Credits & licenses

Every puzzle is a black-and-white silhouette derived from a source picture. Those source pictures come from two places. Most are public-domain (CC0) clip art — primarily from ClipSafari (clipsafari.com), a CC0 clip-art repository — which places no restriction on reuse and requires no attribution; we credit it here anyway as a matter of good practice. The rest are original icon designs drawn specifically for this site.

In both cases, what ends up in a puzzle is a new 1-bit silhouette generated by our own pipeline, not a copy of the original file (see "How we make our nonograms" for the full process). If you are the author of a source image and believe it was used in a way it shouldn't have been, contact us and we'll remove it.

The interface uses Geist and Geist Mono, an open-source typeface family by Vercel, distributed under the SIL Open Font License (OFL) 1.1. The OFL permits use, embedding, and modification, and requires only that the fonts themselves not be sold on their own — which is not something this site does.

The difficulty analysis and uniqueness guarantees behind our puzzles draw on published academic work on nonogram solving, which we cite directly rather than paraphrase. Key sources include Batenburg & Kosters' work on solving and difficulty (the (p,q)-SOLVER family), Ortiz-García et al. on automatic nonogram generation, and Roucairol & Cazenave on difficulty modelling. Those references are discussed in context on the solving guide and the "How we make our nonograms" page.

The site is built with Next.js and a number of open-source libraries, each used under its own license. Image processing relies on sharp (Apache-2.0). We're grateful to the maintainers of every open-source project that made this possible.

We take attribution seriously. If you spot artwork, a font, or any other material that you think is used incorrectly or without proper permission, please get in touch through the contact page with a link or description, and we'll review and fix it promptly.