# C.J.S Public School vs Study Clock

The clearest difference is in-app purchases: C.J.S Public School at none against Study Clock's 1. C.J.S Public School also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.0). Study Clock's advantage is update cadence (every 4 weeks vs every 41 months). On price and device support there is nothing between them.

Both are free to download. Study Clock sells 1 one-off in-app purchase. C.J.S Public School asks for nothing beyond the download.

C.J.S Public School ships an update every 41 months, Study Clock every 4 weeks. The most recent releases landed on October 10, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | C.J.S Public School | Study Clock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 41 months | **Every 4 weeks** |
| Size | 32 MB | 28 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lalit Kumar](https://appshunter.io/developer/1474571243) | [SnowdropSoft](https://appshunter.io/developer/1541796403) |

## What reviewers say

### C.J.S Public School

[App page](https://appshunter.io/ios/app/cjs-public-school/id1350853531)

**Features:** macOS Compatibility

**In-app purchases:** none


### Study Clock

[App page](https://appshunter.io/ios/app/study-clock-deep-focus-timer/id6756950093)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is C.J.S Public School free?

C.J.S Public School is free to download, with no in-app purchases.

### Is Study Clock free?

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

### Do C.J.S Public School or Study Clock have ads?

Study Clock shows ads; C.J.S Public School does not.

### Which is updated more often, C.J.S Public School or Study Clock?

C.J.S Public School ships an update every 41 months, and Study Clock every 4 weeks. Most recently, C.J.S Public School was updated on October 10, 2026 and Study Clock on October 14, 2026.

---

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