How it works
There is no clever part, and that's rather the point.
One file. That's the whole thing.
Every tool is a single file you download. You double-click it and it opens in Chrome, Edge, Safari or Firefox — whatever you already have. There is nothing to install, no account to make and no password to invent.
It teaches itself
The first thing a tool does is walk you through it in five short screens with pictures. There's a ? How do I use this button at the top to see it again whenever you like, and a Show me an example button that fills it with realistic numbers so you can watch it work before typing anything of your own.
Your information stays yours
Nothing you type is sent anywhere. The tools have no way to send it — there's no server behind them. You can turn your wi-fi off and they carry on working, which is the simplest proof there is. Press Save and you get a small file on your own computer; press Open to load it back later.
On your phone too
Email yourself the file and open the attachment, or drop the files in iCloud Drive, Dropbox or Google Drive and open them from there. They'll then be on every device you own, without syncing anything to us.
It can't rot
A subscription app stops working when the company changes its pricing or shuts down. A file on your computer doesn't. Buy it once and it's yours, working exactly the same in ten years.