The best way to contact support for Rebel Timer is through the in-app Bug / Feedback screen.
Inside the app, go to:
More → Bug / Feedback
This lets you send:
a description of the issue
reproduction steps
optional screenshots or image attachments
app diagnostics that help us investigate problems
If you cannot access the app, contact:
support@rebelfightco.com
To help us troubleshoot faster, include:
your device type
app version
what you were doing when the issue happened
any screenshots that help explain the problem