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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
Pika
A
Fathom
S
Lex
A
TaglineRun any open-source AI model with an API call.The playful, accessible AI video tool.Meeting notes, free forever for individuals.Google Docs with an AI collaborator baked in.
CategoryDev PlatformVideoMeetingsWriting
PricingPay per second of computeFree + $8-$58/moFree for individuals + $15-$29/user/mo teamsFree + $12/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Social media creators, beginners, anyone wanting quick fun clips.Solo operators, freelancers, small teams on a budget.Essays, long-form drafts, thinking on the page.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Ingredients feature — combine people, objects, scenes
  • Lip sync + sound effects
  • Fun, approachable UX
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Lower fidelity than Runway/Kling
  • Still rough on complex scenes
  • Bot-joining model
  • Team features gated
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier for social/casual. B-tier for serious work. Good entry point.S-tier for solo + free. The best free option, hands down.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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