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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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Chatbots
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Image
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Agents
Dev Platform
Data
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Perplexity
S
Reflect
A
Devin
A
Fathom
S
TaglineAI search done right. Cited answers, not chat theater.AI-powered networked notes. Roam with a brain.Cognition Labs' autonomous coding engineer.Meeting notes, free forever for individuals.
CategoryResearchProductivityAgentsMeetings
PricingFree + $20/mo Pro$10/mo$500/moFree for individuals + $15-$29/user/mo teams
Best forReplacing Google for any question where you want a cited answer in seconds.Knowledge workers + thinkers who want AI in their second brain.Engineering teams offloading tickets. Ops/platform work.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
  • AI auto-links related notes
  • Generates backlinks + summaries
  • Clean, minimal UX
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • 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
  • Expensive for just notes
  • Smaller community than Obsidian
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • 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. Niche but beloved. If you've outgrown Notion, try this.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier for solo + free. The best free option, hands down.
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