Free trial, grace period and read-only mode

1. Free trial, 14 days: everything unlocked (Pro limits).
2. Grace period, 7 more days: everything still works; a red banner reminds you to choose a plan.
3. Read-only: you can still sign in, view and export everything, but you cannot add or change anything, and no automatic reminders are sent. Choosing a plan unlocks everything instantly.

Your data is never deleted because a trial ended.