Folder Diff is a simple macOS app that compares two folders side by side and highlights file differences at a glance. Select your folders, hit Run, and immediately see which files are identical, modified, or missing on either side.
Compare two folders in a clean split layout. File status is shown with color-coded icons — green for identical, yellow for modified, red for missing — so you can spot differences immediately.
Use the filter buttons to quickly narrow down to "Left Only," "Both," or "Right Only" files. Focus on exactly what you need to review without scrolling through everything.
Both folders are scanned in parallel, so even large directories with thousands of files are processed quickly. A real-time progress bar keeps you informed every step of the way.
Running a comparison you didn't mean to? Hit Cancel at any time to stop immediately. Switch folders and start fresh without any hassle.
Compare two folders in a clean split layout. File status is shown with color-coded icons — green for identical, yellow for modified, red for missing — so you can spot differences immediately.
Use the filter buttons to quickly narrow down to "Left Only," "Both," or "Right Only" files. Focus on exactly what you need to review without scrolling through everything.
Both folders are scanned in parallel, so even large directories with thousands of files are processed quickly. A real-time progress bar keeps you informed every step of the way.
Running a comparison you didn't mean to? Hit Cancel at any time to stop immediately. Switch folders and start fresh without any hassle.
Click "Select Folder" for the left and right panels to choose the folders you want to compare. You can also drag and drop folders directly from Finder.
Once both folders are set, click the "Run Compare" button. Files are loaded and compared instantly — identical files appear in green, modified files in yellow, and files that exist on only one side in red.
Use the "Left Only," "Both," or "Right Only" filter buttons to zero in on the differences that matter to you. When you're done, simply select new folders and run again.
"I use it to check differences between my working folder and backup. It handles large numbers of files quickly and the interface is so clean — no learning curve at all."
"Perfect for checking which files changed between releases. Being able to filter by status is a huge time saver."
"I compare my NAS and local folders regularly. The progress bar is reassuring when dealing with thousands of files. Does exactly what it says."
Find answers to common questions below.