Privacy
Dadvah has no accounts, no analytics and no advertising.
On your device
Your settings and your personal events are kept only on your device, in the app or in this browser's storage. They are never sent to us.
Calendar updates
Once a day the app downloads the latest event list from data.dadvah.com; it looks for a new version of itself only when you ask it to, in Settings. These requests carry nothing about you, but like any request on the internet they reveal your IP address to the server that answers.
Feedback
If you send feedback, we store what you write, your name and e-mail address if you give them, and the app's version, your operating system and language. To limit abuse, we keep a keyed hash of your IP address for one hour, never the address itself.
Server logs
Our web servers log each request: the network part of your IP address (with its last part removed), the time and the page. Only when a request is refused or fails can the full address appear in an error log. Logs are kept to run the service and to stop abuse, and are overwritten as new ones arrive; at today's traffic that is within about six weeks.
Backups
Our database, the calendar's content and any feedback sent to us, is backed up every night, with an encrypted copy off the server. Backups are kept for eight weeks, so anything deleted is gone from them within eight weeks.
Cookies
This website sets a cookie only if you choose the Iranian (Imperial) year count, on the home page or in the calendar's settings: dv-era, which holds that choice and nothing else, and is removed when you switch back. Our editors' sign-in to the admin area uses its own cookie.
Contact
For questions about your data, or to have feedback you sent deleted, write to privacy@dadvah.com. We answer within 30 days.