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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
Devin
A
Fathom
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.Cognition Labs' autonomous coding engineer.Meeting notes, free forever for individuals.
CategoryChatbotsAgentsMeetings
PricingFree web + ultra-cheap API (~$0.14/M input tokens)$500/moFree for individuals + $15-$29/user/mo teams
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Engineering teams offloading tickets. Ops/platform work.Solo operators, freelancers, small teams on a budget.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Bot-joining model
  • Team features gated
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier for solo + free. The best free option, hands down.
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