simos.app
VAG ECU Diagnostics & Logging
About
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.
What's New in simos.app
1.9.10
September 9, 2026
- Added DQ381 CAL only flashing - DQ381 CAL flashing checks the box code and version against the TCU - Added Simos 18.x auto flash: writes only the blocks that changed - Flash tab now picks ECU or TCU, with the gearbox detected automatically - Cloud bins are filtered to the selected control unit - Display Eth % PID in Fuel - Fixed ECU + TCU HSL logging
MoreFAQ
What VAG ECUs does simos.app support?
simos.app is built for VAG petrol engines running Simos 18.1, 18.2, 18.4, 18.41, 18.6, 18.10, and Simos 12.1 ECUs. Full features are available for Simos 18.1/18.10 and 18.6, with flashing capabilities for Simos 18.2, 18.4, 18.41, and Simos 12.1.
What kind of data can I log with simos.app?
You can monitor and log various ECU parameters in real time, including boost pressure, injection timing, lambda, temperatures, and torque. The app allows for high sample rates over a Bluetooth LE connection.
Can simos.app be used to update my car's ECU?
Yes, simos.app allows you to update your ECU and TCU to the latest version for your vehicle or flash a custom tune. This feature is available for specific Simos ECU versions.
What hardware is required to use simos.app?
A Bluetooth LE OBD adapter is required to use simos.app. Compatible adapters include the one sold on simos.app/dongle, or the Macchina A0 and DIY A0 clone with custom firmware.
Is simos.app suitable for beginners?
The app is built for enthusiasts, tuners, and workshops. Basic knowledge of ECU diagnostics is recommended for optimal use of its advanced features.
How often is simos.app updated?
The latest version, 1.9.3, was released on 2026-07-16. Updates are frequent, ensuring the tool remains compatible with the latest ECU software and features.
What is the user sentiment for simos.app?
Based on the available data, simos.app has a high user rating of 5.0 stars from 2 ratings, indicating strong positive sentiment among its users.
Does simos.app have ads?
No, simos.app does not contain advertisements. It is a free application focused on providing diagnostic and tuning tools without interruptions.