simos.app
VAG ECU Diagnostics & Logging
About
This tool provides diagnostic, data logging, and flashing capabilities for specific VAG petrol engine ECUs. It allows real-time monitoring of engine parameters, ECU identification, and analysis of recorded sessions through multi-channel graphs. Users can also update their ECU with stock or custom tunes.
What's New in simos.app
1.9.15
October 29, 2026
- CarPlay: new gauge tile view (iOS 26), up to 14 PIDs - Simos 10 (SA3) and Simos 8.x: CAL, full and auto flashing - Added flash support (ECM3 checksum) for SC8F83, SC2E56 and SG1H00 - DSG logging: fixed multi-frame requests to the TCU being sent too fast - DSG CAL/ASW hashes now sync to the server; files picked from the phone record their hashes - Fixed Boost, Calc HP, Calc TQ and Fuel Trim missing from HSL logs on many Simos 18 versions - Added HSL logging for SC8LB4, SC8S30 and SCG545 - Logging now stops before a flash starts; no more false Mode 22 error while flashing
MoreSubscriptions & In-App Purchases
$17.99
App VIN Unlock
Unlock the apps features for a single VIN
FAQ
What VAG ECUs does simos.app support?
simos.app is built for VAG petrol engines running Simos 18.1, 18.2, 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 read and log 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 I update my ECU with simos.app?
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 supported Simos ECU versions.
What hardware do I need 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, as well as Macchina A0 and DIY A0 clone adapters which may require 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. It is intended for informational and diagnostic purposes.
What devices does simos.app support?
Currently, simos.app is supported on iPhone devices. It is available for download on the App Store.
How often is simos.app updated?
The latest version, 1.9.15, was released on October 29, 2026, indicating active development. Users can expect regular updates to improve functionality and compatibility.
What is the user rating for simos.app?
simos.app has a high user rating of 5.0 stars based on 2 ratings. This suggests a very positive user experience among its current user base.
