# Between Dates Calendar Math vs SPHERA Alarm

The clearest difference is price: SPHERA Alarm at Free against Between Dates Calendar Math's $0.99. Between Dates Calendar Math's advantage is in-app purchases (none vs 10) and iOS requirement (13.0 vs 15.0). On ads and device support there is nothing between them.

SPHERA Alarm is free to download; Between Dates Calendar Math costs $0.99 up front. SPHERA Alarm sells 10 in-app purchases, starting at $1.99 per month. Between Dates Calendar Math asks for nothing beyond the download.

## The numbers

| Metric | Between Dates Calendar Math | SPHERA Alarm |
| --- | --- | --- |
| 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 | No |
| Update frequency | Every 4 months | — |
| Monetization | Paid | — |
| Size | 1 MB | 79 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ducky Planet LLC](https://appshunter.io/developer/442169107) | [Shin Onoshima](https://appshunter.io/developer/1803371608) |

## 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


### SPHERA Alarm

[App page](https://appshunter.io/ios/app/sphera-alarm/id6766024241)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SPHERA Plus Monthly | $1.99 | per month |
| SPHERA Plus Yearly | $14.99 | per year |
| Prism Wake | $0.99 | one-time |
| Synapse Tone | $0.99 | one-time |
| Zenith Pulse | $0.99 | one-time |
| Quiet Flux | $0.99 | one-time |
| Solar Thread | $0.99 | one-time |
| Velvet Radar | $0.99 | one-time |
| Soft Circuit | $0.99 | one-time |
| Stellar Mallet | $0.99 | one-time |


## Frequently asked questions

### Is Between Dates Calendar Math free?

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

### Is SPHERA Alarm free?

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

### Do Between Dates Calendar Math or SPHERA Alarm have ads?

Neither Between Dates Calendar Math nor SPHERA Alarm shows ads.

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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.*