Comparison

CalendarDuo vs ShiftPay Calendar

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

CalendarDuo

Easily manage and view holidays from two different countries simultaneously. This utility app offers instant switching between calendars, a dual-view display, and helpful tools like a world clock and currency exchange.

Highlights
  • Switch between two world calendars instantly
  • Duo-view with holidays from two countries
  • Daylight Saving Time dates
  • Currency exchange rate
  • World clock
  • Add notes
Features
Read full description

** This app does not access your Contact List or Calendar. ** CalendarDuo allows users to switch between two calendars at their fingertips! CalendarDuo is the best tool for: - Frequent flyer between two countries/regions - Organizing events with family members or relatives overseas - Scheduling meetings and tasks with colleagues overseas - Planning trips to another country/region - ANYONE who needs a simple calendar! Top features - Switching between TWO world calendars INSTANTLY - Duo-view displaying ONE calendar with holidays of TWO countries/regions - User interface with multiple language selection - Daylight Saving Time (DST) dates - Currency exchange rate (for currencies available in Europe Central Bank) - World clock - Adding notes CalendarDuo is the simplest calendar you’ll ever need! NEW! 2026 holidays are available now! - public holidays - bank holidays - statutory holidays - regional holidays - provincial holidays - special days NEW! 2022 World Calendars (more are coming!): - Australia - Canada - China (PRC) - France - Germany - Hong Kong - India (Maharashtra, New Delhi) - Indonesia - Italy - Japan - Macau - Malaysia - Philippines - Portugal - Singapore - South Korea - Taiwan - Thailand - United Kingdom - United States - Vatican City Holiday information is gathered from government official releases. Source details can be found on each Holiday List.

About

ShiftPay Calendar

Features
Read full description

ShiftPay Calendar is a shift planner and pay estimate tool for nurses, carers, security staff, warehouse workers, hotel teams, retail staff, and anyone working rotating rosters. Track day shifts, evening shifts, night shifts, days off, and repeating roster patterns in a simple calendar. Add your hourly rate and common penalty rates to estimate what your month may be worth before payday. Privacy Policy: https://xuezhanying.github.io/shiftpay-calendar-legal/privacy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Key features: - Manual shift entry for real rosters assigned by your manager. - Calendar view for day, evening, night, and off days. - Roster templates for common rotating schedules. - Pay estimates with hourly rate, night rate, weekend rate, and public holiday rate support. - Pro upgrade for unlimited templates and advanced pay rules. - Restore purchases through the App Store. ShiftPay Calendar is for personal planning and pay estimation. It does not replace your employer's payroll system or official employment advice. Privacy Policy: https://xuezhanying.github.io/shiftpay-calendar-legal/privacy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

CalendarDuo4 screens
ShiftPay Calendar3 screens

Verdict

The call

The clearest difference is in-app purchases: CalendarDuo at none against ShiftPay Calendar's 3. ShiftPay Calendar's advantage is ads (none vs shown) and update cadence (every 5 days vs every 4 months). On price, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. ShiftPay Calendar sells 3 in-app purchases, starting at $1.99 per month. CalendarDuo asks for nothing beyond the download.

UpkeepUpdate frequency

CalendarDuo ships an update every 4 months, ShiftPay Calendar every 5 days. The most recent releases landed on October 15, 2026 and October 4, 2026 respectively.

Scorecard3 real differences · 5 level
CalendarDuo versus ShiftPay Calendar: the parameters behind the verdict, then further details
ParameterCalendarDuoShiftPay Calendar
PriceFreeFree
Positive reviews50.0% of reviews—
Update frequencyEvery 4 monthsEvery 5 days — better
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationAd-supported—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.115 — better
Further details — not scored
Size41 MB1 MB
Age rating4+4+
DeveloperChun Lam定云 张

In-app purchases

None

CalendarDuo

No in-app purchases

3 purchases

ShiftPay Calendar

Subscriptions2
  • ShiftPay Pro Monthly$1.991 Month
  • ShiftPay Pro Annual$14.991 Year
One-time1
  • ShiftPay Pro Lifetime$24.99

Questions

Is CalendarDuo free?
CalendarDuo is free to download, with no in-app purchases.
Is ShiftPay Calendar free?
ShiftPay Calendar is free to download, with in-app purchases available.
Do CalendarDuo or ShiftPay Calendar have ads?
CalendarDuo shows ads; ShiftPay Calendar does not.
Which is updated more often, CalendarDuo or ShiftPay Calendar?
CalendarDuo ships an update every 4 months, and ShiftPay Calendar every 5 days. Most recently, CalendarDuo was updated on October 15, 2026 and ShiftPay Calendar on October 4, 2026.

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