Android 8.0+ · Free · No account
Most alarm apps can do "every day" or "every Monday". Periodic Alarm handles the awkward ones — every 2nd day, every 3rd, every 14th — and then rings a full-screen alarm you can't quietly swipe away.
No ads. No trackers. No sign-up.
The app holds no internet permission at all. Nothing can leave your phone.
No email, no login, no cloud sync. Open it and set an alarm.
Wakes the device even in Doze, and reschedules itself after a reboot.
One focused tool. No ads, no upsells, no subscription.
Use cases
If you've ever tried to make a normal alarm app remember "every other day", you already know why this exists.
Alternate-day dosing, steroids that taper, tablets you take every third day — set the gap once and the reminder keeps its own rhythm. Your dose name goes straight in the reminder message, so the alarm tells you what to take, not just that it's time.
Weekly or fortnightly injections, B12 shots, fertility schedules and allergy courses.
Fortnightly and monthly replacements — the reminder nobody remembers unaided.
Every 3rd day for the thirsty ones, every 10th for the succulents.
Flea and worm treatments, medication, tank cleaning, litter changes.
Rest-day-aware routines: every 2nd day exercises, stretches, recovery sessions.
Fortnightly recycling, filter changes, bed linen, descaling the kettle.
Hair wash days, retinol nights, supplements taken on a cycle.
Please note: Periodic Alarm is a reminder tool, not a medical device. It doesn't give medical advice or track doses. Always follow the schedule your doctor or pharmacist gave you.
The idea
Instead of picking weekdays, you tell Periodic Alarm how many days to skip between rings. The interval is simply the gap plus one.
Pick a start date, pick a time, and the whole series follows from there — no calendar entries to maintain and nothing to re-arm each week.
Alarm rings Skipped
How it works
The series begins whenever you say — today, or the day your next course starts.
Use a preset — Daily, 1-day, 2-day, 4-day, Weekly, Bi-weekly — or type any number.
"Take 5 mg tablet with food." That text is what the alarm shows when it rings.
Features
An alarm is only useful if it actually gets your attention — and only tolerable if you can dismiss it in one gesture.
Takes over the lock screen, turns the display on and shows your reminder in large type. Dismiss with a single swipe up.
A quiet notification five minutes ahead, so a dose can be timed with food or you can get to the fridge before the alarm sounds.
Tap Skip on that heads-up and only the next ring is dropped. The rest of the series carries on untouched.
Your system alarm tone at alarm volume, with vibration — routed through the alarm channel so it isn't muffled by media settings.
Every enabled alarm is re-registered automatically after the phone reboots. Nothing silently disappears.
Scheduled as a true system alarm clock, so it fires on time even after hours of the phone sitting idle.
Pause a course without losing its schedule, then flip it back on when you resume.
Built with Material 3 and Jetpack Compose, with dynamic colour on Android 12+.
Privacy
Health-adjacent reminders are sensitive data. The simplest way to protect them is to never collect them — so Periodic Alarm doesn't.
INTERNET permission in the app, so no data can be uploadedFAQ
Stock clock apps repeat on chosen weekdays, so anything that isn't a 7-day cycle drifts out of alignment. "Every 2nd day" lands on different weekdays each week — Periodic Alarm counts days, not weekdays, so it stays correct indefinitely.
Yes. Each alarm has its own start date, time, gap and reminder message, and its own on/off switch.
Tap Skip today on the 5-minute heads-up notification and only that occurrence is dropped; the schedule continues as planned. You can also toggle an alarm off temporarily.
Yes. Alarms use Android's alarm channel and appear over the lock screen. Note that if you've silenced the alarm volume itself, Periodic Alarm will raise it so you're not left with a silent alarm.
Always — the app has no networking code and no internet permission. Flight mode makes no difference to it.
Android 8.0 (Oreo) and newer. On Android 12 and above you may be asked to allow "Alarms & reminders", and on Android 14 and above to allow full-screen notifications — both are needed for an alarm to ring on time.
Yes. No ads, no in-app purchases, no subscription and no paid tier.
Free, offline and ad-free. Around a megabyte, and it does exactly one thing well.
Requires Android 8.0 or later.