# Kör Instructor vs Billappen

The clearest difference is in-app purchases: Kör Instructor at none against Billappen's 4. Billappen's advantage is update cadence (every 3 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Billappen sells 4 in-app purchases, starting at $5.99 per 7 days. Kör Instructor asks for nothing beyond the download.

Kör Instructor ships an update every 3 weeks, Billappen every 3 days. The most recent releases landed on October 1, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Kör Instructor | Billappen |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Size | 51 MB | 83 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kör Teknologi AS](https://appshunter.io/developer/1516104179) | [Teklos AS](https://appshunter.io/developer/1817229109) |

## What reviewers say

### Kör Instructor

[App page](https://appshunter.io/ios/app/kor-instructor/id1518128724)

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

**In-app purchases:** none


### Billappen

[App page](https://appshunter.io/ios/app/billappen/id6746510077)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ukesabonnement (partner) | $5.99 | per 7 days |
| Månedsabonnement (partner) | $17.99 | per month |
| Årsabonnement (partner) | $29.99 | per year |
| Årsabonnement | $119.99 | per year |


## Frequently asked questions

### Is Kör Instructor free?

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

### Is Billappen free?

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

### Do Kör Instructor or Billappen have ads?

Neither Kör Instructor nor Billappen shows ads.

### Which is updated more often, Kör Instructor or Billappen?

Kör Instructor ships an update every 3 weeks, and Billappen every 3 days. Most recently, Kör Instructor was updated on October 1, 2026 and Billappen on September 9, 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.*