Cookie Policy
Last updated: 12 November 2026
This policy explains what Synkro stores in your browser or on your device, and why. "Cookies" here also covers similar technologies such as local storage, browser databases and service workers.
In short: we do not use advertising or cross-site tracking technologies. What we store is used to keep you signed in, to make the app work and to diagnose faults.
Synkro is operated by Epseelon OÜ, Narva mnt 5, 10117 Tallinn, Estonia. Our Privacy Policy explains how we handle personal data more generally.
The website synkro.co
Browsing the website does not set any cookie and does not store anything in your browser. The website does not use analytics, and its fonts and images are served from our own site.
The web app at app.synkro.co
The web app stores the following in your browser.
| What | Set by | Purpose | How long it lasts |
|---|---|---|---|
| Sign-in session (browser database "firebaseLocalStorageDb") | Firebase Authentication (Google) | Keeps you signed in | Until you sign out or clear the site data |
| Technical database "firebase-heartbeat-database" | Firebase (Google) | Lets Firebase report which version of its software is in use | Until you clear the site data |
| App files (service worker and its cache) | Synkro | Makes the app load quickly | Until the app is updated or you clear the site data |
| Preferences in local storage, for example the plan you chose when signing up | Synkro | Remembers your choices | Until you clear the site data |
| Notification registration | Firebase Cloud Messaging (Google) | Delivers notifications, only if you allowed them | Until you turn notifications off |
| Local storage, session storage and database entries starting with "bf_" | Bugfender | Groups the technical logs coming from the same browser, so that we can diagnose faults | Session entries end when you close the tab. The others last until you clear the site data. |
The web app itself does not set any cookie.
Earlier versions of Synkro included a support chat, an analytics tool and a consent banner. If you used Synkro at that time, your browser may still hold what they stored: cookies and local storage entries whose names start with "intercom" or "ajs_", and a cookie named "usprivacy". Synkro no longer uses them. The cookies expire on their own within a year, and you can delete all of it at any time in your browser settings.
When you pay for a plan or open the billing portal, you leave Synkro for pages hosted by Stripe. Stripe uses its own cookies there, including to prevent fraud. They are described in Stripe's cookie policy.
The mobile apps
The iOS and Android apps do not use cookies. They keep equivalent information on your device: your sign-in session, your preferences, a local copy of your events and tasks so that the app keeps working with a poor connection, your scheduled task reminders, a notification token if you allowed notifications, and the identifiers used by our diagnostic logs.
Signing out removes your session. Uninstalling the app removes everything it stored on your device.
How to control cookies
You can delete or block cookies and site data in your browser settings. If you block storage for app.synkro.co, you will not be able to sign in to the web app.
You can turn notifications on or off at any time in your browser or device settings.
Changes to this policy
We will update this page when what we store changes, and revise the date at the top.
Contact
Epseelon OÜ, Narva mnt 5, 10117 Tallinn, Estonia. Email: info@synkro.co.