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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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Replicate
S
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A
Fathom
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DeepSeek
S
TaglineRun any open-source AI model with an API call.AI-powered networked notes. Roam with a brain.Meeting notes, free forever for individuals.Chinese open-weight powerhouse. Crazy cheap, genuinely smart.
CategoryDev PlatformProductivityMeetingsChatbots
PricingPay per second of compute$10/moFree for individuals + $15-$29/user/mo teamsFree web + ultra-cheap API (~$0.14/M input tokens)
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Knowledge workers + thinkers who want AI in their second brain.Solo operators, freelancers, small teams on a budget.Developers + cost-conscious builders. Anyone fine with self-hosting.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • AI auto-links related notes
  • Generates backlinks + summaries
  • Clean, minimal UX
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Expensive for just notes
  • Smaller community than Obsidian
  • Bot-joining model
  • Team features gated
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. Niche but beloved. If you've outgrown Notion, try this.S-tier for solo + free. The best free option, hands down.S-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.
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