# MHD N55 E vs simos.app

The clearest difference is in-app purchases: MHD N55 E at none against simos.app's 3. MHD N55 E also leads on ratings volume (54 vs 2) and device support (3 vs 1). simos.app's advantage is rating (5.0 vs 4.6) and update cadence (every 6 days vs every 3 weeks). On price, ads and monetization model there is nothing between them.

Both are free to download. simos.app sells 3 one-off in-app purchases. MHD N55 E asks for nothing beyond the download.

simos.app holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: MHD N55 E has 54 ratings behind it against 2, so its average is the more settled of the two.

MHD N55 E ships an update every 3 weeks, simos.app every 6 days. The most recent releases landed on October 23, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | MHD N55 E | simos.app |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (54 ratings)](https://appshunter.io/ios/app/mhd-n55-e-series/id1502611398/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/simosapp/id6760018423/reviews)** |
| Number of ratings | **54** | 2 |
| Positive reviews | 79.2% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | Free | Free |
| Size | 123 MB | 6 MB |
| Requires iOS | **10.2** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [MHD Tuning UG (haftungsbeschraenkt)](https://appshunter.io/developer/1445162439) | [Tycho Sebastian Holzer](https://appshunter.io/developer/1882338941) |

## What reviewers say

### MHD N55 E

[App page](https://appshunter.io/ios/app/mhd-n55-e-series/id1502611398)

This utility app is being retired and users are encouraged to switch to a unified flasher app. It retains some functionality for reading and clearing engine error codes, analyzing past data logs, and accessing vehicle licenses and user guides.

**Highlights:** Read and clear engine DTC error codes, Graph and analyze prior datalogs, View existing vehicle licenses, Access user guide, Transition to unified flasher app

**Features:** macOS Compatibility

**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 (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| App VIN Unlock | $17.99 | one-time |
| Wizard: Pops & Bangs - Single Bin | $17.99 | one-time |
| Stage 1 Bin | $179.99 | one-time |


## Frequently asked questions

### Is MHD N55 E free?

MHD N55 E is free to download, with no in-app purchases.

### Is simos.app free?

simos.app is free to download, with in-app purchases available.

### Which has better reviews, MHD N55 E or simos.app?

simos.app is rated higher. MHD N55 E averages 4.6 out of 5 from 54 ratings, while simos.app averages 5.0 from 2 ratings.

### Do MHD N55 E or simos.app have ads?

Neither MHD N55 E nor simos.app shows ads.

### Which is updated more often, MHD N55 E or simos.app?

MHD N55 E ships an update every 3 weeks, and simos.app every 6 days. Most recently, MHD N55 E was updated on October 23, 2026 and simos.app on October 18, 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.*