# PSIS4 vs Welis Mobile

The clearest difference is update cadence: Welis Mobile at every 3 weeks against PSIS4's every 20 months. Welis Mobile also leads on device support. On price, in-app purchases and iOS requirement there is nothing between them.

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

PSIS4 ships an update every 20 months, Welis Mobile every 3 weeks. The most recent releases landed on September 22, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | PSIS4 | Welis Mobile |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | Every 20 months | **Every 3 weeks** |
| Size | 30 MB | 31 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [YONG SOKHENG](https://appshunter.io/developer/1702023342) | [NEXOFT](https://appshunter.io/developer/1761777155) |

## What reviewers say

### PSIS4

[App page](https://appshunter.io/ios/app/psis4/id6460007747)

**In-app purchases:** none


### Welis Mobile

[App page](https://appshunter.io/ios/app/welis-mobile/id6800780854)

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

**In-app purchases:** none


## Frequently asked questions

### Is PSIS4 free?

PSIS4 is free to download, with no in-app purchases.

### Is Welis Mobile free?

Welis Mobile is free to download, with no in-app purchases.

### Which is updated more often, PSIS4 or Welis Mobile?

PSIS4 ships an update every 20 months, and Welis Mobile every 3 weeks. Most recently, PSIS4 was updated on September 22, 2026 and Welis Mobile on October 13, 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.*