Open World Clock
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Privacy policy

Last updated 25 September 2026

The short version: the Open World Clock apps collect nothing. Your settings stay on your device, the apps work offline, and they make no network requests of their own. This website counts visits with cookieless, anonymous analytics, and skips them entirely if your browser sends Do Not Track or Global Privacy Control. Ko-fi loads only if you click Support the creator.

Open World Clock is a desktop application for Windows that shows the current time in the time zones you choose and converts times between them. An iPhone app with widgets is in development; it has its own section below.

Data the app collects

None. Open World Clock does not collect, transmit or share any personal data, usage data or telemetry. There is no account and no sign-in.

Data stored on your device

Your choices are saved in a local settings file inside your Windows user profile:

  • The cities you add and their order, and any custom labels you give them.
  • The working hours and workdays you set per city for the meeting planner.
  • Your layout (strip, compact or vertical) and language, plus theme, 12 or 24-hour clock, seconds, opacity, always on top, launch at login, zoom level, the window's position and the size you gave each view.

This file never leaves your device. Uninstalling the Microsoft Store build removes it. Uninstalling the installer build keeps it (in the Open World Clock folder under AppData\Roaming) so your cities survive a reinstall; delete that folder to remove it.

Network access

Time zone rules are built into the app, and sunrise and sunset are calculated on your PC, so clocks, conversions and day and night all work fully offline.

  • Installer build (the setup .exe from this site or GitHub): makes no network requests. Automatic update checks are turned off until the installer is code-signed, so to update, download the new version here. If a future signed release turns update checks on, this page will say so first; the check would only ask the project's public GitHub Releases feed for a newer version, with no personal data, settings or identifiers beyond what any HTTPS request to GitHub carries, such as your IP address, which GitHub handles under its own privacy policy.
  • Portable build: makes no network requests and never updates itself.
  • Microsoft Store build: makes no requests of its own; the Store handles updates.
  • Settings has Website, Report a problem and Check for updates links. They only open the page in your browser; the app itself sends nothing. The Report a problem link fills in the app version and build (Installer, Portable or Microsoft Store) on the GitHub form, and you see and can change that before anything is sent.
  • Copy times puts the times on the clipboard as text and as a small table. Save calendar invite writes an .ics file only where you pick in the save dialog. Neither sends anything anywhere.

Third parties

The app includes no third-party services, analytics, crash reporting or advertising SDKs. The sections above are about the Windows app. The iPhone app has its own section next, and the last section is only about this website.

iPhone app and widgets (in development)

The iPhone app and its widgets make no network requests. There is no account, no analytics and no ads, and the app does not ask for location permission: your home city comes from the iPhone's own time zone setting.

Your cities and their order, custom names, working hours, 12 or 24-hour clock, seconds, theme, language and the temporary +1 h shift you set from a widget are saved on your iPhone, in storage shared only between the app and its own widgets (the App Group group.io.joao.worldclock.shared). This data never leaves your iPhone. Deleting the app deletes it.

This website

Everything above is about the apps; this section is only about the website.

This website (not the apps) uses PostHog analytics to count visits and learn which parts of the page are useful. It is set up to be anonymous:

  • No cookies and no analytics identifiers in your browser's storage. PostHog counts visitors with a one-way hash it computes on its servers from your IP address, browser user agent, this site's name and a random value that changes every day and is then deleted, so a visit cannot be linked to you or to your visits on other days.
  • Through our own domain. Your browser only talks to this site. We forward the analytics requests to PostHog and strip any cookies on the way. PostHog uses your IP address for that hash and a rough country, and our PostHog project is set to discard IP addresses instead of storing them (a PostHog project setting, "Discard client IP data").
  • What is recorded: the pages you view and their language (English, Portuguese or Spanish), how far you scroll, which sections come into view, and clicks on a few controls (the download buttons, the converter demo, FAQ questions, the theme button and Support the creator). Never what you type, no session recordings, no time zone, and web addresses are trimmed to the page itself, apart from any utm_ campaign tags in the link you followed.
  • Do Not Track and Global Privacy Control: if your browser sends either signal, the analytics script does not load at all.

Ko-fi. The Support the creator button and links are for tips through Ko-fi. Nothing from Ko-fi loads when you view the page: no script, frame or cookie. Only if you click one of them does your browser load Ko-fi's panel (or open ko-fi.com), and from then on Ko-fi's privacy policy applies to what you do there. We only count that the button was clicked, as described above.

The web app. The web app runs right on the home page, openworldclock.com. It is the Windows app running in your browser. Your cities and settings are kept in your browser's local storage and never sent anywhere; clearing this site's data in your browser removes them. The app loads no analytics of its own: the visit to the home page is counted as described above, and nothing you type or choose inside the app is recorded. A link made with Share carries its cities and time after the # sign, a part of the address that browsers never send to a server, and the analytics drop it too.

Nothing else is loaded from other servers. The live demo reads your time zone inside your browser and never sends it anywhere. If you pick a light or dark theme, or a language, that choice is kept in your browser's local storage.

Contact

Questions about this policy: [email protected]

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