Stay the right side of 183 days, in every country that is counting.
Tax residency tests, statutory residence rules, and citizenship absence limits run on different calendars at the same time. AtlasDays tracks them side by side, against the same record.
One country counts a calendar year. Another counts a fiscal year starting in April. A third counts any rolling 365 days, and the United States wants a weighted sum across three of them. These windows overlap, they disagree, and they are all running whether or not you are watching.
The year you notice is usually the year you have already crossed one. By then the question is not what you owe, it is what you can show.
Presets for the tests people actually face
Residence presets carry each country's own window and threshold, so a Portuguese 183-day count and a UK tax year behave differently because they are different, not because you configured them differently.
Choose whether your goal is to stay below the line or to reach it. Both are real reasons to count, and the app tracks either direction.
Every threshold on one screen
Residence tests, visa limits, and personal goals stack on the dashboard, each running on its own calendar. You can see which one binds first instead of checking them one at a time and hoping you remembered all of them.
Something you can hand to an accountant
Export the trips, the days, and the countries as a PDF or a spreadsheet. The person filing on your behalf gets dates they can check, not a number you are asking them to believe.