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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
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Image
Video
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Meetings
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Productivity
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Writing
Agents
Dev Platform
Data
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Replicate
S
Lex
A
Kling
A
Fathom
S
TaglineRun any open-source AI model with an API call.Google Docs with an AI collaborator baked in.Kuaishou's video model. The surprise standout.Meeting notes, free forever for individuals.
CategoryDev PlatformWritingVideoMeetings
PricingPay per second of computeFree + $12/moCredit-based, free trialFree for individuals + $15-$29/user/mo teams
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Essays, long-form drafts, thinking on the page.Anyone who wants top-tier video quality for less.Solo operators, freelancers, small teams on a budget.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Very strong motion + physics
  • Often beats Runway on realism
  • Great price
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • UX is rough for English speakers
  • Queue times
  • Bot-joining model
  • Team features gated
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.A-tier. Rising fast. If you can tolerate the UX, quality per dollar is best-in-class.S-tier for solo + free. The best free option, hands down.
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