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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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Grammarly
A
GitHub Copilot
B
Devin
A
Perplexity
S
TaglineGrammar check + tone + AI drafting, everywhere you type.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Cognition Labs' autonomous coding engineer.AI search done right. Cited answers, not chat theater.
Categorywritingcodingagentsresearch
PricingFree + $12-$15/mo Premium + team plansFree (limited) + $10/mo Pro + $19/mo Business$500/moFree + $20/mo Pro
Best forNon-native English writers, business email, anyone who types a lot.Teams with GitHub already. Devs who don't want to change IDEs.Engineering teams offloading tickets. Ops/platform work.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • 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
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-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.
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