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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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S
Grammarly
A
Framer
A
Leonardo.ai
A
TaglineRun any open-source AI model with an API call.Grammar check + tone + AI drafting, everywhere you type.Design + publish sites with AI assists built in.Gamer + creator image gen with model fine-tuning built in.
CategoryDev PlatformWritingDesignImage
PricingPay per second of computeFree + $12-$15/mo Premium + team plansFree + $5-$30/moFree + $12-$60/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Non-native English writers, business email, anyone who types a lot.Designers shipping marketing sites without engineers.Indie game devs, illustrators, anyone training custom style models.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • AI generates sections + copy + layouts
  • Designer-first publishing (not just templates)
  • Great animations
  • Train your own models on your style/character
  • Great for game art + concept art
  • Generous free tier
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Less flexible than raw code
  • Pricing per-site adds up
  • General output behind Midjourney
  • Can be overwhelming
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.A-tier for designer-led sites. S-tier if animations matter.A-tier for creators training custom looks. B-tier for general use.
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