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What are the best git conflict resolution tools for macOS?

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Kdiff3 vs Magit vs vimdiff

 vs Beyond Compare vs Kaleidoscope vs Merge Conflicts plugin for Atom

Specs

Platforms

Windows, Linux, Mac

License

-

Release Date

-

Pricing Model

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Platforms

Any supported by Emacs (Linux, Windows,macOS,*BSD...)

License

GPLv3

Release Date

-

Pricing Model

-

Platforms

-

License

-

Release Date

-

Pricing Model

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Platforms

Windows; Mac; Linux

License

Proprietary

Release Date

October 19, 2023

Pricing Model

-

Platforms

Mac

License

Proprietary

Release Date

-

Pricing Model

Subscription ($8/month)

Platforms

-

License

-

Release Date

-

Pricing Model

-

Pros + Cons

Pro
 Open Source

KDiff3 is completely free to download and use. It's also open source.
Comment

Pro
 Can compare directories

It is able to compare whole directory trees
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Pro
 Supports 3 way merges

For modern version control systems, 3way merge support is a basic requirement, but many other open source diff viewers do not adequately handle 3way merges.
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Con
 No precise editing of the compared files

Precise work line-after-line is not possible. Only a version after the automated merge-step is editable, but not the two files separately.
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Con
 Cannot do inline diffs

Comparison of 2 files is always side-by-side and there's no option for inline views. Overall a rather poor and confusing UI in general.
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Con
 Subscription-only ($14/mo)

License used to be expensive (~€150), but worth it. Subscription sucks.
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Pro
 Problems when files have different number of lines

For example, if you add 3 lines: A, B and C locally but on the other change there are only A and C, Kdiff3 will work out that A was added, then it says that B conflicts with C but adds C again anyway.
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Pro
 Supports editing files directly

In addition to comparing two files it also allows you to edit the merge result right in place.
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Con
 The user interface is a bit dated

Kdiff3's UI is a bit dated unfortunately. It looks like a Windows XP application.
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Pro
 Manual code aligning

With selecting code in one window and hitting Ctrl+Y, then selecting some other code in second window and also hitting Ctrl+Y you can manually align the code.
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Pro
 Powerful rebasing

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Pro
 Stage hunks or even just parts of a hunk using a single key press

In Magit staging a hunk or even just part of a hunk is very easy. Magit also implements several other "apply variants" in addition to staging and unstaging. For example: you can also discard or reverse a change, or apply it to the working tree.
Comment

Pro
 Diffs are easy

Since it's integrated with Emacs, diffs are very easy to fix. You can jump right to any file you want to fix as soon as it comes up in the logs or in the status view.
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Pro
 Mouse-free interface

It's practically vim, this means that the whole interface is mouse-free, this increases development speed significantly since you are only using the keyboard.
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Pro
 Helpful to people who work a lot inside the terminal

Using command-line tools (vim/git) keep you stick in the terminal.
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Pro
 Lightweight

Since it's inside vim, it's very lightweight and fast. It fires up quickly and it does all operations painlessly.
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Con
 Not for people who are not used to vim

Since this is basically a vim feature, it's clear that people who aren't used to vim and its keyboard-based interface would find it very hard to work with vimdiff.
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Pro
 Supports 3 way merge

Good overview. Clear display of changed lines (background color) and changed characters (foreground color).
Comment

Pro
 Works well with large files

Comment

Pro
 Customer Service is awesome and easy to work with

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Pro
 One license covers all major OSs (Linux/Windows/Mac)

Comment

Pro
 Has rules for adding ignore-masks and replacement rules

So parts you don't want to see in your comparision can be hidden with ignore masks. Parts that are okay to be changed can be set with change-lists so beyond compare knows what's the replacement value and skips displaying this. So you can focus on the for you important changes. For example with the ignore mask I was able to compare two logs with different timestamps but nearly same content. (beginning with timestams the first x characters adding to ignore)
Comment

Pro
 Opens popular archive formats as directories

Compare archive to directory or to another archive, update ZIP archives by copying files from other side or by editing them directly in compare view.
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Pro
 Can be used to compare image files

This is a useful feature for game developers using Git.
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Pro
 Synchronize folders

Can be used to synchronize folders. Including wildcards.
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Pro
 Supports editing files directly

Comment

Pro
 Supports comparing folders

Beyond Compare can be used to compare both files and folders. File-Filters possible.
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Pro
 Can compare remote directories

Beyond Compare can compare directories through FTP, SFTP. Also it can compare directories hosted on Dropbox or Amazon S3.
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Pro
 Has file conversion/preprocessing feature

You can run a script or executable based on file extension before showing a file. Great for beautifying XML, extracting text from MS Office documents, running dis-asm etc.
Comment

Con
 Paid proprietary software

Beyond Compare is not free, it offers different license options depending on the number of members in a team and depending on the software version.
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Pro
 Simple UI

Kaleidoscope has a beautiful and simple UI. It displays the two files that are being compared side to side, highlighting all the differences in a way that's easy to understand.
Comment

Pro
 Image difference viewer

Kaleidoscope supports image diff viewer in addition to git diff. It's able to find even the slightest changes between two versions of the same image.
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Pro
 Diff within a line

When working in code, line-by-line diff can still be hard to spot small changes within the line. Kaleidoscope will highlight what has changed.
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Pro
 Supports comparing folders

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Pro
 Keyboard friendly

You can quickly fly through manual conflicts, resolving using mostly keyboard shortcuts.
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Pro
 Inline editing

You can edit the merged result right there inside Kaleidoscope.
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Con
 Paid software

Kaleidoscope is not free, since version 4 subscription-only ($14 per month), before $180 for full version (version 3, late 2022),
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Con
 Mac OS only

Kaleidoscope is a Mac OS X only app.
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Con
 Abandonware

No updates since November 2017, the maker "Black Pixel" has been acquired by hypergiant.com.
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