simos.app
VAG ECU Diagnostics & Logging
Only for iPhone
Free · In‑App Purchases
iPhone
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.
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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.
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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
Ratings & Reviews
- Fixed logging in flash unlock
- Fixed ECU response timeout
- Allow ECU detection of Simos 19.x
- Added Simos 19.x logging
The developer, Tycho Sebastian Holzer, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Holzer Consulting
- Size
- 5 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- App VIN Unlock $17.99
- Wizard: Pops & Bangs - Single Bin $17.99
- Stage 1 Bin $299.99
- Copyright
- © 2026 Holzer Consulting Tycho Holzer