# K9 Eventcenter vs Studio 21

The clearest difference is iOS requirement: Studio 21 at 12.0 against K9 Eventcenter's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 25, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | K9 Eventcenter | Studio 21 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Size | 55 MB | 116 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [Felix Fischer](https://appshunter.io/developer/1777083889) | [Reach Rocker GmbH](https://appshunter.io/developer/6776540230) |

## What reviewers say

### K9 Eventcenter

[App page](https://appshunter.io/ios/app/k9-eventcenter/id6737563753)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### Studio 21

[App page](https://appshunter.io/ios/app/studio-21/id6741527580)

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

**In-app purchases:** none


## Frequently asked questions

### Is K9 Eventcenter free?

K9 Eventcenter is free to download, with no in-app purchases.

### Is Studio 21 free?

Studio 21 is free to download, with no in-app purchases.

### Do K9 Eventcenter or Studio 21 have ads?

Neither K9 Eventcenter nor Studio 21 shows ads.

### Which is updated more often, K9 Eventcenter or Studio 21?

K9 Eventcenter ships an update monthly, and Studio 21 monthly. Most recently, K9 Eventcenter was updated on October 25, 2026 and Studio 21 on October 7, 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.*