# Selfdefensebox Academy vs Ski

The clearest difference is iOS requirement: Selfdefensebox Academy at 15.6 against Ski's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Selfdefensebox Academy sells 4 one-off in-app purchases and Ski sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Selfdefensebox Academy ships an update every 3 weeks, Ski every 2 weeks. The most recent releases landed on October 30, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Selfdefensebox Academy | Ski |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (4 ratings)](https://appshunter.io/ios/app/ski-ergometer-workout/id6740768215/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | — | Freemium |
| Size | 50 MB | 41 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 17+ | 4+ |
| Developer | [Selfdefensebox CGN GmbH](https://appshunter.io/developer/1533651403) | [Christoph Gogolin](https://appshunter.io/developer/511901280) |

## What reviewers say

### Selfdefensebox Academy

[App page](https://appshunter.io/ios/app/selfdefensebox-academy/id6738961557)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| E-Book: 30 Tipps zur Selbstve | Free | one-time |
| 20 WEGE FETT ZU VERBRENNEN | Free | one-time |
| Krav Maga Basic Online Kurs | $34.99 | one-time |
| Selfdefensebox Acad Membership | $89.00 | one-time |


### Ski

[App page](https://appshunter.io/ios/app/ski-ergometer-workout/id6740768215)

Enhance your indoor skiing performance with this comprehensive workout companion. Track every movement, set personal challenges, and gain detailed insights into your training. Seamlessly integrates with Apple Watch and iPhone for real-time stats and convenient control.

**Highlights:** Precise workout tracking, Personal best challenges, iPhone and Apple Watch integration, Convenient workout control, GameCenter leaderboards, Export to Strava & Concept2, Bluetooth SkiErg monitor connection

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Pro features (monthly) | $1.99 | per month |
| All Pro features (yearly) | $19.99 | per year |


## Frequently asked questions

### Is Selfdefensebox Academy free?

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

### Is Ski free?

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

### Do Selfdefensebox Academy or Ski have ads?

Neither Selfdefensebox Academy nor Ski shows ads.

### Which is updated more often, Selfdefensebox Academy or Ski?

Selfdefensebox Academy ships an update every 3 weeks, and Ski every 2 weeks. Most recently, Selfdefensebox Academy was updated on October 30, 2026 and Ski on November 4, 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.*