Keep the residency you chose — and track every other country's 183-day rule, plus the ties that count, so you never slip into a second one.
From photos you already have. No GPS.
Coming soon to the App Store. iPhone · iOS 18+.
Open the app and the first thing you see is your ledger: each jurisdiction you watch, the days you've banked this tax year, and a colour you can read at a glance. Green is clear. Amber is close. Red means you've triggered residency — and Review means something other than days needs your attention.
Built around one question: “Am I about to become tax-resident anywhere I didn't mean to?”
Every other day counter follows you with background location. Flags doesn't. It reads the timestamp and the optional region tag your phone already attaches to a photo — using offline maps, on your device — and turns it into a day in a country. The ledger updates itself.
Missing photos for a stay? The app spots the gap and suggests where you were — you confirm, or add it by hand. Manual and automatic days live side by side, with a dot on any day that's still missing.
Residency hangs on more than a day count. Tell Flags where you keep a home, where your family lives, and where you work — and for most countries, any one of those can make you resident regardless of days. The app raises a quiet Review flag so you can check it with an advisor.
The UK's Statutory Residence Test uses those same ties to lower your day limit — two ties drops you from 183 to 120. And if you're a US citizen, Flags reminds you what your passport already means: you're taxable wherever you are.
Spend too long somewhere you don't track and most apps stay silent. Flags doesn't: when your days in a country start to matter it suggests adding it, and once you're near the line it starts watching automatically — so an accidental residency can't sneak up on you.
And it remembers. Step back through this year and the last five — each shows where you stood at year-end, every country that mattered (even ones you weren't tracking then), and the exact dates of every stay.
Residency, tax, the days you spent in another country — this is the sensitive kind of data. So we built the app that can't see it. No account, no sync, no analytics SDK, no advert network, no proxy that could glimpse your days in passing. Everything runs on your iPhone, offline.
The whole story is on the privacy page. The short version: nothing.
It counts the days you spend in every country and US state and compares them against each one's tax-residency threshold — usually the 183-day rule. The home screen is a ledger: each jurisdiction you watch, the days you've banked this tax year, and a clear verdict — safe, close, or over. It's built to answer one question: am I about to accidentally become tax-resident somewhere?
It reads the date and the coarse place-stamp your camera already wrote into each photo, and turns that into a country using offline maps — entirely on your device. There is no location permission and no background tracking. That's the difference from every GPS-based day counter: nothing follows you around. No photos for a stay? Add it by hand: country, dates, done.
All ~239 countries plus the 50 US states and DC. Each jurisdiction carries its own tax-year start date — the UK's 6 April, India's 1 April, Australia's 1 July, and so on, with the calendar year as the default. Major destinations (UK, US, Portugal, UAE, Spain, Switzerland, Singapore and more) have plain-English rule text; everywhere else uses the standard 183-day presence test.
It includes a simplified UK SRT ties editor and per-jurisdiction tax years, so the day counts line up with the right window. It is a design-level model, not a full tax engine — the UK ties grid is simplified, and things like the US substantial-presence 3-year weighting and FEIE are not modelled.
Yes. You can flag where your home, family, or work is — for most countries any of those can trigger residency regardless of how many days you spend there, so Flags shows a 'Review' warning. The UK's ties also lower your day limit, and US citizens are flagged because citizenship-based taxation follows you anywhere.
Yes — the current year plus the last five. Each shows your final status for every jurisdiction that mattered (including ones you weren't tracking then) and the exact dates of each stay.
No. Flags is an early-warning tool to stop you tipping over a threshold by accident — not legal or tax advice. Residency rules have exceptions the app deliberately keeps simple. Always confirm your position with a qualified tax professional before you act on it.
Completely. Everything runs on your iPhone, offline. There is no account, no cloud sync, and not one line of analytics. Your days, jurisdictions, and verdicts never leave the device. Delete the app and it's gone.
It's almost ready and coming soon to the App Store — iPhone, iOS 18 and up. Pricing will be announced at launch.
For people who count their days — and the ties that count against them. Coming soon to the App Store.
More apps in the fleetAlready live: Schengen Calculator · Countries Visited Map. See the fleet →