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Leonardo.Ai vs Stable Diffusion

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. Leonardo.Ai publishes a starting price ($8.33); Stable Diffusion does not. Both have a free tier. Both ship a public API.

Leonardo.AiToken-metered image workspace with fine-tuned model presetsStable DiffusionOpen-weight image models, free to run below $1M revenue

Side by side

FactLeonardo.AiStable Diffusion
CategoryText-to-Image GeneratorsText-to-Image Generators
Pricing modelFreemiumFreemium
Starts at$8.33 month—
Public APIYesYes
PlatformsWeb, API, iOS, AndroidAPI, Web, Windows, macOS, Linux
CompanyCanvaStability AI
Launched20222022
Last verifiedSep 6, 2026Sep 6, 2026

What our research says

Leonardo.Ai

Leonardo is the generator to pick when you need control over the model rather than one house style, and it is the only major one with a real API and custom training. Token accounting is the tax you pay for that flexibility.

Pros

  • Large library of fine-tuned model presets instead of a single opinionated model
  • Custom model training on your own images is available without an enterprise contract
  • A genuine documented API, which the obvious competitor still does not have
  • Free tier of 150 daily tokens is enough to evaluate properly

Cons

  • Token costs differ by model, resolution and feature, so per-image cost is hard to predict
  • 150 free tokens go in roughly ten generations
  • Concurrency and queue position are tier-gated, so cheap plans wait
  • Roadmap now serves Canva's product priorities, not standalone power users

Stable Diffusion

The reason a local generation ecosystem exists at all, and still the right answer when you need weights on your own hardware with no per-image meter. Just be clear about what you are adopting: the models are open, the licence is not unconditional, and Stability's own commercial attention has moved to a hosted brand-asset app that happily routes to competitors' models.

Pros

  • Weights genuinely run locally, so cost per image after hardware is electricity
  • The community licence explicitly permits derivative LoRAs and fine-tunes
  • An enormous body of community checkpoints, tooling and interfaces exists around these models
  • Hosted API pricing is per image and published, from $0.025 to $0.08 depending on model

Cons

  • The $1M revenue threshold turns a free licence into a quote-only negotiation with no public price
  • stability.ai/pricing no longer describes model access at all — it redirects to Brand Studio
  • Brand Studio credits do not roll over between months
  • Running locally means owning the GPU, the updates and the safety tooling yourself

Which one fits

Choose Leonardo.Ai if you need

  • Game and product teams that need consistent assets from a fine-tune they control
  • Anyone who wants generation, canvas editing and upscaling in one place
  • Developers who need image generation behind an API rather than a chat window
  • Users who want to train a model on their own reference set

Choose Stable Diffusion if you need

  • Developers and studios that need generation on their own infrastructure with no per-call cost
  • Anyone fine-tuning or training LoRAs on a specific style, product or character
  • Privacy-sensitive or offline workloads where images cannot leave the building

More comparisons

All Leonardo.Ai alternatives →All Stable Diffusion alternatives →Browse all Text-to-Image Generators →