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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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Dev Platform
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Video
Audio
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Image
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Data
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Grammarly
A
Sudowrite
S
Ideogram
S
Lex
A
TaglineGrammar check + tone + AI drafting, everywhere you type.AI writing tool built specifically for fiction writers.The one that actually gets text in images right.Google Docs with an AI collaborator baked in.
CategoryWritingWritingImageWriting
PricingFree + $12-$15/mo Premium + team plans$19-$59/moFree + $8/mo + $20/mo + $60/moFree + $12/mo
Best forNon-native English writers, business email, anyone who types a lot.Novelists, screenwriters, fiction short-form writers.Anything with text — posters, ads, album covers, slide decks.Essays, long-form drafts, thinking on the page.
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
  • Best text rendering in the game
  • Strong free tier
  • Good for logos, posters, thumbnails
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Pricey for casual use
  • Fiction-only focus — not for business writing
  • Aesthetic ceiling below Midjourney
  • Less style variety
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
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.S-tier for text-in-image. Use this for posters, Midjourney for art.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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