Reminders not arriving?

Heartside schedules reminders on your phone, so they work without internet. If they stop: check that notifications are allowed for Heartside in your phone’s settings. On Android, also allow “Alarms & reminders”. Some phones (Samsung, Xiaomi, Huawei, OnePlus) put apps to sleep to save battery. Find Heartside under Battery and set it to “Unrestricted” or “Don’t optimise”. After that, reminders will arrive on time.