Write to us at nolandurkin@gmail.com. A real person from the family reads every message, usually within a day or two.
On your device. If iCloud is on, Apple syncs them between your own devices in your own account. We never see them and have no server that could.
Check the silent switch on the side of your phone, and the Sound toggle in the app’s Settings. Trinsmo always yields to the silent switch on purpose.
No, and it never will. There are no streaks, scores, or reminders in Trinsmo. The notebook just waits for you.