KaiAI tutor for anyone

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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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DeepSeek
S
Perplexity
S
Lex
A
Cursor
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.AI search done right. Cited answers, not chat theater.Google Docs with an AI collaborator baked in.VS Code fork that made AI coding actually work.
CategoryChatbotsResearchWritingCoding
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Free + $20/mo ProFree + $12/moFree + $20/mo Pro + $40/mo Business
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Replacing Google for any question where you want a cited answer in seconds.Essays, long-form drafts, thinking on the page.Developers. Non-developers who want to ship working code.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Can feel overwhelming for non-coders
  • Expensive at scale
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.
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