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Guiffy is a visual file compare diff tool, folder compare, and merge tool. Its features include the Trustworthy 3-way auto-merge - "SureMerge", In-Line difference highlighting, integrated folder and filetree comparisons, command line interface and API for automation, SCM integrations, and application plug-ins. Guiffy produces reports as HTML with support for color printing. File comparing options include folded views for support of large files. Supports over 150 file encoding formats such as UTF8, UTF16, MBCS, SJIS, and multi-lingual Unicode fonts.

Guiffy integrates with the following SCM systems as a value-added more...

What's New

Version 10.6:
  • Performance Improvements:
    • Optimized clear Screen functions.
    • Optimized startup for SWT (Native File/Folder dialogs).
    • Position to first diff optimized.
    • Compare/Merge view build optimized.
    • Diff/Attention navigation optimized.
  • 64-bit extensions:
    • Support for files > 2GB.
    • 64-bit line numbers and more...


OS X 10.6 or later

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Guiffy User Discussion

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printscott Member IconReview+0

I used SureMerge to upgrade my xTuple custom code with the latest release. SureMerge is undoubtedly the best merge tool I've ever used. Any other merge tool I've ever used for such upgrades has always stumbled and incorrectly performed a file merge merge at least once. SureMerge was correct 100% of the time - a real professional grade tool.

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Version 9.4
Bruderbarnabas Member IconReview+0

I'm running OSX 10.6 (Snow Leopard) and recently updated to Guiffy 9.4 - it works great. The new features in 9.x all work well. I like the Syntax Highlighting - makes my HTML and XML easier to look at. The speed of the archive file folder compare on my zip files is amazing. The feature to generate Unified Diffs comes in handy for sending changes to my partner (working together on a Drupal project).

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Version 9.4
iSeeSaw Member IconComment+5

There are some reviews here that are missing the point of this product.

If FileMerge and/or commandline tools will meet your needs then, by all means, use them and save yourself a few bucks. But if you need some more advanced features, Guiffy is a good, professional product. In my case, I bought it for the graphical three-way merge.

Sure, it's implemented in Java and looks it. But this is a tool for getting work done, not sitting back and admiring the Core Animation transitions. When you're drowning in 12 variations on the same codebase (what were they smoking?), as I was, the java-y controls won't bother you at all. You'll be too estatic that what seemed like a difficult, error-prone, weeks-long process of updates and verification is actually going to be a short and simple task. There's nothing like using the right tool for the problem, and Guiffy is that tool when FileMerge, et. al. aren't enough.

(Note: I used the previous version, but I did not experience any problems with an earlier update, so I'm not too worried about 9.)

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Version 9.0 (270)

Many apps accomplish the same power but also incorporate a nice GUI and cheaper. Changes and Deltawalker come to mind. Deltawalker is $20 cheaper, also made in java and looks more pleasant than Guiffy. The second, Changes is $10 cheaper and connects with many other common text editors for os x and even so you don't need those editors to use Changes. All in all, the app works, but so do others that are cheaper and manage to incorporate a nice GUI. Nobody is missing on what the app does or how powerful it is they are just pointing out that the app could be super powerful and still be a bit easier on the eyes like the apps I mentioned. No doubt, all of them do their job. Just a matter of preference.

Guiffy Software, Inc. (Developer)

Regarding these price comparisons:
Guiffy SureMerge has one price ($59), includes all features, for all platforms.
1) "Deltawalker is $20 cheaper". Deltawalker has 4 different prices. Personal Standard is $39, Commercial Standard is $99. So, Deltawalker could be $20 cheaper or $40 more expensive. The Standard version does not include a 3-way merge and is for only 1 platform. The Pro version includes a 3-way merge and can be used on all platforms supported (Mac, Linux, Windows). Personal Pro is $75 (that's $16 more expensive than Guiffy). Commercial Pro is $189 (that's $130 more expensive than Guiffy).
2) "Changes is $10 cheaper". Changes does not have a 3-way auto merge. Changes is only available for the Mac.

Overall, I have to say the price comparisons mentioned with the suggestions that all 3 applications work and do the same thing is very misleading.

Finbar Member IconReview+3

I have been using Guiffy since Version 7.2 on my G5 Power Mac and just installed 8.2 on my new MacBook Pro running OS 10.5 (Leopard) and it is working there too.

I particularly like the inline difference highlighting of the file compare. When we got a project folder update from our outsourced contractor with Unicode file and folder names and some case differences in the names --- Guiffy made it clear what was going on. I wish all our other tools had such useful features.

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Version 8.2
Anonymous Member IconReview

Guiffy is the best GUI application for file differencing and merging I tried. I tested it on MacOS 9, MacOS X and Windows. I also used it in three different ways:
1. As a stand-alone.
2. As a plug-in to version control applications; StarTeam and CVS.
3. As an API library for adding file differencing and merging capabilities to existing applications.
The author has been very responsive to my suggestions which often found their way to subsequent releases.

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Version 6.1 (B 116)
Anonymous Member IconReview

PROS: The compare and merge functions are well done. I especially like the character-by-character highlighting of differences.

CONS: It's a java application so it can be a bit slower than native software on some platforms.

CONCLUSION: Overall a good product. And the company is very responsive to comments from its users.

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Version 5.0
There are no Ratings for this App yet.
> 4 5


Current Version (10.x)


Downloads 13,038
Version Downloads 52
License Demo
Date 02 Jul 2014
Platform Intel 64 / OS X / Intel 32
Price $37.50