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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
OpenRouter
S
Recraft
S
Leonardo.ai
A
TaglineRun any open-source AI model with an API call.One API, every model. Pay-as-you-go, no subscriptions.Vector + raster AI for designers. Actually controls the output.Gamer + creator image gen with model fine-tuning built in.
CategoryDev PlatformDev PlatformImageImage
PricingPay per second of computePay per token — model-dependentFree + $12-$48/moFree + $12-$60/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Developers experimenting across models. Apps that want fallback logic.Designers, brand teams, anyone needing vector output or tight style control.Indie game devs, illustrators, anyone training custom style models.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Exports SVG vectors — rare in AI image gen
  • Strong style control + consistency
  • Brand kit for consistent outputs
  • Train your own models on your style/character
  • Great for game art + concept art
  • Generous free tier
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Slight markup over direct API
  • Some provider features not exposed
  • Less hyped than Midjourney
  • Learning curve for non-designers
  • General output behind Midjourney
  • Can be overwhelming
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for model-shopping. I use this for every prototype before committing.S-tier for designers. The only one that takes vectors seriously.A-tier for creators training custom looks. B-tier for general use.
LinkOpen →Open →Open →Open →