Downloading apfsconvert 1.0.0 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The software lies within System Tools, more precisely System Optimization. This free Mac app was originally developed by Paragon Technologie GmbH.
From the developer:
APFS to HFS+ Converter helps you create a recovery media to boot up your Mac and then convert the system volume. The tool provides fast and lossless conversion of APFS volumes into HFS+ volumes. It supports APFS and HFS+ volumes on internal and external disks.
You may want to check out more software for Mac, such as TrashMagic, DevonSync or Visage Login, which might be related to apfsconvert.