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Side-by-side: what they do, what they cost, what Kai actually thinks. Pass up to 4 tools via ?tools=claude,chatgpt,gemini.
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Fathom
S
Claude Agent SDK
S
Lex
A
Perplexity
S
TaglineMeeting notes, free forever for individuals.Anthropic's SDK for building your own agents on Claude.Google Docs with an AI collaborator baked in.AI search done right. Cited answers, not chat theater.
CategoryMeetingsAgentsWritingResearch
PricingFree for individuals + $15-$29/user/mo teamsAPI usage + SDK is freeFree + $12/moFree + $20/mo Pro
Best forSolo operators, freelancers, small teams on a budget.Developers building custom agents for their own company/product.Essays, long-form drafts, thinking on the page.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Bot-joining model
  • Team features gated
  • Developer-only
  • You build the UI
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-tier for solo + free. The best free option, hands down.S-tier for builders. The right primitives. What Kai is built on under the hood.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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