About Zaptool

Zaptool is a small, independent collection of free developer tools — a cron expression generator and explainer, a chmod permission calculator, and a growing set of everyday utilities for people who work in a terminal.

Everything here runs entirely in your browser. There is no account to create, nothing to install, and no paywall. We build each tool to answer one practical question well — "what is the cron expression for every 15 minutes?", "what does chmod 755 actually mean?" — and to show the answer, the reasoning, and the gotchas on a single fast page.

Why it exists

Most reference pages for these topics are either a wall of theory or a bare calculator with no explanation. Zaptool tries to sit in the middle: give you the exact command to copy, a plain-English explanation, and the real-world pitfalls — so you can get the thing done and move on.

Who runs it

Zaptool is built and maintained by an independent developer. It is not affiliated with any other site or brand. The source that generates these pages is public on GitHub.

How it's funded

Zaptool is free to use. To cover hosting and keep the tools free, some pages may display advertising. See our Privacy Policy for how advertising and analytics cookies are used.

Questions or corrections? Get in touch.