ZeroCrewFlags
For people who move a lot.
Once you live in more than one country, a few counters start running in the background: your Schengen days, your tax-residency days, and the list of places you've been. Flags is three apps that keep each count in plain sight.
The apps
Flags Schengen
Stay inside the Schengen 90/180 rule. See the days you've used, the days you have left, and the day you need to leave.
iPhone, iOS 18 or later
Flags Tax
Count your days in each country so tax residency never surprises you, and learn how the rules work. Education only, not tax advice.
iPhone, iOS 18 or later
Flags Map
Your countries-visited map, filled in from the dates and places your photos already store.
iPhone and iPad, iOS and iPadOS 26.1 or later
Flags Tax and Flags Schengen explain the rules and count your days. They don't give tax, legal, or immigration advice.
Flags on YouTube
Animated explainers on Schengen days, tax residency, and the countries you've been to. New videos every week.
Watch on YouTube- Schengen days
How the 90/180 rule counts your days, and how to plan around it.
- Tax residency
How day counts and each country's thresholds decide where you're tax resident.
- Countries you've been to
The countries you've visited, counted and mapped.