Sub Buddy

This app brings the most realistic and accurate digital German U-boat Attack Disc to life and, for the first time, to hand-held devices so you can use it just like a real slide-rule!

Whether you are a lone Silent Hunter, or you play as part of a Wolfpack, these realistic and powerful tools will allow you to become one of the best Aces of the Deep!

We've designed a unique circular slide rule called the 'TADS Computer' and together they will allow any player of WW2 Submarine games to perform calculations and complex torpedo solutions faster than a calculator or a spreadsheet.

To help you, we've created 27 unique Training Videos, one for each specific task or operation, so you can easily and quickly learn the immense power these discs provide. You will need an internet connection to stream these videos.

Another unique feature is our 'Visual AoB Helper' - or 'Angle on Bow' helper - that you can use to visually replicate what you see in game and get an accurate AoB reading to within a single degree! We also allow you to change the time of day and weather so you can best match the conditions in-game!

We sincerely hope you love these discs as much as we do and believe us, once you become skilled in their use, you will be able to do almost any calculation with them - ‘submarine sim’ or even real life - so quickly you'll amaze your friends and fellow players.


Requires Android 9.0 (Pie) and above.


Using the discs:
- Use 1-finger touch to rotate the discs
- Use 2-fingers to zoom and pan.
- Use the cog to change the Attack Disc language and other settings


We also treasure our privacy, as well as all yours, and no data is captured or stored other than the app's own settings. Network calls are only made to YouTube when watching the training videos.

We cannot guarantee Sub Buddy will run on all devices due to the vast range of Android devices. Please ensure you try out each feature within the first 48 hours of purchase and request a refund in that time if anything is not functional.

Known Issue:

On some devices (Android 11 and prior) if you use the Android Back button to exit, the Attack Disc, TADS and Angle on Bow estimator reset to the default positions when you return to the app.

To prevent the Android Back button from exiting the app, within Sub Buddy Android go to Library, and then Support, and enable the "Prevent Android back button exiting app" setting.

Recent changes:
- FIXED: Error when trying to watch a video in the library
- By default the low memory disc versions are used, to be compatible with more devices. You can update your preferences via the disc settings.
- Updates to how settings are stored. This will mean default disc settings are used until you update your preferences.
- Updates to the Credits and a new Support section in Library
- Updates to work on newer versions of the Android operating system means app no longer supports Android 8 and prior