Comparison

Shift Calendar vs Between Dates Calendar Math

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

Head to head
About

Shift Calendar

A customizable shift calendar designed for firefighters, paramedics, and EMS workers. Easily track work and off days for important personal events, supporting various common shift patterns. Includes note-taking for each shift day.

Highlights
  • Customizable shift schedules
  • Supports 24/24, 24/48, 24/72 patterns
  • Supports 48x96 pattern
  • Alpha and Numeric shift naming
  • Notes for each shift day
  • Designed for firefighters and EMS
Features
Currently charting
Read full description

Thank you for your interest in Shift Calendar, the app designed by Firefighters and built for Firefighters. Shift Calendar is the full functioning, eternal shift calendar specifically for the professional firefighter, paramedic, EMS worker, their family and friends. No more checking shift cards to see if you will be working or off on your anniversary, birthday or other important events. This version of the Shift Calendar is configurable to present shift schedules specifically for the following: 24/24 for departments working 2 platoons 24 on 24 off. 24/48 for departments working 3 platoons 24 on 48 off. 24/72 for departments working 4 platoons 24 on 72 off. For departments working more complex schedules such as 24 on and 24 off for 5 days with 96 off as A-C-A-B-A-B-C-B-C-REPEAT, look for our ShiftCal Kelley schedule app. Newly released is the popular 48x96 for departments working 3 platoons 48 on 96 off as A-A-B-B-C-C-REPEAT. Search on Cal30 to see these other options. Shift Calendar provides for both Alpha and Numeric shift naming conventions. As of version 2.0, users can now keep notes on each shift day. Future enhancements will target Kelly Day/ADO. Spread the word and pass it around. Most of all...Thank you for all you do...

About

Between Dates Calendar Math

Calculate the number of days between two dates with a simple interface. Save, recall, sort, and remove date calculations. Add or subtract days from selected dates for quick date projections.

Highlights
  • Calculate days between dates
  • Save and recall date calculations
  • Sort and remove saved dates
  • Add or subtract days
  • Copy dates to start/end
  • Reset dates to current
Features
Read full description

Between Days was written to quickly tell how many days are between two dates. It uses a simple interface to get these answers in the quickest way possible. Underneath the simplicity, Between Days is one of the most feature rich date apps in the app store. Don’t let the simple interface fool you, this app does show a lot of information in a clean and easy to use format. To use the app simply set the start date and end date and it will display the number of days between those two dates. To select which date to edit you can either touch the date you want to change, or press the setting start date/ setting end date button. The selector will automatically change to display the date selected. It will also display the current day of the week showing on the calendar selector. If you would like to save the date for later, simply press the save button on the bottom. To recall a date, or to view saved dates press the view dates button on the bottom. Once you are at the list of dates you can sort or remove them. You can also press on a date to use it as the current date, or press done to return to your previous dates. There are also add and subtract buttons. This is useful if you need to find what the date is before or after a certain number of days, month or years. The copy to end date/copy to start date button will set both the start date and end date to the selected date. The reset button will set the beginning and end date to the current date, but will leave your saved dates alone. I hope you enjoy this app and find it useful! If you have any questions or comments send me an e-mail at Don.Espe@gmail.com Please rate this app so I know if there is enough interest to develop new features for it.

Screenshots

Shift Calendar4 screens
Between Dates Calendar Math4 screens

Verdict

The call

The clearest difference is rating: Between Dates Calendar Math at 4.8 against Shift Calendar's 2.3. Between Dates Calendar Math also leads on review sentiment (50% vs 28%) and device support (4 vs 2). Shift Calendar's advantage is update cadence (fortnightly vs every 4 months) and chart position (#151 vs unranked). On ratings volume, ads and in-app purchases 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

Shift Calendar costs $1.99 and Between Dates Calendar Math $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Between Dates Calendar Math holds the better App Store score, 4.8 against 2.3. Both are backed by a comparable volume of ratings — 83 and 42 respectively. Written reviews point the same way: 28% of Shift Calendar's written reviews are positive against 50% of Between Dates Calendar Math's.

UpkeepUpdate frequency

Shift Calendar ships an update fortnightly, Between Dates Calendar Math every 4 months. The most recent releases landed on November 6, 2026 and November 1, 2026 respectively.

Scorecard8 real differences · 3 level
Shift Calendar versus Between Dates Calendar Math: the parameters behind the verdict, then further details
ParameterShift CalendarBetween Dates Calendar Math
Price$1.99$0.99 — better
Rating2.3 (83 ratings)4.8 (42 ratings) — better
Positive reviews27.9% of reviews50.0% of reviews — better
Number of ratings83 — better42
Update frequencyFortnightly — betterEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
Best chart rank#151 — better—
DevicesiPhone, iPodiPhone, iPad, iPod, Mac — better
Requires iOS8.4 — better13.0
Further details — not scored
Size1 MB1 MB
Age rating4+4+
DeveloperGil EstesDucky Planet LLC

Customer experience

Shift Calendar

All ratings71 ratings
Positive28.2%
Neutral12.7%
Negative59.2%
Written reviews68 reviews
Positive27.9%
Neutral13.2%
Negative58.8%

Between Dates Calendar Math

All ratings42 ratings
Positive95.2%
Neutral0.0%
Negative4.8%
Written reviews8 reviews
Positive50.0%
Neutral25.0%
Negative25.0%

Bugs and requests

Shift Calendar

Reported bugs

26 issues
  • Download did not complete
  • App keeps crashing
  • App does not open
  • App is inoperable after Apple update
  • App crashes when opening date and adding notes
Show 21 more
  • App disappears after iOS update
  • App not compatible with latest iOS
  • App crashes when trying to open
  • App crashes when trying to open it closes back
  • Update 14.2 made app crash
  • App will not open since last IOS update
  • App ceased working upon 14.2 iOS update
  • App will not open, crashes immediately
  • App needs to be updated to new IOS
  • App will not even open with new iPhone update
  • App needs an update
  • App crashes every time you enter a note
  • App closes every time you try to enter information
  • App closes as soon as you try to type anything in the notes
  • Crashes when I add notes
  • App shuts down when you hit the space bar
  • App will shut down when you hit the space bar
  • App crashes and does not save information
  • App crashes when entering notes for specific days
  • App crashes when hitting the return key
  • App crashes when adding notes

Requested features

14 requests
  • Accommodate 48/96 schedules
  • Support for 4 on 4 off shifts
  • Support for 5 days on, 4 days off schedules
  • Support for split shifts (2x10hrs off 24 then 2x14hrs then off for 4 days)
  • Add more shift variations
Show 9 more
  • Update Kelly Style app
  • Add built-in alarm for shift days
  • Allow multiple calendars
  • More shift color options
  • Faster month/year scrolling
  • Auto-generated payday
  • Add more custom markers (T, M, etc.)
  • Option to change pattern like Kelly shift calendar
  • Notify of scheduled events

Between Dates Calendar Math

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Shift Calendar

No in-app purchases

None

Between Dates Calendar Math

No in-app purchases

Questions

Is Shift Calendar free?
Shift Calendar costs $1.99, with no in-app purchases.
Is Between Dates Calendar Math free?
Between Dates Calendar Math costs $0.99, with no in-app purchases.
Which has better reviews, Shift Calendar or Between Dates Calendar Math?
Between Dates Calendar Math is rated higher. Shift Calendar averages 2.3 out of 5 from 83 ratings, while Between Dates Calendar Math averages 4.8 from 42 ratings.
Do Shift Calendar or Between Dates Calendar Math have ads?
Neither Shift Calendar nor Between Dates Calendar Math shows ads.
Which is updated more often, Shift Calendar or Between Dates Calendar Math?
Shift Calendar ships an update fortnightly, and Between Dates Calendar Math every 4 months. Most recently, Shift Calendar was updated on November 6, 2026 and Between Dates Calendar Math on November 1, 2026.

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