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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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Coding
Agents
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Meetings
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Productivity
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Dev Platform
Data
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Fathom
S
Perplexity
S
Claude Agent SDK
S
Lex
A
TaglineMeeting notes, free forever for individuals.AI search done right. Cited answers, not chat theater.Anthropic's SDK for building your own agents on Claude.Google Docs with an AI collaborator baked in.
CategoryMeetingsResearchAgentsWriting
PricingFree for individuals + $15-$29/user/mo teamsFree + $20/mo ProAPI usage + SDK is freeFree + $12/mo
Best forSolo operators, freelancers, small teams on a budget.Replacing Google for any question where you want a cited answer in seconds.Developers building custom agents for their own company/product.Essays, long-form drafts, thinking on the page.
Strengths
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • 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
Weaknesses
  • Bot-joining model
  • Team features gated
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Developer-only
  • You build the UI
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-tier for solo + free. The best free option, hands down.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.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.
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