Calendar Event Reminder (CER)

1.01K reviews
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About this app

THE App for calendar reminders - never forget an appointment anymore! Perfect for business user!
Calendar Event Reminder (CER) adds a repeating calendar reminder and extends the stock calendar application. You can customize the duration, repetitions, sound and vibration pattern. Works with every synced calendar.

After adjusting CER's settings to your liking, add a calendar reminder to your existing calendar to see how it works! When alarm / reminder goes off the device will be turned on and a popup window with information about the event (title, time, location) is displayed. Alarm / reminder can be disabled by tapping Dismiss or snoozed by the Snooze button.

Watch a demo on YouTube: !!!

** Settings per calendar
** Repeating reminder / alarm alert for all synced calendars (even corporate calendar)
** Customizable vibration pattern / alarm sound
** Lock screen style sliders or wheel to snooze / discard alarm
** Froyo / Gingerbread / ICS look & feel for sliders
** Text-to-Speech
** Stays open after every/last/no reminder
** Multiple snooze buttons with adjustable snooze logic and layout
** Wakes up device display automatically
** Shows notifications in the notification bar
** Supports LED flashing
** Supports to flash screen during alarm
** Customizable orientation
** Clean and simple

** Supports Android 2.1+ up to most recent version.

** ...and more!

In combination with the Android calendar this app can be used as a personal assistance to automatically notify you about upcoming birthdays / anniversaries, when to take your medicine or other things of life you don't want to forget.


- You must disable your alarm sound within the stock calendar app; otherwise CERs alarms may be suppressed
- Exclude CER from all task killer apps

- Touchdown and Lotus Traveler not supported!

Comments, feature requests and questions are welcomed.
Vote for new features on the website. You can follow me on twitter @invalidobject_ for latest info.

Willing to help translate this app into your favorite language? Email or go to:

Explanation of the permissions:
- android.permission.VIBRATE
Control vibrator: Used for the alarm to vibrate the phone with the desired vibration pattern
- android.permission.WAKE_LOCK
Disable standby modus: Used to make sure that the screen isn’t turned off during alarm
- android.permission.READ_PHONE_STATE
Phone calls / read phone state: This is to not interrupt active calls by the alarm and to stop the alarm when a phone call comes in.
- android.permission.READ_CALENDAR
Read calendar events: This is to get the time, title and location from the event when an alarm is raised.
- android.permission.WRITE_CALENDAR
Modify calendar events: When an alarm is snoozed my app has to store a new reminder for the event. This is stored in the calendar database.
- android.permission.GET_TASKS
Retrieve running applications: Used by the home helper to get the Launchers which can be associated with the home key
Set preferred apps: Used by the home helper to replace the launcher for the home key
- android.permission.HARDWARE_TEST
Test hardware: Used to set the screen brightness for flashing screen
- android.permission.RECEIVE_BOOT_COMPLETED
Automatically start at boot: Checks for unfinished / missed reminders when phone is started
- android.permission.MODIFY_AUDIO_SETTINGS
Change audio settings: Used to set a custom volume for the alarm
License check: Used to check if the user is using a valid license
- android.permission.WRITE_EXTERNAL_STORAGE
SDCard access: Used to read/write settings file for im/export
- android.permission.WRITE_SETTINGS
Change system settings: Used to overwrite the display timeout
Updated on
Dec 3, 2017

Data safety

Developers can show information here about how their app collects and uses your data. Learn more about data safety
No information available

Ratings and reviews

985 reviews
YouTube Watching
November 17, 2022
I wouldn't change a thing, you simply cannot live without this app. I'm shocked that all the functionality this app provides is not native to all cell phones. This is a godsend. The only enhancement I would like to see in future versions would be more buttons to customize regarding snoozing intervals. I would like to see 8 to 10 verses the six currently available
4 people found this review helpful
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A Google user
November 21, 2018
STILL WORKING! and 5 stars again. Using galaxy s9+ with latest oreo. Be sure notification is on. Go into the phone's settings, select notifications, scroll down to CER and make sure the notification is on. It's WORKING! I Have set up tests for the last 2 days that worked. The November security update for Oreo prompted me to start over. I did a reinstall and changed a couple settings to my liking. That's it. I had made some earlier changes to the stock calendar which were cosmetic but there may have been others I don't remember. So I can't pinpoint what fixed it. I will go to 5 stars again if it keeps working.
2 people found this review helpful
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A Google user
July 1, 2019
NO LONGER IN DEVELOPMENT for 2 years! I really wish I hadn't missed that! Google has to keep mucking with reminders causing havoc for third parties. Yet their calendar app doesn't offer BASIC snooze functionality from Palm OS from 2002! Just viewing event cancels the alert, HOW AWFUL! I'm trying to replace Calendar Snooze which just went out of development as well. This app is okay, but I never want a popup over screen. You can't sent the vibration pattern separately from the alert time. It has a constant notification that CER is running which is awful. A 2 hour refund limit on top of that is NOT enough time to test an application like this! Google needs to stop allowing sales of applications that are no longer in development without a clear warning AND better return policy. So much for not being evil.
21 people found this review helpful
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What's new

- Fixed: Alarms not firing reliably on devices with Android KitKat or later