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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
Devin
A
NotebookLM
S
TaglineGrammar check + tone + AI drafting, everywhere you type.Cognition Labs' autonomous coding engineer.Google's research notebook. Turns your docs into a podcast.
CategoryWritingAgentsResearch
PricingFree + $12-$15/mo Premium + team plans$500/moFree
Best forNon-native English writers, business email, anyone who types a lot.Engineering teams offloading tickets. Ops/platform work.Students, researchers, anyone with a stack of PDFs or a topic to learn.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Upload anything, ask questions, get cited answers
  • Audio Overview turns docs into a 10-min podcast
  • Great for studying
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Google-only
  • Can be slow on large corpora
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.
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