MHD N55 E vs simos.app
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MHD N55 E
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.
- Read and clear engine DTC error codes
- Graph and analyze prior datalogs
- View existing vehicle licenses
- Access user guide
- Transition to unified flasher app
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This app is being retired. Please switch to our unified "MHD Flasher" app which now supports all E/F/G series vehicles / engines as well as Supra. This app will remain as a shell to help you switch over. Additionally, some functionality will remain to read and clear engine DTC error codes, graph and analyze your prior datalogs, view your existing vehicle licenses, and access the user guide!
simos.app
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.
- 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
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simos.app is a diagnostic, data logging and flashing tool built specifically for VAG petrol engines running Simos 18.1, 18.2, 18.6, 18.10 and Simos 12.1 ECUs. The platforms found in most modern TSI and TFSI engines across Audi, VW, Škoda, SEAT, Cupra and Porsche. LIVE DATA LOGGING Read ECU parameters directly in real time. Monitor boost pressure, injection timing, lambda, temperatures, torque and more at high sample rates over a Bluetooth LE connection. ECU IDENTIFICATION Read software versions, calibration IDs and hardware info straight from the control unit. LOG ANALYSIS Visualize recorded sessions with multi-channel graphs. Spot correlations between parameters without leaving the app. FLASHING Update your ECU and TCU to the latest version for your vehicle or flash a custom tune. Full features available for Simos 18.1/18.10 and 18.6. Flashing stock files or pre-unlocked ecus for Simos 18.2, 18.4, 18.41 and Simos 12.1. –– Built for enthusiasts, tuners and workshops who need more than a generic scan tool. Basic knowledge of ECU diagnostics is recommended. This app is for informational and diagnostic purposes only. Any modifications to vehicle systems are the sole responsibility of the user and must comply with local laws and regulations. –– Bluetooth LE OBD adapter required. Get yours here: https://simos.app/dongle Other compatible adapters: Macchina A0, DIY A0 clone https://github.com/Switchleg1/AMAleg require custom firmware: https://simos.app/dongle/firmware
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | MHD N55 E | simos.app |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (54 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 79.2% of reviews | — |
| Number of ratings | 54 — better | 2 |
| Update frequency | Every 3 weeks | Every 6 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 10.2 — better | 17.6 |
| Further details — not scored | ||
| Size | 123 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | MHD Tuning UG (haftungsbeschraenkt) | Tycho Sebastian Holzer |
Customer experience
MHD N55 E
simos.app
In-app purchases
MHD N55 E
No in-app purchases
simos.app
- App VIN Unlock$17.99
- Wizard: Pops & Bangs - Single Bin$17.99
- Stage 1 Bin$179.99
