Privacy
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What stays on your device
The options you pick are remembered only in your browser on this device, so the page opens the way you left it. Clearing the site's data deletes them.
What goes to the server
The image address contains your options: the screen size, the dates of a countdown, its name, any marked days and your time zone. The server draws the picture from them and keeps nothing. The hosting provider (Vercel) may keep standard request logs, which include that address, for a short time. Leave the name empty if you would rather it not appear there.
The map background
If you choose the map, the server needs a place to draw. Either you fix one, and it is part of the address rounded to about a kilometre, or your Shortcut sends the device's position each night, rounded the same way. With neither, the place is guessed from your internet connection. The server asks OpenFreeMap for the map tiles of that area and keeps nothing. Map data © OpenStreetMap contributors.