Cookie policy

Last updated: 6 November 2026

zet4u.com uses as little as possible. Google Analytics cookies are set only if you agree. Everything else is stored in your own browser so the site can remember your choices and work offline; none of it is used to track you.

Necessary storage (always on)

NameTypePurposeKept for
zet4u-consentLocal storageRemembers your cookie choice.12 months
zet4u-offline-state, zet4u-offline-infoLocal storageNotes which files are saved for offline use and when they were last checked.Until you clear site data
zet4u-pages-v1, zet4u-files-v1Cache storageThe offline copy of the site's pages and files.Until you clear site data
zet4u-xoLocal storageYour tic-tac-toe settings and scores.Until you clear site data

Analytics cookies (only with your consent)

NameProviderPurposeKept for
_gaGoogle AnalyticsTells one browser from another, to count visits.13 months
_ga_*Google AnalyticsKeeps the state of the current visit.13 months

We send Google only the page address, never what you type into a calculator. Google Signals and ad personalization are off. More in our privacy policy.

Changing your choice

Use – the same link is at the bottom of every page. If you withdraw consent, Google Analytics stops loading and its cookies are deleted. To remove everything, clear this site's data in your browser settings.

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Cookie settings

Put zet4u on your home screen

It opens like an app, and the calculators and games keep working with no internet – even on a plane. Free, no account.

  1. In Safari, tap Share (the square with the arrow pointing up). If you don’t see it, tap ⋯ first.
  2. Scroll down and choose Add to Home Screen.
  3. Tap Add. The zet4u icon appears next to your other apps.

In Chrome on iPhone, Share is at the top, next to the address bar.