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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Gemini
A
Grammarly
A
GitHub Copilot
B
OpenRouter
S
TaglineGoogle's answer. Best integrated with Workspace + free for a lot.Grammar check + tone + AI drafting, everywhere you type.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.One API, every model. Pay-as-you-go, no subscriptions.
Categorychatwritingcodingdev platform
PricingFree + $20/mo Advanced (bundled with 2TB Drive)Free + $12-$15/mo Premium + team plansFree (limited) + $10/mo Pro + $19/mo BusinessPay per token — model-dependent
Best forAnyone already on Google, research tasks, summarizing long documents.Non-native English writers, business email, anyone who types a lot.Teams with GitHub already. Devs who don't want to change IDEs.Developers experimenting across models. Apps that want fallback logic.
Strengths
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
Weaknesses
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Slight markup over direct API
  • Some provider features not exposed
Kai's verdictA-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.S-tier for model-shopping. I use this for every prototype before committing.
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