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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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Dev Platform
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Grammarly
A
NotebookLM
S
Aider
A
Gamma
A
TaglineGrammar check + tone + AI drafting, everywhere you type.Google's research notebook. Turns your docs into a podcast.Terminal-based AI pair programmer. Git-aware, model-flexible.AI slide decks that don't look AI-generated.
CategoryWritingResearchCodingProductivity
PricingFree + $12-$15/mo Premium + team plansFreeFree (open source) + whatever API you useFree + $10-$20/mo
Best forNon-native English writers, business email, anyone who types a lot.Students, researchers, anyone with a stack of PDFs or a topic to learn.Developers who want open-source tooling with full control.Pitch decks, proposals, internal presentations — fast.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Upload anything, ask questions, get cited answers
  • Audio Overview turns docs into a 10-min podcast
  • Great for studying
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • Strong templates
  • Decks, docs, webpages
  • Doesn't look generic
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Google-only
  • Can be slow on large corpora
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • Locked into Gamma's format
  • Export quality varies
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.A-tier. The right answer if you want open-source + terminal-native + model-agnostic.A-tier. Best of a boring category. Use it for first drafts, then edit in Keynote if high-stakes.
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