Set a focus for the week.
Want to land your knee slice more often? Make it your weekly focus, set a target, and track the passes you land in live rounds. At the end of the week, review how it went and decide what to work on next.
For the self‑motivated grappler.
Pick one skill to work on, talk through your rounds after class, and see what’s working in your game over time.
Try Sub System for freeNow available on iPhone
Talk through your rounds.
Say what happened while it’s fresh and Sub System turns it into a session log you can review before saving. You can also log sessions manually.
See who it works against.
Your favourite pass might feel solid against someone your size but fail against a bigger, more experienced partner. Rate each technique by the size and skill level of the people you can land it on.
Map your game.
Track over 90 skills across guards, passes, sweeps, takedowns, submissions and more. See which parts of your game you can rely on and where you could use more rounds.
Frequently asked
What does Sub System do?
Sub System is a training and progress tracker for jiu-jitsu. You pick one skill to work on each week, log your rounds after class, and see what’s working in your game over time.
Who is it for?
It’s built for no-gi grapplers who want to train with a plan. You set your belt when you start, from white to black, and choose your own focus each week.
Do I have to log sessions by voice?
No. You can talk through your rounds and review the log before saving, or add everything by hand. AI-assisted logging is optional and you can turn it off in Settings.
How does the free trial work?
The yearly plan starts with one month free, then renews each year unless you cancel at least 24 hours before renewal. There’s a monthly plan too. Apple shows the price before you confirm, and you can cancel any time in your Apple Account’s subscriptions.
Where is my training data kept?
Your skills, ratings and sessions are stored on your iPhone and sync through your own private iCloud when it’s available. Voice notes and typed notes are only sent for processing if you choose AI-assisted logging. The privacy policy has the details.
Is there an Android version?
Not at the moment. Sub System is available on iPhone only.
Need more help? Get in touch
