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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
Claude Code
S
Runway
S
Replicate
S
TaglineGrammar check + tone + AI drafting, everywhere you type.Anthropic's CLI agent. Opus-powered, operates on your repo directly.The pro's AI video tool. Gen-4 is the current bar.Run any open-source AI model with an API call.
CategoryWritingCodingVideoDev Platform
PricingFree + $12-$15/mo Premium + team plansPart of Claude Pro/Max/Team plansFree + $15-$95/moPay per second of compute
Best forNon-native English writers, business email, anyone who types a lot.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Marketing video, pitch decks, b-roll, creative shorts.Developers using open-source models (Flux, SDXL, Whisper, etc).
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
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Expensive at scale
  • Still needs post-editing
  • Cold starts on less-popular models
  • Pricing gets real at scale
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. Market leader with reason. Start here for serious video.S-tier for open-source model APIs. The default in this space.
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