# APR PCU vs simos.app

The clearest difference is update cadence: simos.app at every 4 days against APR PCU's every 5 months. APR PCU's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.6). On price, 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.

APR PCU ships an update every 5 months, simos.app every 4 days. The most recent releases landed on September 23, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | APR PCU | simos.app |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/simosapp/id6760018423/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 4 days** |
| Monetization | — | Free |
| Size | 141 MB | 6 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Holley Performance Products](https://appshunter.io/developer/1175069390) | [Tycho Sebastian Holzer](https://appshunter.io/developer/1882338941) |

## What reviewers say

### APR PCU

[App page](https://appshunter.io/ios/app/apr-pcu/id6462687757)

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

**In-app purchases:** none


### simos.app

[App page](https://appshunter.io/ios/app/simosapp/id6760018423)

This tool provides diagnostic, data logging, and flashing capabilities for VAG petrol engines with specific Simos ECUs. Monitor real-time engine parameters, analyze recorded sessions with graphs, and update your ECU with stock or custom tunes.

**Highlights:** Real-time ECU parameter monitoring, Live data logging via Bluetooth LE, ECU identification (software/calibration IDs), Multi-channel graph analysis of logged sessions, ECU and TCU flashing (stock and custom tunes), Support for Simos 18.x and 12.1 ECUs

**In-app purchases:** none


## Frequently asked questions

### Is APR PCU free?

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

### Is simos.app free?

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

### Do APR PCU or simos.app have ads?

Neither APR PCU nor simos.app shows ads.

### Which is updated more often, APR PCU or simos.app?

APR PCU ships an update every 5 months, and simos.app every 4 days. Most recently, APR PCU was updated on September 23, 2026 and simos.app on October 1, 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.*