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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
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Genspark
A
Devin
A
TaglineRun any open-source AI model with an API call.Vector + raster AI for designers. Actually controls the output.AI agent for deep search. Generates Sparkpages — full mini-reports.Cognition Labs' autonomous coding engineer.
CategoryDev PlatformImageResearchAgents
PricingPay per second of computeFree + $12-$48/moFree + $25/mo Plus$500/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Designers, brand teams, anyone needing vector output or tight style control.Travel planning, shopping comparisons, deep research where you want an artifact back.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
  • Exports SVG vectors — rare in AI image gen
  • Strong style control + consistency
  • Brand kit for consistent outputs
  • Sparkpages = curated multi-source mini-articles
  • Agent can book, compare, shop
  • Autopilot agent for long tasks
  • 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 hyped than Midjourney
  • Learning curve for non-designers
  • Early-stage — rough edges
  • Less reliable than Perplexity for simple questions
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for designers. The only one that takes vectors seriously.A-tier. Bet on this one — the Sparkpage format is genuinely new.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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