# SIUI PIE vs KP Digital

The clearest difference is update cadence: KP Digital at every 5 months against SIUI PIE's every 13 months. SIUI PIE's advantage is iOS requirement (9.0 vs 13). 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.

SIUI PIE ships an update every 13 months, KP Digital every 5 months. The most recent releases landed on October 15, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | SIUI PIE | KP Digital |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 5 months** |
| Size | 3 MB | 32 MB |
| Requires iOS | **9.0** | 13 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Shantou Institute of Ultrasonic Inst. Co., Ltd.](https://appshunter.io/developer/406261738) | [桂林凯文彼德科技有限公司](https://appshunter.io/developer/1704162807) |

## What reviewers say

### SIUI PIE

[App page](https://appshunter.io/ios/app/siui-pie-3/id434341652)

**Features:** macOS Compatibility

**In-app purchases:** none


### KP Digital

[App page](https://appshunter.io/ios/app/kp-digital/id6743141959)

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

**In-app purchases:** none


## Frequently asked questions

### Is SIUI PIE free?

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

### Is KP Digital free?

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

### Do SIUI PIE or KP Digital have ads?

Neither SIUI PIE nor KP Digital shows ads.

### Which is updated more often, SIUI PIE or KP Digital?

SIUI PIE ships an update every 13 months, and KP Digital every 5 months. Most recently, SIUI PIE was updated on October 15, 2026 and KP Digital 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.*