# Between Dates Calendar Math vs ImpARial

The clearest difference is price: ImpARial at Free against Between Dates Calendar Math's $0.99. ImpARial also leads on update cadence (fortnightly vs every 4 months). Between Dates Calendar Math's advantage is in-app purchases (none vs 2) and ads (none vs shown).

ImpARial is free to download; Between Dates Calendar Math costs $0.99 up front. ImpARial sells 2 in-app purchases, starting at $0.99 per month. Between Dates Calendar Math asks for nothing beyond the download.

Between Dates Calendar Math ships an update every 4 months, ImpARial fortnightly. The most recent releases landed on November 1, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Between Dates Calendar Math | ImpARial |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| 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 | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Paid | — |
| Size | 1 MB | 10 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ducky Planet LLC](https://appshunter.io/developer/442169107) | [Michal Indra](https://appshunter.io/developer/1256483572) |

## 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


### ImpARial

[App page](https://appshunter.io/ios/app/imparial-ar-unit-converter/id1569188195)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $0.99 | per month |
| Yearly subscription | $4.99 | per year |


## Frequently asked questions

### Is Between Dates Calendar Math free?

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

### Is ImpARial free?

ImpARial is free to download, with in-app purchases available.

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

ImpARial shows ads; Between Dates Calendar Math does not.

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

Between Dates Calendar Math ships an update every 4 months, and ImpARial fortnightly. Most recently, Between Dates Calendar Math was updated on November 1, 2026 and ImpARial on October 27, 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.*