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
Taskade
B
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.AI project management with agents for each team.
CategoryChatbotsResearchWritingProductivity
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Free + $20/mo ProFree + $12/moFree + $8-$20/user/mo
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.Small teams wanting AI baked into project management.
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
  • Custom AI agents per project
  • Doc + tasks + kanban in one
  • Affordable for teams
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
  • Feature sprawl
  • AI agents need tuning to be useful
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.B-tier. Solid product but crowded market. Try it if Notion AI feels too generic.
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