Ive used a lot of reminder apps... Almost none of them let you schedule a reminder for every 3 days or every 2 weeks. Proud does!! It also has many options for setting up how your reminders work, whether theyre locked to a certain time or can be pushed off for later, what time do you want "afternoon" and "evening" to mean. I like customization :)
They responded *super* quickly & helpfully to a feedback email, I would recommend sending them a note if you encounter any trouble at all.
Lalitrev about Proud, v1.3