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Fathom vs AssemblyAI

A feature-by-feature comparison of Fathom and AssemblyAI across 7 capability categories.

Try Fathom (opens in a new tab)
Try AssemblyAI (opens in a new tab)

Modalities — Tie

Modalities: Fathom compared with AssemblyAI
FeatureFathomAssemblyAI
Text Input
Yes, requires free plan. Ask Fathom is typed Q&A over past calls.Partial. Prompts steer Speech Understanding. Primary input is audio.
Image Upload / Vision
No. Meeting notes, not vision.No. Speech platform, not vision.
Image Generation
No. Does not generate images.No. Does not generate images.
Voice Mode
Partial. Records spoken meetings. Not a conversational voice assistant.Yes, requires plus plan. Voice Agent WebSocket is a conversational speech product.
Video Understanding
No. Audio of the call, not video-as-vision.No. Audio/speech focus.
Video Generation
No. Not a video generation product.No. Not a video generation product.
File Upload (PDF, DOCX)
Unknown. Import of recordings was not confirmed on the homepage fetch.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. Bot or bot-free meeting capture, then transcripts and summaries.Yes, requires plus plan. Realtime and batch STT are the core product.
Canvas / Artifact Editor
No. Notes UI, not a canvas.No. Not a canvas product.
Screen Sharing / Computer Use
No. No computer-use takeover.No. No computer-use product.

Memory & Context — Tie

Memory & Context: Fathom compared with AssemblyAI
FeatureFathomAssemblyAI
Persistent Memory
Partial. Ask Fathom searches past calls. Not a personal-facts memory profile.Partial. Voice Agent retains session context during a call.
Large Context Window
No. Not an LLM token-window product.Unknown. Agent context limits were not checked.
Custom Instructions
Unknown. Not specified on the homepage.Yes, requires plus plan. Configure Voice Agent prompts and guardrails.
Conversation History
Yes, requires free plan. Call library persists.Partial. Transcripts stored per job. Realtime is per-session.

Integrations — AssemblyAI Wins

Integrations: Fathom compared with AssemblyAI
FeatureFathomAssemblyAI
Web Search / Browsing
No. Searches your calls, not the live web.Unknown. Web search in Voice Agent was not confirmed.
Plugins / Extensions
Yes, requires free plan. Syncs to Slack, Salesforce, HubSpot, Notion, Asana.Partial. LLM Gateway and integrations connect upstream models.
API Access
Unknown. A public developer API was not on the homepage.Yes, requires plus plan. REST and WebSocket APIs for STT and Voice Agent.
Zapier Integration
Unknown. No Zapier listing was checked this round.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 call notes into Slack/CRM. Not a multiplayer AI doc.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 meetings.No. Not a cited-search product.

Developer — Tie

Developer: Fathom compared with AssemblyAI
FeatureFathomAssemblyAI
Function Calling
No. Not a developer function-calling API.Partial. Voice Agent can call tools via LLM Gateway.
Streaming Responses
Yes, requires free plan. Live notes during the meeting.Yes, requires plus plan. Realtime STT streams partial transcripts over WebSocket.
Fine-Tuning
No. You do not train Fathom.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 and action items. Not JSON schema.Partial. Speech Understanding returns structured entities and summaries.
Reasoning / Thinking Mode
No. Ask Fathom is retrieval, not Deep Think.No. Not a reasoning LLM.
Local Execution
No. Cloud SaaS.No. Cloud-only STT. Distinct from self-hosted Whisper.
Open Weights
No. Closed product.No. Proprietary models and APIs.
Multi-Agent Orchestration
No. Not an orchestrator.No. Single voice agent per session.

Platforms — Fathom Wins

Platforms: Fathom compared with AssemblyAI
FeatureFathomAssemblyAI
Web App
Yes, requires free plan. fathom.video web app.Partial. Dashboard for API keys and playground.
iOS App
Unknown. Not confirmed on the homepage fetch.No. No iOS app.
Android App
Unknown. Not confirmed on the homepage fetch.No. No Android app.
Desktop App
Unknown. Bot-free capture may be desktop; installer was not on the homepage.No. No desktop app.
Chrome Extension
Unknown. Not confirmed on the homepage fetch.No. No Chrome extension.

Privacy — Fathom Wins

Privacy: Fathom compared with AssemblyAI
FeatureFathomAssemblyAI
GDPR Compliant
Yes, requires free plan. Homepage lists GDPR (plus SOC 2 Type II and HIPAA).Unknown. Compliance docs were not re-read.
Opt Out of Data Training
Unknown. Training policy was not on the homepage snippet.Unknown. Training policy was not checked.
Enterprise Privacy Mode
Yes, requires enterprise plan. SSO/SCIM plus SOC 2 / GDPR / HIPAA on the homepage. Used at 300k+ companies.Yes, requires enterprise plan. Guardrails, EU data residency options, and enterprise contracts.

Workspaces — Fathom Wins

Workspaces: Fathom compared with AssemblyAI
FeatureFathomAssemblyAI
Projects / Folders
Yes, requires free plan. Call library persists.Partial. Dashboard organizes API keys and usage.