EU Tracker
Know your Schengen days before you book. Log the trips you have taken, see what is left on the rolling 180-day clock, and check a planned trip before you commit to it.
iPhone. Coming soon.
The 180-day clock, done for you.
The rolling window is awkward to work out by hand. The app keeps count so you do not have to.
Will the next trip fit?
Put in the dates and get a straight yes or no, and the day you would be clear again.
On your phone, nowhere else.
Trips stay on the device. Export and import them as a plain CSV whenever you like.