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