# CalmPrime vs Stand Power

The clearest difference is in-app purchases: CalmPrime at none against Stand Power's 1. CalmPrime also leads on update cadence (daily vs every 3 weeks). Stand Power's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Stand Power sells 1 one-off in-app purchase. CalmPrime asks for nothing beyond the download.

CalmPrime ships an update daily, Stand Power every 3 weeks. The most recent releases landed on October 25, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | CalmPrime | Stand Power |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.7 (3 ratings)](https://appshunter.io/ios/app/stand-power/id6748025648/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 88.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Daily** | Every 3 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 31 MB | 156 MB |
| Requires iOS | 16 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPod, Apple Watch** |
| Age rating | 9+ | 4+ |
| Developer | [HUNG-PIN YU](https://appshunter.io/developer/963095666) | [凯祥 孟](https://appshunter.io/developer/1877739028) |

## What reviewers say

### CalmPrime

[App page](https://appshunter.io/ios/app/calmprime/id6744655217)

**Features:** macOS Compatibility

**In-app purchases:** none


### Stand Power

[App page](https://appshunter.io/ios/app/stand-power/id6748025648)

Engage with the JOJO universe through an anime quiz, customize your phone with JOJO-style ringtones, and trigger unique sound effects on your Apple Watch. This app is perfect for fans of JOJO, anime, and manga.

**Highlights:** JOJO Anime Quiz, JOJO-style Ringtones, Apple Watch Sound Effects, Explore JOJO Characters, Discover Story Backgrounds

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Unlock | $1.99 | one-time |


## Frequently asked questions

### Is CalmPrime free?

CalmPrime is free to download, with no in-app purchases.

### Is Stand Power free?

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

### Do CalmPrime or Stand Power have ads?

CalmPrime shows ads; Stand Power does not.

### Which is updated more often, CalmPrime or Stand Power?

CalmPrime ships an update daily, and Stand Power every 3 weeks. Most recently, CalmPrime was updated on October 25, 2026 and Stand Power on October 21, 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.*