DiskWarrior

DiskWarrior is a disk repair utility published by Alsoft for classic Mac OS and Mac OS X. However, it does not support rebuilding of APFS-formatted drives.

History
First released in November 1998, DiskWarrior supports data recovery and the rebuilding of HFS Plus (Mac OS Extended) drives.

APFS support
Alsoft stated that support for the Apple File System (APFS) in macOS High Sierra (10.13) and later has been delayed due to limited documentation about the drive format from Apple Inc. All new purchases require acknowledging a disclaimer of these circumstances.