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A wrong number is worth reporting

The tools that calculate something are the ones I most want to hear about. If a figure here disagrees with a payslip, an official calculator or a number your accountant gave you, tell me which tool, what you entered and what you expected — that is enough to reproduce it.

This is not a hypothetical request. A calculator on this site once returned 4 for -2^2, and a barcode scanner once returned nothing at all for every image it was given. Both shipped looking perfectly healthy. Reports are how that gets found.

Requesting a tool

Suggestions are welcome, with one constraint worth knowing in advance: everything here has to run inside the browser. If a task needs a server, a licensed dataset or an API key that would have to be paid for per request, it cannot live on this site, however useful it would be. Anything that is arithmetic, text manipulation, file surgery or image work is fair game.

Privacy, ads and takedowns

Questions about what the site stores or which third parties are involved are answered on the privacy policy page, and anything it does not cover can be sent to the address above.

If you believe something published here infringes your copyright, write with the URL and enough detail to identify the material, and it will be removed while the claim is looked at rather than after.

What to expect

This is a side project, so replies are measured in days rather than hours, and a stretch of silence usually means a busy week rather than a lost email. A bug in something that returns a number gets looked at first.