked on a privacy policy this round. | Unknown. Training policy was not checked. |
Enterprise Privacy Mode | Yes, requires enterprise plan. Enterprise adds SSO, SCIM, and a HIPAA add-on on the pricing page. | Yes, requires enterprise plan. Guardrails, EU data residency options, and enterprise contracts. |
Workspaces — Tie
| Feature | Otter.ai | AssemblyAI |
|---|---|---|
Projects / Folders | Partial. Meetings can be organized; workspace folders on paid were not fully mapped. | Partial. Dashboard organizes API keys and usage. |