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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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Replit Agent
A
Perplexity
S
DeepSeek
S
Fathom
S
TaglineReplit's AI that builds + deploys full apps on their platform.AI search done right. Cited answers, not chat theater.Chinese open-weight powerhouse. Crazy cheap, genuinely smart.Meeting notes, free forever for individuals.
CategoryCodingResearchChatbotsMeetings
Pricing$10-$25/mo Core/TeamsFree + $20/mo ProFree web + ultra-cheap API (~$0.14/M input tokens)Free for individuals + $15-$29/user/mo teams
Best forTeachers, students, prototypers, hackathon builders.Replacing Google for any question where you want a cited answer in seconds.Developers + cost-conscious builders. Anyone fine with self-hosting.Solo operators, freelancers, small teams on a budget.
Strengths
  • Full-stack + DB + auth + deploy in one environment
  • Great for teaching/learning
  • Runs everything in-browser
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
Weaknesses
  • Locked into Replit hosting
  • Less code quality than dedicated IDEs
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Bot-joining model
  • Team features gated
Kai's verdictA-tier. Best for teaching a kid to code in 2026.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.S-tier for solo + free. The best free option, hands down.
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