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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
Windsurf
A
Sora
A
Reflect
A
TaglineRun any open-source AI model with an API call.Codeium's agentic IDE. Cascade agent + strong free tier.OpenAI's video model. Long clips, cinematic quality.AI-powered networked notes. Roam with a brain.
CategoryDev PlatformCodingVideoProductivity
PricingPay per second of computeFree + $15/mo ProIncluded with ChatGPT Plus/Pro$10/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Developers who want Cursor-like power for less money.ChatGPT subscribers experimenting with cinematic shots.Knowledge workers + thinkers who want AI in their second brain.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
  • AI auto-links related notes
  • Generates backlinks + summaries
  • Clean, minimal UX
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Smaller community
  • Model selection more limited
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
  • Expensive for just notes
  • Smaller community than Obsidian
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. Close second to Cursor. If $5/mo matters, start here.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.A-tier. Niche but beloved. If you've outgrown Notion, try this.
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