Can reminders go out on their own?

Yes, on Pro and up, through an automation: 1. Click Requests, then the Automations tab. 2. Open an automation (or tap New automation). 3. In step 4, "If they haven't recorded", set Follow up every (1, 2, 3, 5 or 7 days) and How many follow-ups (None, 1, 2 or 3). 4. Tap Save (or Save and turn on).

The new automation starts at 2 follow-ups, 3 days apart.