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Tools · Comparison

FLUX vs Leonardo Phoenix vs Stable Diffusion

All three are image generation tools. Here is what separates them.

FLUXLeonardo PhoenixStable Diffusion
What it isBlack Forest Labs’ open-weight image models, the current default for anyone building generation into a product.Leonardo’s in-house model, aimed at prompt adherence and legible text for production work.Stability AI is the enterprise-ready creative partner for teams and creators, delivering professional-grade generative AI tools and solutions for content production at scale.
CategoryImage GenerationImage GenerationImage Generation
PricingFreemium · Free (self-hosted) · API from $0.003/imageFreemium · Free credits · from $10/moFree · Free (self-hosted)
How it billsFlat monthlyUsage-basedFree
Free tierYesYesYes
RatingNot yet ratedNot yet rated4.4 from 5,200 reviews
Features
  • Open weights for several variants
  • Strong text rendering inside images
  • High prompt adherence
  • Fine-tunable
  • Cheap API for the hosted variants
  • High prompt adherence
  • Reliable text in images
  • Reference image and pose control
  • Canvas editor with inpainting
  • Daily free credits
  • Open-source model
  • Local execution
  • LoRA fine-tuning
  • ControlNet support
  • ComfyUI workflows
  • Inpainting & outpainting
  • Model merging
  • Community models
What works
  • Can be run entirely on your own hardware
  • Best-in-class at text in images
  • Very cheap per image via API
  • Built for repeatable production output
  • Strong control features
  • Daily free credits
  • Completely free to use
  • Full customization
  • No content restrictions
  • Large community
  • Runs locally
What does not
  • No polished consumer interface
  • Local use needs a capable GPU
  • Licence terms differ per variant
  • Less striking than Midjourney at its best
  • Credit maths is confusing
  • Interface is busy
  • Requires GPU hardware
  • Complex setup
  • Steeper learning curve
  • Quality varies by model
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