Notarized and Integrity Check

Our apps, that are available for download from our website or MacUpdate, have been notarized by Apple to be free of malicious software.

“The first time you launch an app you have downloaded from an identified developer, your Mac asks if you’re sure you want to open it. An app that has been notarized by Apple indicates that it passed a security check” (Apple, 2018).

The wording that “Apple checked it for malicious software and none was detected” will be shown when opening our apps for the first time.

Notarized Download.

In addition, you can verify the checksum of our compressed app files that you have downloaded to ensure its integrity, more details are on each app’s support page.

For example, run the following command in Terminal to compute the checksum of your copy of Stamps;

shasum -a 256 ~/Downloads/

The SHA256 checksum of should be;



  1. Apple Inc., 6 September 2018, “Safely open apps on your Mac”,
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