# StudyPerks vs Earth Rotation

The clearest difference is price: StudyPerks at Free against Earth Rotation's $0.99. StudyPerks also leads on update cadence (every 6 weeks vs every 22 months) and iOS requirement (9.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

StudyPerks is free to download; Earth Rotation costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

StudyPerks ships an update every 6 weeks, Earth Rotation every 22 months. The most recent releases landed on December 5, 2025 and September 21, 2026 respectively.

## The numbers

| Metric | StudyPerks | Earth Rotation |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/earth-rotation/id1610455878/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 22 months |
| Monetization | — | Paid |
| Size | 81 MB | 46 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Avosis, LLC](https://appshunter.io/developer/1473102522) | [Masahiro Tomosada](https://appshunter.io/developer/1587710118) |

## What reviewers say

### StudyPerks

[App page](https://appshunter.io/ios/app/studyperks/id1594569539)

**Features:** macOS Compatibility

**In-app purchases:** none


### Earth Rotation

[App page](https://appshunter.io/ios/app/earth-rotation/id1610455878)

Explore a 3D simulation of celestial bodies. Adjust rotation speeds, reverse direction, and alter lighting angles. Choose from three distinct Earth visual styles for an interactive learning experience.

**Highlights:** Adjustable rotation speed, Reverse rotation direction, Adjustable sun lighting angle, Three Earth visual styles, 3D celestial animation

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

**In-app purchases:** none


## Frequently asked questions

### Is StudyPerks free?

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

### Is Earth Rotation free?

Earth Rotation costs $0.99, with no in-app purchases.

### Do StudyPerks or Earth Rotation have ads?

Neither StudyPerks nor Earth Rotation shows ads.

### Which is updated more often, StudyPerks or Earth Rotation?

StudyPerks ships an update every 6 weeks, and Earth Rotation every 22 months. Most recently, StudyPerks was updated on December 5, 2025 and Earth Rotation on September 21, 2026.

---

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