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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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Sudowrite
S
GitHub Copilot
B
Grammarly
A
Devin
A
TaglineAI writing tool built specifically for fiction writers.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Grammar check + tone + AI drafting, everywhere you type.Cognition Labs' autonomous coding engineer.
CategoryWritingCodingWritingAgents
Pricing$19-$59/moFree (limited) + $10/mo Pro + $19/mo BusinessFree + $12-$15/mo Premium + team plans$500/mo
Best forNovelists, screenwriters, fiction short-form writers.Teams with GitHub already. Devs who don't want to change IDEs.Non-native English writers, business email, anyone who types a lot.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • Brainstorm, expand, rewrite modes designed for fiction
  • Story Bible for character + plot tracking
  • Understands voice + tone better than generic chatbots
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Pricey for casual use
  • Fiction-only focus — not for business writing
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictS-tier for fiction. If you're writing a novel, this beats raw ChatGPT every time.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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