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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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Lex
A
Ideogram
S
Claude Agent SDK
S
Perplexity
S
TaglineGoogle Docs with an AI collaborator baked in.The one that actually gets text in images right.Anthropic's SDK for building your own agents on Claude.AI search done right. Cited answers, not chat theater.
CategoryWritingImageAgentsResearch
PricingFree + $12/moFree + $8/mo + $20/mo + $60/moAPI usage + SDK is freeFree + $20/mo Pro
Best forEssays, long-form drafts, thinking on the page.Anything with text — posters, ads, album covers, slide decks.Developers building custom agents for their own company/product.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Best text rendering in the game
  • Strong free tier
  • Good for logos, posters, thumbnails
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Aesthetic ceiling below Midjourney
  • Less style variety
  • Developer-only
  • You build the UI
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictA-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for text-in-image. Use this for posters, Midjourney for art.S-tier for builders. The right primitives. What Kai is built on under the hood.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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