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Grammarly
A
Sudowrite
S
TaglineGrammar check + tone + AI drafting, everywhere you type.AI writing tool built specifically for fiction writers.
CategoryWritingWriting
PricingFree + $12-$15/mo Premium + team plans$19-$59/mo
Best forNon-native English writers, business email, anyone who types a lot.Novelists, screenwriters, fiction short-form writers.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Brainstorm, expand, rewrite modes designed for fiction
  • Story Bible for character + plot tracking
  • Understands voice + tone better than generic chatbots
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Pricey for casual use
  • Fiction-only focus — not for business writing
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.S-tier for fiction. If you're writing a novel, this beats raw ChatGPT every time.
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