HolidayStack
Stack your days off for the longest possible breaks.
HolidayStack combines your annual leave with public and bank holidays to find the longest runs of consecutive days off. Smart PTO optimizer, year-end stacking, carry-over modelling and calendar export — across 15 countries with regional detail. Offline and private.
How it works
Set up your leave year
Pick your country or region, enter your annual leave balance and any carried-over days, and choose whether your leave year follows the calendar or your employer's fiscal year.
See your best breaks
HolidayStack instantly surfaces your "next big break" and ranked alternatives — each showing total days off, PTO spent, and an efficiency score — including the year-end Christmas stack.
Save, export & share
Save plans, track them from draft to booked, get countdown reminders, and export any break as a calendar file to open yourself or share with your partner.
in Action
Your next big break, found for you.
A full year calendar with holidays and booked breaks marked.
Save and track every plan from draft to booked.
Plan detail with one-tap calendar (.ics) export and share.
Your leave year, your way — region, balance and custom days.
One-time Pro unlock — no subscription.
Features
Smart PTO optimizer
Finds the most efficient breaks for your leave budget, ranked by days off per PTO day spent — so a few days off become a long break.
Year-end stacking
Automatically spans the year boundary to surface the Christmas-to-New-Year stack, usually the most efficient break of the year.
Carry-over modelling
Set carried-over days with an expiry date and the optimizer budgets them correctly before they lapse.
Full year calendar
Public and bank holidays plus your booked breaks, shaded and clear, scrolling across the whole year.
Calendar (.ics) export
Export any plan to Google or Apple Calendar, or share it with your partner so it opens straight into their calendar app.
15 countries, 60 regions
UK (England & Wales, Scotland, NI separately), US federal + states, Germany's 16 states, Canada, Australia, and nine more.
Custom days off
Add company shutdowns, birthdays or anniversaries so the optimizer counts them as days off too.
Countdown reminders
Gentle nudges to book in time and a heads-up before you depart, so a planned break actually happens.
Pick exact dates
Prefer to choose your own window? Pick a date range and HolidayStack does the PTO and weekend maths for you.
Offline & private
Holidays and your plans live on your device. No account to create.
One-time price
A single $3.99 unlock — no subscription. The free tier lets you view holidays and keep one plan first.
Phone & tablet
A clean Material 3 interface that adapts from phone to tablet.
Pricing
View holidays, keep one saved plan, and export one calendar file a month for free. Unlock everything with a single payment — no subscription, ever.
HolidayStack Pro
- Unlimited saved vacation plans
- Unlimited calendar (.ics) exports
- Switch between any country or region
- Carry-over PTO modelling
- Half-day planning
- No ads · no subscription