KaiAI tutor for anyone

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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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GitHub Copilot
B
DeepSeek
S
Sudowrite
S
Grammarly
A
TaglineMicrosoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Chinese open-weight powerhouse. Crazy cheap, genuinely smart.AI writing tool built specifically for fiction writers.Grammar check + tone + AI drafting, everywhere you type.
CategoryCodingChatbotsWritingWriting
PricingFree (limited) + $10/mo Pro + $19/mo BusinessFree web + ultra-cheap API (~$0.14/M input tokens)$19-$59/moFree + $12-$15/mo Premium + team plans
Best forTeams with GitHub already. Devs who don't want to change IDEs.Developers + cost-conscious builders. Anyone fine with self-hosting.Novelists, screenwriters, fiction short-form writers.Non-native English writers, business email, anyone who types a lot.
Strengths
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Brainstorm, expand, rewrite modes designed for fiction
  • Story Bible for character + plot tracking
  • Understands voice + tone better than generic chatbots
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
Weaknesses
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Pricey for casual use
  • Fiction-only focus — not for business writing
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
Kai's verdictB-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.S-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.S-tier for fiction. If you're writing a novel, this beats raw ChatGPT every time.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.
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