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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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S
Framer
A
Manus
S
Devin
A
TaglineRun any open-source AI model with an API call.Design + publish sites with AI assists built in.Autonomous AI agent that actually finishes tasks.Cognition Labs' autonomous coding engineer.
CategoryDev PlatformDesignAgentsAgents
PricingPay per second of computeFree + $5-$30/moFree tier + $39-$199/mo$500/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Designers shipping marketing sites without engineers.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • AI generates sections + copy + layouts
  • Designer-first publishing (not just templates)
  • Great animations
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Less flexible than raw code
  • Pricing per-site adds up
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier for designer-led sites. S-tier if animations matter.S-tier in the agent category. The first one I'd give to a non-technical friend.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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