# Prime Period vs ShiftRest

Prime Period and ShiftRest are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Prime Period sells 2 in-app purchases, starting at $0.99 per month and ShiftRest sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Prime Period | ShiftRest |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Size | 1 MB | 50 MB |
| Requires iOS | 16.6 | **16.4** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Figenblad](https://appshunter.io/developer/1886139159) | [kazuki Okamoto](https://appshunter.io/developer/1893666651) |

## What reviewers say

### Prime Period

[App page](https://appshunter.io/ios/app/prime-period-cycle-tracker/id6760766761)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium - Monthly | $0.99 | per month |
| Premium - Yearly | $9.99 | per year |


### ShiftRest

[App page](https://appshunter.io/ios/app/shiftrest-night-shift-sleep/id6787724243)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ShiftRest Pro (Monthly) | $1.99 | per month |
| ShiftRest Pro (Yearly) | $11.99 | per year |
| ShiftRest Pro (Lifetime) | $24.99 | one-time |


## Frequently asked questions

### Is Prime Period free?

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

### Is ShiftRest free?

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

### Do Prime Period or ShiftRest have ads?

Neither Prime Period nor ShiftRest 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.*