Side by side
FLUX (Black Forest Labs) vs Stable Diffusion (Stability AI)
A fact-based comparison built only from each tool's verified directory profile — pricing summaries, plan availability, platforms, and stated strengths and limitations. No rankings, no sponsored placement.
| Criterion | FLUX (Black Forest Labs) | Stable Diffusion (Stability AI) |
|---|---|---|
| Category | AI Image Generators | AI Image Generators |
| In one sentence | Black Forest Labs' FLUX image models, available through an API, a playground, and open-weight licences you can self-host. | Stability AI's open-weight image models, also available through a credit-based API. |
| Problem it solves | Getting a state-of-the-art image model either as a hosted API or as weights you can run and fine-tune on your own infrastructure. | Teams that need control, privacy or customisation cannot always use closed cloud generators; Stable Diffusion can be self-hosted and fine-tuned. |
| Free plan | No | Yes |
| Developer API | Yes — docs | Yes — docs |
| Open source | Yes | No |
| Platforms | Web, API, Linux, Windows | Windows, Linux, macOS (local), API |
| Pricing (summary) | API access is pay-as-you-go with a published per-image calculator and no subscription; open-weight use requires a paid licence tier (Builder, Platform, Professional or Enterprise). Verify current rates on BFL's pricing page. Checked 2026-10-18 | Model weights are free under the Stability Community Licence for individuals and organisations under $1M annual revenue; larger companies need a custom Enterprise licence. The hosted API is pay-as-you-go at $0.01 per credit with a small starter credit grant. Checked 2026-10-19 |
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How to choose
Both profiles link to the vendors' official pricing — plan details change often, so verify there before buying. Pick based on the criterion rows above that matter to your workflow, not on rankings: we don't rank tools, because the right choice depends on your needs.