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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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Replicate
S
Lex
A
Grammarly
A
Ideogram
S
TaglineRun any open-source AI model with an API call.Google Docs with an AI collaborator baked in.Grammar check + tone + AI drafting, everywhere you type.The one that actually gets text in images right.
Categorydev platformwritingwritingimage
PricingPay per second of computeFree + $12/moFree + $12-$15/mo Premium + team plansFree + $8/mo + $20/mo + $60/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Essays, long-form drafts, thinking on the page.Non-native English writers, business email, anyone who types a lot.Anything with text — posters, ads, album covers, slide decks.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Best text rendering in the game
  • Strong free tier
  • Good for logos, posters, thumbnails
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Aesthetic ceiling below Midjourney
  • Less style variety
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.S-tier for text-in-image. Use this for posters, Midjourney for art.
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