# Between Dates Calendar Math vs Datum

The clearest difference is review sentiment: Datum at 100% against Between Dates Calendar Math's 50%. Between Dates Calendar Math's advantage is price ($0.99 vs $1.99) and iOS requirement (13.0 vs 17.6). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

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

Between Dates Calendar Math ships an update every 4 months, Datum every 3 months. The most recent releases landed on October 6, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Between Dates Calendar Math | Datum |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| Rating | **[4.8 (42 ratings)](https://appshunter.io/ios/app/between-dates-calendar-math/id442169104/reviews)** | — |
| Number of ratings | **42** | — |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Paid | Paid |
| Size | 1 MB | 11 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | iPhone, iPad, iPod, Mac | **iPhone, iPad, Mac, Apple Watch, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Ducky Planet LLC](https://appshunter.io/developer/442169107) | [Michael Lindinger](https://appshunter.io/developer/1431086653) |

## What reviewers say

### Between Dates Calendar Math

[App page](https://appshunter.io/ios/app/between-dates-calendar-math/id442169104)

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:** Vision Pro support

**In-app purchases:** none


### Datum

[App page](https://appshunter.io/ios/app/datum-calendar/id1552646317)

A minimalist calendar application designed for Apple devices, offering a clean interface and customizable widgets for iOS, macOS, and watchOS. View upcoming events, daily schedules, and monthly overviews directly from your home screen or watch face.

**Highlights:** Minimalist calendar interface, Lockscreen widgets for iOS, Event display widgets, Calendar widgets with event marks, watchOS calendar and complications, Support for iPhone, iPad, Mac, and Apple Watch

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Between Dates Calendar Math free?

Between Dates Calendar Math costs $0.99, with no in-app purchases.

### Is Datum free?

Datum costs $1.99, with no in-app purchases.

### Do Between Dates Calendar Math or Datum have ads?

Neither Between Dates Calendar Math nor Datum shows ads.

### Which is updated more often, Between Dates Calendar Math or Datum?

Between Dates Calendar Math ships an update every 4 months, and Datum every 3 months. Most recently, Between Dates Calendar Math was updated on October 6, 2026 and Datum on October 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*