Privacy Policy — Cron Job Calculator
Last updated: 25 August 2026
Cron Job Calculator (com.tahatec.cron_job_calculator) is an Android app published by Tahatec. This policy explains what the app does and does not collect.
The short version
Every expression you type is parsed and every run time is computed entirely on your device, against a time-zone database bundled inside the app. None of it is uploaded, and there is no account, no sign-in and no server belonging to this app. The app does show ads and does report anonymous usage and crash data, and that is described in full below.
What stays on your device
The expression you are editing, and the command name you type on the Export tab.
Schedules you save, including the names you give them.
Your recent-expression history.
Your settings: theme, clock format, the time zone you chose, the cron dialect, and how many runs to list.
These are stored in the app's own private storage and are removed when you uninstall the app or clear its data from Android's app settings.
What is collected, and by whom
The app uses three Google services. Each has its own privacy policy, linked below.
Service What it receives Why
Google AdMob (with Meta Audience Network mediation) Your device's advertising identifier, approximate location derived from your IP address, and standard device and ad-interaction information. To select and measure the ads shown in the app.
Google Analytics for Firebase Anonymous usage events, an app-instance identifier, and general device and country information. To see which features are used, so effort goes to the right ones.
Firebase Crashlytics Crash stack traces, the device model and OS version, and an installation identifier. To find and fix crashes.
What the analytics events never contain: your cron expression, the command you type beside it, the names of your saved schedules, the specific time zone you selected, or the contents of your clipboard. Where a measurement would otherwise reveal content, only a shape is recorded — for example how often a schedule runs as a band such as "sub-hourly", or a run count as a bucket such as "1k–100k" — never the expression itself. The time zone is reported only as its region, such as "Asia" or "Europe", because a full zone name is a location.
Notifications
The app can send occasional announcements through Firebase Cloud Messaging. These are off until you turn them on in Settings, and they are sent to everyone who has opted in — the app does not target individual devices. Turning the system notification permission off stops them.
Ad personalisation and consent
If you are in the European Economic Area, the United Kingdom or a US state with applicable privacy legislation, the app asks about ad personalisation using Google's User Messaging Platform before requesting any personalised ad. You can change that answer at any time from the privacy options in Settings, where the option is offered.
Children
The app is a developer utility and is not directed at children. It does not knowingly collect information from children under 13.
Your choices
Remove everything the app has stored: uninstall the app, or use Android Settings → Apps → Cron Job Calculator → Storage → Clear storage.
Reset your advertising identifier: Android Settings → Privacy → Ads.
Opt out of personalised ads: in the same Android Ads settings, or through the consent options in the app where offered.
Ask about the data held by the services above: contact us using the address below, and we will pass the request on.
Third-party policies
Google Privacy Policy (AdMob, Analytics for Firebase, Crashlytics)
How Google uses information from sites or apps that use its services
Meta Privacy Policy (Audience Network mediation)
Changes
If this policy changes, the date at the top of this page changes with it. A change that affects what is collected will also be described in the app's release notes.
Contact
Questions about this policy:
tahatec@yahoo.com