# Keller ATA vs Hidden Jiu

The clearest difference is update cadence: Hidden Jiu at every 2 weeks against Keller ATA's every 2 months. Keller ATA's advantage is iOS requirement (10.0 vs 16.6). On price, ads, in-app purchases and device support there is nothing between them.

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

Keller ATA ships an update every 2 months, Hidden Jiu every 2 weeks. Both last shipped on October 25, 2026.

## The numbers

| Metric | Keller ATA | Hidden Jiu |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Size | 20 MB | 45 MB |
| Requires iOS | **10.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nicosia Family Taekwondo LLC](https://appshunter.io/developer/1502785757) | [Emily Sudduth](https://appshunter.io/developer/1721274803) |

## What reviewers say

### Keller ATA

[App page](https://appshunter.io/ios/app/keller-ata/id1502785758)

**Features:** macOS Compatibility

**In-app purchases:** none


### Hidden Jiu

[App page](https://appshunter.io/ios/app/hidden-jiu-jitsu/id6480127094)

**In-app purchases:** none


## Frequently asked questions

### Is Keller ATA free?

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

### Is Hidden Jiu free?

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

### Do Keller ATA or Hidden Jiu have ads?

Neither Keller ATA nor Hidden Jiu shows ads.

### Which is updated more often, Keller ATA or Hidden Jiu?

Keller ATA ships an update every 2 months, and Hidden Jiu every 2 weeks. Most recently, Keller ATA was updated on October 25, 2026 and Hidden Jiu on October 25, 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.*