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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
Agents
Voice
Video
Audio
Research
Coding
Chatbots
Image
Meetings
Design
Productivity
Writing
Data
Marketing
Education
Claude Agent SDK
S
Lex
A
Framer
A
Perplexity
S
TaglineAnthropic's SDK for building your own agents on Claude.Google Docs with an AI collaborator baked in.Design + publish sites with AI assists built in.AI search done right. Cited answers, not chat theater.
CategoryAgentsWritingDesignResearch
PricingAPI usage + SDK is freeFree + $12/moFree + $5-$30/moFree + $20/mo Pro
Best forDevelopers building custom agents for their own company/product.Essays, long-form drafts, thinking on the page.Designers shipping marketing sites without engineers.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • AI generates sections + copy + layouts
  • Designer-first publishing (not just templates)
  • Great animations
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Developer-only
  • You build the UI
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Less flexible than raw code
  • Pricing per-site adds up
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-tier for builders. The right primitives. What Kai is built on under the hood.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.A-tier for designer-led sites. S-tier if animations matter.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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