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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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Chatbots
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Coding
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Agents
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Grammarly
A
GitHub Copilot
B
MagicSchool
S
Cursor
S
TaglineGrammar check + tone + AI drafting, everywhere you type.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.AI platform built for teachers. Lesson plans + IEPs + admin.VS Code fork that made AI coding actually work.
CategoryWritingCodingEducationCoding
PricingFree + $12-$15/mo Premium + team plansFree (limited) + $10/mo Pro + $19/mo BusinessFree + $100/yr Plus + school plansFree + $20/mo Pro + $40/mo Business
Best forNon-native English writers, business email, anyone who types a lot.Teams with GitHub already. Devs who don't want to change IDEs.Teachers prepping materials. School districts.Developers. Non-developers who want to ship working code.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • 60+ teacher-specific tools
  • Generous free tier
  • FERPA + COPPA compliant for schools
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Teacher-only focus
  • Less useful for students
  • Can feel overwhelming for non-coders
  • Expensive at scale
Kai's verdictA-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 teachers. If you teach K-12, start here this week.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.
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