Every rule that governs how long you can stay somewhere comes down to counting days. These tools do that arithmetic for you — free, in the browser, no sign-up.
What it does. Shows entry requirements for 199 passports against every destination: visa-free days allowed, eTA, e-visa, visa on arrival, or visa required.
Who it's for. Anyone planning a trip who wants to know what their passport gets them — before they book.
Check visa requirements for your passport →What it does. A browsable index of all 199 per-passport pages — every destination your passport can enter, grouped by requirement type.
Who it's for. Frequent travelers comparing what different passports unlock, or researching a second citizenship.
Explore visa-free access by passport →What it does. Enter your trips and get days used inside the rolling 180-day window, your latest safe departure date, and overstay warnings.
Who it's for. Visa-free visitors to the Schengen area — digital nomads, long-stay tourists, split-time couples.
Calculate your Schengen days →What it does. Counts your days in any country against the bright-line 183-day residency threshold shared by the UK, Canada, India, and many US states.
Who it's for. People approaching a residency threshold in one place and needing a hard number, not a guess.
Count your days against the 183-day rule →What it does. Applies the IRS formula — 31 days this year plus 183 weighted days across three years — to your US travel history.
Who it's for. Non-US citizens with frequent US trips: consultants, snowbirds, founders, visiting family.
Run the IRS substantial presence test →What it does. Day-count rules for all 50 US states, DC, and the Canadian provinces — 64 guides with thresholds, statutory tests, and official links.
Who it's for. Anyone splitting the year between states or provinces and needing the local rule, not a generality.
Look up your state or province day-count rule →Rules change and every situation is different — each tool links the official sources behind its numbers. For definitions of the terms used here, see the glossary; for exactly how days get counted, see the counting methodology.
Day31 for iPhone builds your day counts automatically from where you actually were, watches every limit you care about, and warns you before you cross one. Offline and private — your data never leaves your device.
