How to Set a Repeat Alarm Every 3 Days on iPhone

Short answer: you can't do it with iPhone's built-in Clock app. Apple only lets you repeat on specific weekdays — not on custom day intervals. Here's what you can do instead.

Why this gap exists

Apple designed the alarm app around daily wake-up schedules. Every 3 days, every 2 weeks, every month — these patterns don't fit the weekday model, so they were never built in. The same is true of Android's built-in clock.

This leaves a large number of people — anyone managing medications, plant watering, pool maintenance, flea treatments, or dozens of other recurring tasks — without a native solution.

The workaround: use Ripple

How to set an alarm every 3 days in Ripple

From this point, the alarm fires every 3 days at the exact time you set — and after you dismiss it, it automatically schedules the next one 3 days later. No manual resetting required.

Other intervals Ripple supports

Ripple supports any interval from 1 hour up to 12 months. Common uses include every 2 days (vitamin reminders), every 7 days (weekly injections), every 2 weeks (fortnightly tasks), every 3 months (quarterly maintenance), and every 6 months (bi-annual checkups).

Is Ripple free?

Yes — the free tier includes up to 3 alarms and up to 5 rings per alarm, which covers most people's needs. Ripple Pro unlocks unlimited alarms, unlimited rings per alarm, the template gallery, Auto theme, and premium alarm sounds — from $34.99 lifetime (one-time), or $2.99/month or $19.99/year with a 14-day free trial on subscriptions.