At this point those products are mostly an anachronism. The good news is that at least Disk Utility can now do a better job of it than it could a decade or two ago when it always seemed to be a disappointment in that regard, which made Disk Warrior and TechTool Pro popular and in some cases invaluable. DiskWarrior has the power to find your precious documents, movies or photos which have gone missing or cannot load properly. Nothing outside of Apple's own DiskUtility can repair the directory on a drive formatted as APFS. It's just that if you expect them to be able to do the sort of near-miraculous repair of a failing APFS formatted drive that DiskWarrior was once famous for doing on HFS+ drives, you will be sorely disappointed. DiskWarrior analyzes and rebuilds your hard- drive directory structure if it finds any problems, and it has even returned hard. This is not to say that TTP and OnyX aren't useful tools in some instances. OnyX doesn't make any claims to being able to repair the directory on your hard drive, not even your HFS+ formatted drive. DiskWarrior diagnoses common file problems. Some bad blocks, bad sectors and media errors will not stop DiskWarrior. Apple has recently released the APFS format documentation. The next major release of DiskWarrior will include the ability to rebuild APFS disks. Just plug a new drive into your Mac and let DiskWarrior copy your good files from the failing hard drive to the new drive. Alsoft (DriveWarrior) is completely misleading and wrong: Using DiskWarrior 5.2 while started (booted) from High Sierra or Mojave. If you look through MicroMat's Web site for TechTool Pro, they do their best to try and make you believe that TTP can repair the directory on an APFS formatted drive, but if you read their page very carefully, you will find that they more or less explicitly admit that TTP doesn't have that ability. DiskWarrior is so advanced it can even recover your data from a failing drive. They can do other, mostly minor things, but because Apple hasn't released the specs for APFS (and it seems as if they never intend to), no third party hard drive repair utility will ever be able to repair the directory on an APFS drive. Neither one can repair the directory on an APFS formatted drive. That isn't accurate if one is referring to repairing the directory on APFS drives. Folks in this thread have stated that both TechTool Pro and Onyx can repair APFS formatted drives.
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