Privacy Policy

Last updated: July 2026

GlassClock is built to work with as little data collection as possible. This page explains exactly what does and doesn't happen when you use it.

The short version

No account, no sign-up, no forms. GlassClock doesn't send anything you type or select to a server. The few preferences it remembers (your world clock list, your chosen theme) are stored only in your own browser, on your own device.

What's stored on your device

GlassClock uses your browser's localStorage — not cookies — to remember a small set of preferences between visits, entirely on your own device:

Which cities you've added to your World Clock list, and which one is currently selected
Your light/dark theme preference
Any custom clock/text color or background hue you've chosen
Whether you've already seen the one-time notice about battery saver mode affecting the screen-stay-awake feature

None of this is transmitted anywhere. It never leaves your browser, and we have no way to see it. Clearing your browser's site data for GlassClock removes all of it.

Browser permissions

GlassClock may ask your browser for two permissions, both optional and both used only for the feature they're named after:

Notifications — requested only if you start a countdown timer, so we can alert you when it finishes even if you've switched to a different tab. Declining this doesn't stop the timer from working; you'll just rely on the in-page alert and sound instead.
Screen Wake Lock — used automatically to keep your screen from sleeping while GlassClock is open, since it's often used as a visible desk clock or an active timer. This doesn't require a permission prompt and doesn't collect any data — it's purely a display setting.

Advertising

GlassClock is built to support a single, unobtrusive ad slot served through Google AdSense. As of this writing, that slot is inactive — no ads are currently being shown, and no advertising-related data is being collected.

If and when it's activated, Google AdSense may use cookies and similar technologies to serve and measure ads, which can include information about your visit for the purpose of ad personalization. You can control ad personalization directly through Google's Ads Settings, and opt out of personalized advertising generally through the Digital Advertising Alliance. This policy will be updated with more specific detail before that slot is turned on.

Fonts

GlassClock loads the Inter typeface from Google Fonts. Loading any web font involves a request to the font provider's servers, which may log standard technical information like your IP address, as is normal for any web request — Google Fonts does not use this to track you across other sites.

Children's privacy

GlassClock is a general-audience utility and is not directed at children under 13. We don't knowingly collect personal information from anyone, including children, because we don't collect personal information from anyone at all.

Changes to this policy

If GlassClock's data practices change — most likely when the ad slot above is activated — this page will be updated and the "last updated" date at the top will reflect that.

Contact

Questions about this policy can be sent through the GlassClock feedback channel.