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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
Copy.ai
A
Luma Dream Machine
A
TaglineGrammar check + tone + AI drafting, everywhere you type.Anthropic's CLI agent. Opus-powered, operates on your repo directly.AI GTM platform. Workflows for sales + marketing ops.Smooth, cinematic motion. Image-to-video specialist.
CategoryWritingCodingMarketingVideo
PricingFree + $12-$15/mo Premium + team plansPart of Claude Pro/Max/Team plansFree + $49-$249/moFree + $10-$500/mo
Best forNon-native English writers, business email, anyone who types a lot.Developers who want an agent, not autocomplete. Large refactors, tests, docs.RevOps + marketing ops automating repetitive tasks.Photographers animating stills, cinematic b-roll.
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
  • Workflow builder for GTM automations
  • CRM enrichment + outbound sequences
  • Scales better than ad-hoc prompts
  • Best image-to-video in the category
  • Great camera motion control
  • Ray 2 model produces striking shots
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Overlaps with general chatbots
  • Workflow setup takes time
  • Prompt fidelity below Runway
  • Queue times on free tier
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.A-tier for ops automation. B-tier for simple copy (use Claude).A-tier. Best for cinematic image-to-video. Pair with Runway for coverage.
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