A dated journal with a calendar — mark your days, add as many entries as you like — and a gentle practice timer. Everything saves on this device and rides along in your Codex backup.
Practice timer
Set a length and sit. A soft chime sounds at the end; log the session to today with one tap.
10:00
The chime is scheduled on the audio hardware, so it still sounds at the end if the screen locks or you switch apps mid-sit. iOS can't fire it once the app is fully closed (swiped away) — for a guaranteed alarm then, also set the iPad Clock timer.
Calendar
Tap a day to open it. Days with entries show a dot; marked days show their colour.