CentralPlanner is also available as an app for Android and iOS. This means you are not restricted to using CentralPlanner in the browser on your smartphone or tablet.
Android
You can find the CentralPlanner app for Android in the Google Play Store:
https://play.google.com/store/apps/details?id=net.centralplanner
iOS
You can find the CentralPlanner app for iOS in the Apple App Store:
https://apps.apple.com/us/app/centralplanner/id1507786846