Free AI Image Generator (Truly Unlimited, Open Source, No Watermark)
LiveEvery “free AI image generator” caps out at a handful of images, slaps a watermark on the output, or asks for a card on file eventually. Open Generative AI doesn't — its local desktop mode runs entirely on your own machine using a bundled sd.cpp inference engine, so there's no API key, no signup screen, no watermark, and no cap on how many images you generate. The same app also has a toggle for Muapi's hosted API, giving you access to 600+ additional models (including closed models that can't run locally) under one key, paying only for what you generate.
Watch: Free AI Image Generator Walkthrough
Quickstart
- 1
Download the desktop app
Grab the installer for macOS, Windows, or Linux from the GitHub repo, or use the no-install hosted version at muapi.ai/open-generative-ai. - 2
Open Image Studio → Local mode
Toggle ⚡ Local next to the model selector. The app one-click-installs the sd.cpp inference engine and your chosen model — no API key, no account, nothing installed system-wide. - 3
Type a prompt, generate
Runs on your own machine. No signup screen, no watermark, no image-count cap — generate as many times as you want. - 4
Optional: flip to API mode for more models
The same app has a toggle for hosted API access to 600+ models (GPT Image 2, Z-Image Turbo, Wan 2.7, and more) under one Muapi key — pay only for what you generate, no subscription.
Local mode vs. the 600+ model API tier
| Local (sd.cpp) | API (Muapi) | |
|---|---|---|
| Cost | Free, unlimited | Pay per generation, from $0.007/image |
| API key / account | None needed | Free account + API key |
| Watermark | None | None |
| Model selection | Open-weight models compatible with sd.cpp | 600+ models, including closed models like GPT Image 2 |
| Where it runs | Your own hardware | Muapi's infrastructure |
| Credits | N/A | Never expire, no monthly reset |
Best models on the 600+ tier
If you flip to API mode, these are the standouts by category.
GPT Image 2
Best QualitySits at #1 on the Artificial Analysis text-to-image arena — the highest raw quality in the catalog, no contest.
Z-Image Turbo
Best ValueUnder a cent an image, and also the top open-weights model — the real “make ten variants” model.
Wan 2.7
Least RestrictedBarely filters anything — the pick when you want basically zero content restrictions.
See the full ranked catalog on the AI Image API page.
Frequently Asked Questions
Is it actually free, or free-with-a-catch?
Local desktop mode is genuinely free and unlimited — it runs the sd.cpp inference engine on your own hardware, so there's no per-image cost, no watermark, and no account required. That claim is scoped specifically to local mode. The hosted API tier (600+ models, no local setup) is metered per generation with no free allowance — you pay only for what you generate, from $0.007/image.
Do I need a GPU?
A GPU makes local generation faster, but sd.cpp also runs on CPU. Model choice matters more than raw hardware — smaller models like Z-Image-class checkpoints are usable on modest machines.
What models can I run locally vs. through the API?
Local mode runs open-weight models compatible with the bundled sd.cpp engine. Flip to API mode in the same app for 600+ hosted models under one key, including closed models like GPT Image 2 that can't run locally at all.
Is there a content filter?
Local mode has none — you're running the model on your own machine. On the API tier, filtering depends on the specific model; several endpoints (including Wan 2.7) apply minimal restrictions.
Is this open source?
Yes. The full desktop app is open source on GitHub, and the code doing local inference (the sd.cpp integration) ships in the repo, not as a hidden binary.