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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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Chatbots
Research
Coding
Image
Video
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Meetings
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Productivity
Audio
Writing
Agents
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Replicate
S
Fathom
S
Pika
A
Lex
A
TaglineRun any open-source AI model with an API call.Meeting notes, free forever for individuals.The playful, accessible AI video tool.Google Docs with an AI collaborator baked in.
CategoryDev PlatformMeetingsVideoWriting
PricingPay per second of computeFree for individuals + $15-$29/user/mo teamsFree + $8-$58/moFree + $12/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Solo operators, freelancers, small teams on a budget.Social media creators, beginners, anyone wanting quick fun clips.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
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
  • Ingredients feature — combine people, objects, scenes
  • Lip sync + sound effects
  • Fun, approachable UX
  • 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
  • Bot-joining model
  • Team features gated
  • Lower fidelity than Runway/Kling
  • Still rough on complex scenes
  • 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.S-tier for solo + free. The best free option, hands down.A-tier for social/casual. B-tier for serious work. Good entry point.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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