Comparison

Between Dates Calendar Math vs Calculator83

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

Head to head
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.

About

Calculator83

A minimalist calculator app focused on simplicity and a clean workflow. It offers both basic and scientific modes, allowing users to perform calculations without complex settings. Get started quickly with this straightforward tool.

Highlights
  • Minimalist design
  • Clean workflow
  • Basic mode
  • Scientific mode
  • Easy to use
Features
Read full description

Calculator83 is a minimalist calculator designed with simplicity to the core and an emphasis on a clean workflow. Be up and running in seconds! Featuring two modes of operation, basic and scientific. The goal of this app is to allow users to have a powerful calculator without the fuss of learning all the settings of a powerful calculator.

Screenshots

Between Dates Calendar Math4 screens
Calculator833 screens

Verdict

The call

The clearest difference is price: Calculator83 at Free against Between Dates Calendar Math's $0.99. Calculator83 also leads on rating (5.0 vs 4.8) and review sentiment (63% vs 50%). Between Dates Calendar Math's advantage is update cadence (every 4 months vs every 20 months) and ratings volume (42 vs 4). On ads, in-app purchases and device support 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

Calculator83 is free to download; Between Dates Calendar Math costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Calculator83 holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Between Dates Calendar Math has 42 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 50% of Between Dates Calendar Math's written reviews are positive against 63% of Calculator83's.

UpkeepUpdate frequency

Between Dates Calendar Math ships an update every 4 months, Calculator83 every 20 months. The most recent releases landed on October 23, 2026 and October 29, 2026 respectively.

Scorecard7 real differences · 3 level
Between Dates Calendar Math versus Calculator83: the parameters behind the verdict, then further details
ParameterBetween Dates Calendar MathCalculator83
Price$0.99Free — better
Rating4.8 (42 ratings)5.0 (4 ratings) — better
Positive reviews50.0% of reviews62.5% of reviews — better
Number of ratings42 — better4
Update frequencyEvery 4 months — betterEvery 20 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size1 MB10 MB
Age rating4+4+
DeveloperDucky Planet LLCLyker Labs LLC

Customer experience

Between Dates Calendar Math

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

Calculator83

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews8 reviews
Positive62.5%
Neutral12.5%
Negative25.0%

In-app purchases

None

Between Dates Calendar Math

No in-app purchases

None

Calculator83

No in-app purchases

Questions

Is Between Dates Calendar Math free?
Between Dates Calendar Math costs $0.99, with no in-app purchases.
Is Calculator83 free?
Calculator83 is free to download, with no in-app purchases.
Which has better reviews, Between Dates Calendar Math or Calculator83?
Calculator83 is rated higher. Between Dates Calendar Math averages 4.8 out of 5 from 42 ratings, while Calculator83 averages 5.0 from 4 ratings.
Do Between Dates Calendar Math or Calculator83 have ads?
Neither Between Dates Calendar Math nor Calculator83 shows ads.
Which is updated more often, Between Dates Calendar Math or Calculator83?
Between Dates Calendar Math ships an update every 4 months, and Calculator83 every 20 months. Most recently, Between Dates Calendar Math was updated on October 23, 2026 and Calculator83 on October 29, 2026.

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