cassam.dev is a growing network of free, single-purpose tools: a word unscrambler, a QR code generator, a password generator, a word counter, a percentage calculator and more on the way. Each one is built to load fast, do one job properly and get out of your way.

The site has one rule that everything else follows: everything runs in your browser. There is no backend doing the work, no account system and no upload step. Your letters, passwords, drafts and numbers are processed on your own device and never transmitted. For most tools you can load the page, go offline and keep working.

That rule is not a slogan, it is the architecture. The site is a set of static pages served from a CDN. The word lists, code and styles arrive as files; after that, the page needs nothing from us. It also means the tools are honest about their limits: a static QR code cannot count scans, a local strength checker cannot look up breach databases, and the pages say so.

The site is built and run by Wolds Cyber Ltd, a UK cyber security company (registered in England and Wales, company number 17143627). Building things this way, minimal data, local processing, no dark patterns, is the same approach we bring to security work.

Spotted a wrong answer, a missing word or a tool you wish existed? Get in touch, the site improves fastest when people point at the broken bit.