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Tap the plus button to make a counter. Choose when it starts and ends, then choose what counts inside that period: every day, weekdays, weekend days, public holidays, business days, or something more particular behind Advanced. The grid below draws one cell for every day the rule picked.
Touch and hold an empty part of the home screen, tap Edit, then Add Widget, and search for Opportunities Left. Add it in either size. To change which counter a widget shows, touch and hold the widget itself and tap Edit Widget.
Widgets redraw when the day changes and whenever you edit a counter. If one looks stale, open the app once and it will catch up.
Business days and public holidays need to know your country's holidays, which the app looks up the first time you use those rules. It needs a network connection once for each year the counter covers. Open the counter while online and the number appears.
Past about 1,200 cells the picture stops being readable and the app shows the number alone. Edit the counter and set "Count in" to Weeks: ten years becomes 520 cells instead of 3,650, and the grid comes back.
On your device, in the space the app shares with its widget. There is no account and nothing is uploaded. Deleting the app deletes them, so they do not come back on a reinstall.
What the app collects, and the little it sends, is described in the privacy policy.