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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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Windsurf
A
Claude Agent SDK
S
Grammarly
A
TaglineCodeium's agentic IDE. Cascade agent + strong free tier.Anthropic's SDK for building your own agents on Claude.Grammar check + tone + AI drafting, everywhere you type.
Categorycodingagentswriting
PricingFree + $15/mo ProAPI usage + SDK is freeFree + $12-$15/mo Premium + team plans
Best forDevelopers who want Cursor-like power for less money.Developers building custom agents for their own company/product.Non-native English writers, business email, anyone who types a lot.
Strengths
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
Weaknesses
  • Smaller community
  • Model selection more limited
  • Developer-only
  • You build the UI
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
Kai's verdictA-tier. Close second to Cursor. If $5/mo matters, start here.S-tier for builders. The right primitives. What Kai is built on under the hood.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.
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