Google Calendar & Outlook · iPhone

How to Make Calendar Reminders Persistent

Standard calendar reminders are designed to disappear. A persistent reminder stays on your screen — loud and visible — until you acknowledge it. Here's what that distinction means and how to actually set it up.

Download on the App Store

Works with Google Calendar & Microsoft 365 / Outlook

Direct Answer

Google Calendar and Outlook don't support persistent reminders natively. Their alerts are push notifications that vanish automatically. To get persistent calendar reminders on iPhone, use OnTimer — it connects to your Google or Outlook calendar and fires an alarm for each event that stays on screen until you dismiss it.

What “Persistent” Actually Means

A standard calendar reminder fires once and disappears. It appears in your notification tray for a few seconds, and then it's gone — whether you saw it or not. Whether you acted on it or not. Whether you were even looking at your phone or not.

A persistent reminder works differently. It stays on your screen. It keeps alerting. It does not go away until you actively dismiss it.

This is the same behavior as your morning alarm clock. You don't wake up because you happened to notice a notification. You wake up because something won't stop until you turn it off.

Standard Reminder

Persistent Reminder

Disappears automatically

Stays until dismissed

No response required

Requires active acknowledgment

Fades into notification tray

Stays on your lock screen or in-app

Easy to miss in deep work

Interrupts regardless of what you're doing

One alert, then silence

Continues until you respond

Why Default Calendar Reminders Fail

Google Calendar and Microsoft Outlook both use the same notification system as every other app on your phone. Your calendar reminder is competing with Messages, email, Slack, social media, and whatever else fires that day.

In that environment, a single banner notification that appears for a few seconds doesn't stand out. Especially when you're focused. Especially when you're in the middle of something. Especially when you've seen dozens of notifications already and your brain has learned to filter them out.

You don't need more reminders. You need one that won't let you ignore it.

How OnTimer Provides Persistent Reminders

OnTimer is an iPhone app that connects to your Google Calendar and Microsoft 365 / Outlook calendar. It reads your schedule and fires a persistent alarm before each event.

Stays on screen until dismissed

Unlike a notification, the alarm occupies your full screen and requires an explicit dismiss action before it goes away.

Fires for every calendar event automatically

You don't configure reminders per meeting. OnTimer monitors your connected calendars and fires alarms automatically.

Works with Google Calendar and Outlook

Connect one or both. OnTimer handles both Google and Microsoft accounts, including multiple accounts per provider.

Adjustable lead time

Set how far in advance you want the alarm — 5 minutes, 15 minutes, 30 minutes. Works for your workflow.

Download on the App Store

Free · iPhone · Google Calendar & Microsoft 365 / Outlook

Especially Important for ADHD and Time Blindness

For people with ADHD or time blindness, a passive notification has almost no chance of breaking through hyperfocus. You see it — or you don't — and either way it disappears, and the meeting starts without you.

A persistent alarm is categorically different. It doesn't ask for your attention. It takes it. That's the signal strength needed to interrupt a focused state.

ADHD time blindness tools →

Frequently Asked Questions

How do I make Google Calendar reminders persistent?▾

Google Calendar doesn't natively support persistent reminders — its alerts are push notifications that disappear automatically. To get persistent reminders for Google Calendar events on iPhone, use OnTimer: it connects to your Google Calendar and fires a persistent alarm for every event that stays on your screen until dismissed.

How do I make Outlook calendar reminders persistent on iPhone?▾

Outlook's native iPhone reminders are standard push notifications. OnTimer connects to your Microsoft 365 or Outlook calendar and replaces those with persistent alarms that don't disappear until you actively dismiss them.

What is a persistent calendar reminder?▾

A persistent calendar reminder stays on your screen and continues alerting you until you respond — unlike a standard notification, which disappears automatically after a few seconds regardless of whether you saw it or acted on it.

Why do calendar reminders keep getting ignored?▾

Because they're notifications, not alarms. Notifications are designed to inform without interrupting. If you're focused on something else, notifications fade into the background. A persistent reminder demands acknowledgment — it doesn't stop until you tell it to.

Can I get loud, persistent calendar alerts on iPhone?▾

Yes. OnTimer turns your Google Calendar and Outlook events into loud, persistent alarms on iPhone. They use your system alarm sound, stay on screen until dismissed, and can override silent mode for critical events.