Everything you need to know about stacking your time off.
100% mathematically accurate. We fetch up-to-date public holiday data from the Nager.Date global API. The engine precisely overlays these public bank holidays onto standard weekends to mathematically guarantee the longest possible unbroken streaks of time off.
Absolutely not. HolidayStacks runs entirely locally in your browser. We never connect to your Google Calendar or Outlook, we don't ask for an account, and we never see or store your personal data. Your schedule hacking stays private.
We currently support over 100 countries based on the availability of reliable open-source holiday data. If your country is missing or regional data is incomplete, it's usually an upstream API limitation. Send us a message on the Contact page!
They change how the algorithm prioritizes its DP calculations. 'One massive holiday' aggressively seeks out the single longest continuous chain of days. 'Frequent 4-day weekends' avoids long chains to instead maximize the total number of short, high-ROI trips across the year. 'Balanced breaks' attempts a healthy mix of both.
Yes! HolidayStacks automatically fetches the latest data for the upcoming year, so you can start planning your PTO as early as you want.