Spot the differences. Merge in seconds.

With text merge, three-way merge, folder comparison, and the ability to ignore whitespace-only differences, Kaleidoscope integrates perfectly with the version-control systems you already use.


Easy Workflow Integration

- Subversion, Git, Mercurial, Bazaar, and Perforce support
- Works as a fully functional diff or merge tool
- Supported by a growing list of GUI source control management apps

Two-Way Text Comparison & Merging
- Three powerful display modes
- Super-fast diffing of lines and character-level changes
- Color coding to spot added, deleted, and changed text

Three-Way Merge
- Review code changes and resolve conflicts
- Intelligently auto-merge the right content

File & Folder Comparison
- Ultra-fast algorithm for finding differences in large folders
- Sort and filter down to what matters most
- Drill deeper into folders for more detailed comparisons
- Copy your preferred files across sources

Powerful Image Comparison
- Compare images side by side, stacked, or split
- Spot subtle pixel differences with a high contrast “difference mask”

Optimized for macOS
- Beautiful, modern UI made to feel at home on your Mac
- Full-screen mode for focusing on your content
- Looks gorgeous on retina displays and works wonderfully with high-resolution graphics


"Kaleidoscope epitomizes the concept of “versatile software”: anyone can pick it up and use it, and the app will “scale” according to a user’s needs." - Federico Viticci,

"Kaleidoscope 2 is breeze. I wish I'd had something like Kaleidoscope when I wrote my first novel, and I'll be counting on it when I finally get around to writing the next one." - Rene Ritchie,

"It’s beautifully designed, fast and wonderful to use. It’s become an essential part of my toolkit already." - Matthew Panzarino, The Next Web

"The new Kaleidoscope is great, and has awesome and committed people behind it. Devs and designers need this tool." - @SteveStreza

"I just bought Kaleidoscope app! It has already saved my time greatly once (by comparing SQL from clipboard). Thank you!" - @befive_info

"Kaleidoscope 2 is the best merging tool for the Mac, hands down. I finally don't miss BeyondCompare." - @stefankendall


If you have any questions or feedback about Kaleidoscope, please contact us at
Learn about important Kaleidoscope updates and announcements by following @kaleidoscopeapp and @hypergiant on Twitter.

What’s New

Version 2.3.3

• Update contact information to, don't be shy and say hi!
• Fixed newsletter sign-up in the Help > Getting Started window.

Ratings and Reviews

3.3 out of 5
31 Ratings

31 Ratings

bri.gui ,

Good, Bad, Ugly…

There's a lot of goodness in this app. It's visually clean, mac-like, and fluid. And yet, it drives me crazy. I haven't had problems with crashes, but writing the developer with basic questions is like tossing stuff into a black hole. And there's just no transparency on support for key features. All my developer tools have long since supported dark mode. But ask the developer when this will be released for Kaleidescope, and… crickets.

AidinK ,

Great Idea but not optimized to actually work.

I love the idea of this app and UI/UX design but sadly the app crashes too often & everytime you press copy and try to actually run the task.
So I now just use it as a visual checker and manually transfer on Finder which then it really makes this app not worth the money. I’m still willing to wait and give it a chance but you MUST work on the backend to fix these crashes and review the crash reports plz.

One thing i would like added is a progress bar or a Que to see that status of individual tasks or all tasks. PLEASE fix the crashing issues.
Working on an iMac Pro just FYI if that helps.

NJKnight ,

Indespensible tool to compare all the things

I've loved this app since it first came out. Comparing images, directories, and git merges in a visually appealling and easy to understand format has been an enourmous time saver.

Do I wish it were updated more frequently with low hanging fruit fixes? Sure, but that shouldn't take away from what this app does extremely well.

Developer Response ,

Thank you, NJKnight! Please let us know which low hanging fruit would be the most important to you: Cheers, Christopher


Letter Opener GmbH
23.4 MB

macOS 10.12.0 or later, 64-bit processor



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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