Quartz · Privacy policy
Your browsing never leaves your browser.
Your list of sites, your limits and your time stay on your machine. Quartz sends one thing: anonymous counts of how the extension itself is used, under a random number generated on your own machine, never including a website address of any kind. Turn them off in settings and nothing leaves at all.
Last updated: 5 August 2026
What Quartz stores, and where
Everything below is stored in your own browser using chrome.storage.local.
None of it is transmitted, synced, backed up or shared.
- The list of sites you have added, and the daily allowance you set for each.
- How many seconds you have spent today on each of those sites, how many times a site's blocked page has been shown today, and how much extra time you have taken.
- Your streak of clean days.
- Your settings: the warning threshold, and how much extra time you allow yourself.
- The state of the settings lock, so a pending five-minute wait survives closing the tab.
- A random identifier, used only to group the usage counts described below.
The per-day usage record is deleted when the day rolls over at your local midnight.
What Quartz reads
To count time and to block a site, Quartz needs to know which site is in the foreground. It reads the hostname of the tab currently in front, and compares it against your list.
Quartz does not read page content, text, images, form fields, passwords or your browsing history. It stores no URLs and no page titles. It records nothing at all about sites that are not on your list.
A small timer script is injected into the tabs of sites on your list. It reports how long the tab has been in the foreground, whether audible media is playing, and draws the "5 min left" notice. It reads nothing else from the page.
What Quartz reports
Quartz sends anonymous usage counts to PostHog, an analytics provider, so that we can tell whether the extension is working: whether setup completes, whether limits are actually reached, and whether the friction guarding extra time holds. Processing happens on PostHog's servers in the European Union.
No website address is ever included. Not one you typed in, and not one of the suggested sites either. An event records that an allowance ran out, how long that allowance was, and whether a streak ended. It never records which site it was about.
What a report can contain:
- Which step of setup was reached, and whether site access was granted.
- That a site was added, removed, or had its allowance changed, with the number of minutes and whether the change was stricter or looser.
- That an allowance ran out, that a blocked page was shown, that the tab was closed, and that extra time was requested, abandoned partway, or taken.
- That settings were unlocked, or that a change was refused by the lock.
- Once a day: how many minutes were spent on limited sites the previous day, how many blocks and how much extra time there were, and the length of your clean-day streak.
- Aggregate counts describing your setup: how many sites are on your list, how many are set to Never, and the total minutes of allowance in a day.
- Which screen an event came from, and the extension's version number.
What a report never contains: a website address, a URL, a hostname, a page title, a search, anything you type into the extension, your name, your email address, your location, or any identifier that came from anywhere other than the random number generated on your own machine.
Quartz does not use cookies, does not fingerprint your device, and does not record your screen or your session.
Turning reporting off
Open Quartz's settings and set Anonymous usage stats to Off. Reporting stops immediately, everywhere in the extension, and nothing further is sent. Everything else works exactly the same either way.
Site icons
The icons shown next to your sites come from Chrome's own local favicon cache. They are not requested from Google's icon service or any other third party, specifically so that displaying your list never reveals its contents to anyone.
Third parties
One: PostHog, which receives and stores the anonymous counts described above, on servers in the European Union. Nobody else receives anything. Quartz contains no advertising and no third-party tracking code.
Data sharing and sale
Quartz does not sell, rent or trade user data, and does not share it with anyone beyond the single provider named above. The counts are not used to build a profile of you, are not combined with data from anywhere else, and are not used for advertising.
Deleting your data
Uninstalling Quartz from chrome://extensions removes everything stored in
your browser, including the random identifier. Nothing further is sent, and nothing
already sent can be connected to you afterwards.
If you want the counts already sent under your identifier deleted, the identifier is shown at the bottom of the Privacy section in Quartz's settings. Email it to the address below and everything recorded under it will be deleted.
Children
Quartz is not directed at children.
Changes to this policy
If Quartz ever changes in a way that affects this policy, the policy will be updated before that version is published, and the date at the top will change.
Contact
Questions about this policy, or a deletion request: demidchick.pavel@gmail.com