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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
Cursor
S
TaglineRun any open-source AI model with an API call.Grammar check + tone + AI drafting, everywhere you type.VS Code fork that made AI coding actually work.
Categorydev platformwritingcoding
PricingPay per second of computeFree + $12-$15/mo Premium + team plansFree + $20/mo Pro + $40/mo Business
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Non-native English writers, business email, anyone who types a lot.Developers. Non-developers who want to ship working code.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Can feel overwhelming for non-coders
  • Expensive at scale
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.
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