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What is Mercurial?

Mercurial is dedicated to speed and efficiency with a sane user interface. It is written in Python. Mercurial's implementation and data structures are designed to be fast. You can generate diffs between revisions, or jump back in time within seconds.
Mercurial is a tool in the Version Control System category of a tech stack.

Who uses Mercurial?

Companies
42 companies reportedly use Mercurial in their tech stacks, including Bitbucket, Deveo, and Performance Assessment Network (PAN).

Developers
124 developers on StackShare have stated that they use Mercurial.

Mercurial Integrations

SourceTree, Flowdock, CocoaPods, Targetprocess, and Nuclide are some of the popular tools that integrate with Mercurial. Here's a list of all 17 tools that integrate with Mercurial.

Why developers like Mercurial?

Here’s a list of reasons why companies and developers use Mercurial
Mercurial Reviews

Here are some stack decisions, common use cases and reviews by companies and developers who chose Mercurial in their tech stack.

Tim Abbott
Tim Abbott
Founder at Zulip · | 6 upvotes · 12.5K views
atZulipZulip
Mercurial
Git

I've been excited about Git ever since it got a built-in UI. It's the perfect combination of a really solid, simple data model, which allows an experienced user to predict precisely what a Git subcommand will do, often without needing to read the documentation (see the slides linked from the attached article for details). Most important to me as the lead developer of a large open source project (Zulip) is that it makes it possible to build a really clean, clear development history that I regularly use to understand details of our code history that are critical to making correct changes.

And it performs really, really well. In 2014, I managed Dropbox's migration from Mercurial to Git. And just switching tools made just about every common operation (git status, git log, git commit etc.) 2-10x faster than with Mercurial. It makes sense if you think about it, since Git was designed to perform well with Linux, one of the largest open source projects out there, but it was still a huge productivity increase that we got basically for free.

If you're learning Git, I highly recommend reading the other sections of Zulip's Git Guide; we get a lot of positive feedback from developers on it being a useful resource even for their projects unrelated to Zulip.

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Mercurial Alternatives & Comparisons

What are some alternatives to Mercurial?
Apache Storm
Apache Storm is a free and open source distributed realtime computation system. Storm makes it easy to reliably process unbounded streams of data, doing for realtime processing what Hadoop did for batch processing. Storm has many use cases: realtime analytics, online machine learning, continuous computation, distributed RPC, ETL, and more. Storm is fast: a benchmark clocked it at over a million tuples processed per second per node. It is scalable, fault-tolerant, guarantees your data will be processed, and is easy to set up and operate.
Git
Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.
SVN (Subversion)
Subversion exists to be universally recognized and adopted as an open-source, centralized version control system characterized by its reliability as a safe haven for valuable data; the simplicity of its model and usage; and its ability to support the needs of a wide variety of users and projects, from individuals to large-scale enterprise operations.
Plastic SCM
Plastic SCM is a distributed version control designed for big projects. It excels on branching and merging, graphical user interfaces, and can also deal with large files and even file-locking (great for game devs). It includes "semantic" features like refactor detection to ease diffing complex refactors.
Magit
Magit is an interface to the version control system Git, implemented as an Emacs package. Magit aspires to be a complete Git porcelain. While we cannot (yet) claim that Magit wraps and improves upon each and every Git command, it is complete enough to allow even experienced Git users to perform almost all of their daily version control tasks directly from within Emacs. While many fine Git clients exist, only Magit and Git itself deserve to be called porcelains.
See all alternatives

Mercurial's Followers
133 developers follow Mercurial to keep up with related blogs and decisions.
Michael Hand
Mohamma76685757
Karl Meinkopf
dotku
André Eduardo Pérez Álvarez
Branko Vukmirovic
tellkonkle
Aldrik KLEBER
Mark Dhas
GadgetSteve