About Klein Studio

Klein Studio (flux3klein.org) is an independent, unofficial website run by Zehong Liu, an independent developer. This site is not affiliated with, endorsed by, or sponsored by Black Forest Labs. The FLUX and Black Forest Labs names are used here only for necessary attribution and descriptive reference.

How the site works

This web tool provides browser access to the FLUX 3 Klein (FLUX 3 Image Klein) model by sending requests to the API of Black Forest Labs, the company that makes the model. You can generate new images from text prompts or upload a single image to edit it with text instructions.

How it is paid for

Every visitor receives 3 free images per day at 1K resolution without creating an account. To cover API and server costs, we sell one-time image credit packs with no recurring subscription. Payments are processed through Waffo, which acts as our merchant of record. You can read the full details on our pricing page.

Safety and moderation

Every request passes up to three automated checks of our own: (1) the prompt is checked against a list of blocked terms that we update over time; (2) when you edit a photo, the image you upload is checked before it is sent to the model; (3) every finished image is checked before it is shown. The model also has its own safety filter, built into Black Forest Labs’ API. If one of our checks cannot give an answer, the request is refused.

A refused request uses no credit. If the prompt or the uploaded image is refused, no free image is used either; if our check holds back a finished image, a free image still counts as used, because the model ran. Every refusal is recorded in a moderation log with the stage, the kind of content, the rule that refused it and the time. Images are never stored in the log. How long the log is kept is listed in our privacy policy. Please also review our acceptable use policy.

Contact

If you have questions about the site, your credits, or a refund request, email support@flux3klein.org.