When comparing Double Commander vs HashMyFiles, the Slant community recommends Double Commander for most people. In the question“What are the best file integrity checkers?” Double Commander is ranked 2nd while HashMyFiles is ranked 8th. The most important reason people chose Double Commander is:
You can use same tool in all desktop OS environments.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Multi-platform (Linux, Windows, MacOS X)
You can use same tool in all desktop OS environments.
Pro Source code is available (true free software)
If the developer loses interest there is at least the possibility that someone else will pick up the torch.
Pro Configurable
Lots of options allow you to configure DC the way it suits you best: Tools, Fonts, Colors, Hotkeys, Mouse, Fileviews, Plugins, Layout, Toolbars, Tabs, Icons etc.
Pro Directory Hotlist
Save shortcuts to folders. Organize them in a treeview with submenus. Define a name and sorting for each entry.
Pro Powerful tcmd-like search tool (alt+F7)
Pro tcmd-like multi-rename tool (CTRL+M)
Pro DC uses TCmd plugin API
so you can use documentation from Total Commander for writing plugins. WCX (packer), WDX (content), WFX (file system), WLX (lister).
Pro Closely follows TotalCommander UX
For instance, the 'Settings | Layout' pane is quasi-identical to TCs.
Pro Very sophisticated
Although it is lightweight and simple to use, it can do very sophisticated tasks, like copying files from directories which have a certain extension or file size or have a certain text pattern in them. Also, it's very customizable and stable.
Pro It's that good, you can replace tcmd on windows too
Pro Source code written in (Object) PASCAL
It's all a matter of perspective. I'm not for an argument about IDE's, frameworks etc, but to me that's a big plus. I think it should be a tie, it's either a pro or a con or should that be neither a pro nor a con. It just depends on context.
Pro Can hash multiple files at once and automatically highlight any that are exact duplicates
Each distinct pair or set of duplicates is highlighted in a different color and is assigned a number to identify and distinguish from other duplicates.
Pro Portable or optionally integrated with File Explorer's context menu
Pro Three different ways to add one or more files to the overall list to be hashed
Select files using the program's file picker, or drag-and-drop onto the program window, or use Windows File Explorer's right-click menu (if optional File Explorer integration has been enabled).
Pro Supports MD5, CRC32, SHA1, SHA-256, SHA-512, and SHA-384 checksum formats
All of these hash types can be calculated simultaneously for multiple files.
Pro Current release supports Windows versions as far back as Windows 2000 and XP
An older release is available that supports Windows 98.
Cons

Con Apparently only one developer
Con Freeze after mouse double-click on directory list item
Con Much slower on Linux and Mac than on Windows
Con Source code written in Pascal language
But this does not affect users negatively. It's just programmers problem.
Con Not developed anymore for Mac
Con Can't edit files on remote FTP servers
