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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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Devin
A
Gemini
A
Fathom
S
Perplexity
S
TaglineCognition Labs' autonomous coding engineer.Google's answer. Best integrated with Workspace + free for a lot.Meeting notes, free forever for individuals.AI search done right. Cited answers, not chat theater.
CategoryAgentsChatbotsMeetingsResearch
Pricing$500/moFree + $20/mo Advanced (bundled with 2TB Drive)Free for individuals + $15-$29/user/mo teamsFree + $20/mo Pro
Best forEngineering teams offloading tickets. Ops/platform work.Anyone already on Google, research tasks, summarizing long documents.Solo operators, freelancers, small teams on a budget.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • 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
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Bot-joining model
  • Team features gated
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.S-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.
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