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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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S
Grammarly
A
TaglineAutonomous AI agent that actually finishes tasks.Grammar check + tone + AI drafting, everywhere you type.
CategoryAgentsWriting
PricingFree tier + $39-$199/moFree + $12-$15/mo Premium + team plans
Best forPeople who want to hand off tasks entirely — trip planning, research, spreadsheet building.Non-native English writers, business email, anyone who types a lot.
Strengths
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
Weaknesses
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
Kai's verdictS-tier in the agent category. The first one I'd give to a non-technical friend.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.
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