Privacy Policy
Short version: the tools on CronLens run in your browser. What you type or paste into them is not sent to us.
This policy has not yet been reviewed by a lawyer.
Effective date: 2026-10-01
Who is responsible
The data controller is CronLens, an independent project operated from Indonesia. We have no postal address to publish; contact is by email only, at joe@zona13.net.
Your inputs stay in your browser
All tools on this site are client-side. The cron expressions, time zones and dates you enter are processed by JavaScript running on your device. They are not transmitted to our servers and are not logged by us. The pages are static files and the site has no back end that accepts input. Nothing you type is sent to any third party either.
The share link
The tool writes your expression, dialect and time zone into the address bar after a # sign (the URL fragment) so you can copy a link. Browsers do not send the fragment
to a web server, so it is not part of the request that reaches us. If you paste that link into a chat, email or document, the people and services you give it to can read it.
What is stored in your browser
The tool uses your browser's local storage, on your device only, with two keys. Neither is a cookie and neither is read by us.
cronlens.history.v1: the list of expressions you checked (dialect, expression, time zone, whether you pinned it and when). A valid expression is added automatically about a second and a half after you stop typing, and by the Save button. The History panel can delete single entries or clear all.cronlens.tz.v1: the last time zone you used, so the next visit starts there.
You can erase both with the Clear history button (history only) or in your browser's site-data settings (both). If your browser blocks local storage, the tool still works and simply keeps nothing.
Server logs
Like any website, our web server receives your IP address, the page requested, the time and your browser's user-agent when you load a page. These technical logs are used for security and to keep the site running and are kept for about 14 days and then deleted automatically (the log files are rotated daily and the 14 most recent rotated files are kept). They are used only for security and for aggregate traffic statistics. The access log lines contain the IP address, the time, the requested URL, the response status, the number of bytes sent, the referring page if your browser sends one, and the user-agent. The server's error log can also contain IP addresses and URLs; they do not contain anything you type into the tools. The site is hosted on a virtual private server from Linode (Akamai Cloud), in a data centre in the United States (New Jersey). That means your request, including your IP address, is processed in the United States.
Analytics
This site does not currently use analytics. If that changes, this page will be updated first.
Advertising, cookies and consent
This site does not currently show advertising and does not set advertising cookies.
The tools themselves never pass what you type to advertisers. Ads are never required to use a tool.
Cookies
This site sets no cookies of its own. The only data it keeps on your device is the two local storage keys listed above, which have no expiry and stay until you delete them. The web server does not set cookies either (checked on the live site).
Your rights
Depending on where you live (for example under the GDPR or UK GDPR) you may have the right to access, correct or delete personal data we hold about you, to object to or restrict processing, and to complain to your data protection authority. Because we hold very little data about visitors (see above), the practical scope is small, but you can email us to ask. We process the technical log data on the basis of our legitimate interest in running and securing the site. The operator is based in Indonesia, so Indonesian law, including the Personal Data Protection Law (Law No. 27 of 2022), applies alongside any rights you have where you live.
Children
This site is not directed at children under 13 and we do not knowingly collect their personal information.
Changes to this policy
If this policy changes we will update the date at the top of the page.