SimpleumSafe 3.5.2 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this Mac application is Simpleum Media GmbH. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The software lies within Security Tools, more precisely Personal Security.
From the developer:
SimpleumSafe helps you archive your files and documents easily and safely. Adding files to SimpleumSafe from other apps is done easily. You can organize all your files in one place. To encrypt files or folders, you just need to drag the items from the Mac “Finder” into SimpleumSafe. Then, you can organize your files as you do in Mac “Finder”: view files, edit, rename, comment and tag them, and your data always remain encrypted.
You may want to check out more software for Mac, such as Secret Folders, Keychain Minder or Private Contact, which might be related to SimpleumSafe.