# campusM vs Sub Buddy

The clearest difference is price: campusM at Free against Sub Buddy's $5.99. campusM also leads on update cadence (monthly vs every 12 months). Sub Buddy's advantage is iOS requirement (12.0 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

campusM is free to download; Sub Buddy costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

campusM ships an update monthly, Sub Buddy every 12 months. The most recent releases landed on September 13, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | campusM | Sub Buddy |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| Rating | — | **[5.0 (10 ratings)](https://appshunter.io/ios/app/sub-buddy/id1470196349/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 12 months |
| Monetization | — | Paid |
| Size | 71 MB | 1.2 GB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Ex Libris LTD](https://appshunter.io/developer/1095433456) | [Zoe Summers](https://appshunter.io/developer/1468119556) |

## What reviewers say

### campusM

[App page](https://appshunter.io/ios/app/campusm/id416335099)

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

**In-app purchases:** none


### Sub Buddy

[App page](https://appshunter.io/ios/app/sub-buddy/id1470196349)

This app provides a realistic digital replica of a German U-boat Attack Disc, functioning as a circular slide rule for complex torpedo calculations in WW2 submarine games. It includes 27 training videos and a visual Angle on Bow helper, with customizable controls for left and right-handed users.

**Highlights:** Realistic U-boat Attack Disc simulation, Circular slide rule for torpedo solutions, 27 bundled training videos, Visual Angle on Bow helper, Adjustable time of day and weather, Left and right-handed modes, Customizable menu system

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

**In-app purchases:** none


## Frequently asked questions

### Is campusM free?

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

### Is Sub Buddy free?

Sub Buddy costs $5.99, with no in-app purchases.

### Do campusM or Sub Buddy have ads?

Neither campusM nor Sub Buddy shows ads.

### Which is updated more often, campusM or Sub Buddy?

campusM ships an update monthly, and Sub Buddy every 12 months. Most recently, campusM was updated on September 13, 2026 and Sub Buddy on September 26, 2026.

---

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