About Ten Eleven

Ten Eleven is the top-level index for a small family of free, no-signup web tools, built and maintained by Joe Koppin, a software engineer. This page itself doesn't do anything, it links out to Helpful Tools (a directory of 6 developer, converter, calculator, and text tools sites) and Fun Puzzles.

Every site in the family shares the same philosophy: free, no accounts, no subscriptions, and wherever the tool allows it, entirely client-side, so what you type into a calculator or converter stays in your browser instead of going to a server. See each site's own Privacy Policy for its specifics, and its About page for more on what it does.

The sites are ad-supported. If one saved you time, a coffee is always appreciated but never required. Questions or feedback can go to privacy@tenelevenonline.com. See the Privacy Policy and Terms of Use for this site specifically.