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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
Perplexity
S
Lovable
A
Grammarly
A
TaglineCognition Labs' autonomous coding engineer.AI search done right. Cited answers, not chat theater.Build a full app from a prompt. Stripe-ready.Grammar check + tone + AI drafting, everywhere you type.
CategoryAgentsResearchDesignWriting
Pricing$500/moFree + $20/mo ProFree + $25-$100/moFree + $12-$15/mo Premium + team plans
Best forEngineering teams offloading tickets. Ops/platform work.Replacing Google for any question where you want a cited answer in seconds.Non-devs + solopreneurs shipping MVPs.Non-native English writers, business email, anyone who types a lot.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Generates full apps + DB + auth
  • Good for non-developers
  • Ships faster than hand-coding
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Complexity ceiling
  • Can generate brittle code
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. The strongest 'no-code' AI builder right now. Great for founder MVPs.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.
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