There are some limitations in the free version of the App. The differences between the free and pro version are detailed here:
The free version has a simple banner ad at the bottom of the app. We do not use any full screen or popup ads. All ads are removed if you upgrade to the Pro version.
With the free version, you can re-share or copy images and text for use in other apps. The following additional features are available in the Pro version:
You can modify text notifications directly from the notification. This allows you to remove unnecessary information from notifications to make them smaller and/or easier to read. Or you can add additional information or notes.
You can Save image notifications to anywhere on your phone. Currently this is only available on Android 4.4 (KitKat) or newer.
There is a customisable limit to the number of notifications that can be shown at the same time, and that will be saved in the history. As new notifications are created, the older ones will be removed.
But further to this, the Free version limits the maximum number of saved notifications that can be restored to 10, and the maximum number of simultaneous active notifications to 2. With the Pro version, these limits are removed and you are free to set the maximum to any value you wish.