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Grammarly
A
Claude Code
S
Perplexity
S
Aider
A
TaglineGrammar check + tone + AI drafting, everywhere you type.Anthropic's CLI agent. Opus-powered, operates on your repo directly.AI search done right. Cited answers, not chat theater.Terminal-based AI pair programmer. Git-aware, model-flexible.
Categorywritingcodingresearchcoding
PricingFree + $12-$15/mo Premium + team plansPart of Claude Pro/Max/Team plansFree + $20/mo ProFree (open source) + whatever API you use
Best forNon-native English writers, business email, anyone who types a lot.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Replacing Google for any question where you want a cited answer in seconds.Developers who want open-source tooling with full control.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. The right answer if you want open-source + terminal-native + model-agnostic.
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