Underhook — Brazilian Jiu-Jitsu brain training.
Questions, bug reports, feedback, or account requests — email us and we'll get back to you:
We usually reply within 1–2 business days.
To request access to, or deletion of, the data tied to your account, email the address above from the account you use in the app. See our Privacy Policy for what we store and why.
Underhook Pro is billed through your Apple ID. Manage or cancel any time in Settings → your name → Subscriptions on your iPhone.