On December 15, 2022, GitHub officially sunsetted Atom — the open-source code editor it had built and maintained for nearly a decade. The 2022 sunset of Atom marked the end of a remarkable chapter in developer tooling. For many developers, especially those who wrote HTML and CSS in the mid-2010s, Atom was their first serious code editor. Its discontinuation prompted a wave of nostalgia, debate, and questions about what comes next.
This retrospective examines what made Atom special, the technical decisions that ultimately made it uncompetitive, and the options available to former Atom users today.
What Was Atom?
Atom was a free, open-source code editor created by GitHub and first released publicly in 2014. GitHub called it "a hackable text editor for the 21st century" — and that tagline captured its core philosophy perfectly. Everything in Atom was designed to be customizable and replaceable.
Unlike traditional editors built in C++ or native GUI frameworks, Atom was built on Electron — a framework (also created at GitHub) that lets developers build desktop applications using web technologies: HTML, CSS, and JavaScript. This meant Atom itself was essentially a web app running in a Chromium browser window. And this had profound implications, both for its strengths and its eventual downfall.
What Made Atom Revolutionary
Hackable Extensibility
Atom's extensibility model was unlike anything before it. Because the editor was built with web technologies, any web developer could write a plugin for it. You didn't need to know C++, Java, or Vimscript. You wrote JavaScript, and your plugin had access to the full Atom API — which could modify UI, hook into the file system, intercept key bindings, and more.
This democratization of editor extensibility led to an explosion of community packages. Within a few years, the Atom package registry hosted tens of thousands of packages covering everything from Git integration to real-time collaboration.
Teletype — Real-Time Collaboration
In 2017, GitHub released Teletype for Atom, enabling multiple developers to edit the same file simultaneously in real time — collaborative coding directly in the editor, years before VS Code's Live Share. For HTML/CSS pair programming, it was genuinely impressive.
Git Integration
As GitHub's own editor, Atom had deep Git and GitHub integration built in. You could stage changes, write commit messages, push to GitHub, and manage pull requests without leaving the editor. For developers hosting their HTML/CSS projects on GitHub, this made for a seamless workflow.
A Beautiful, Themeable Interface
Atom's UI was stunning by the standards of 2014. It shipped with a dark theme (One Dark) and a light theme (One Light) that became so popular they were later ported to VS Code, Sublime Text, and dozens of other editors. The One Dark theme in particular remains one of the most-installed VS Code themes a decade later.
The Package Ecosystem
Key Atom packages for HTML and CSS developers included:
- emmet — abbreviation expansion for HTML/CSS
- pigments — color visualization inline in stylesheets
- atom-beautify — code formatting for HTML, CSS, JS
- linter-htmlhint — HTML validation
- autocomplete-html — tag and attribute completion
- minimap — a scrollable code minimap in the sidebar
- file-icons — colored icons for file types
The Beginning of the End: Performance Problems
Almost from launch, Atom had a performance problem. Because it was built on Electron (Chromium + Node.js), it was slow to start and consumed significantly more RAM than native editors like Sublime Text or Vim. Opening a large HTML file or a project with many CSS files could make Atom noticeably sluggish.
GitHub engineers worked on performance improvements for years. They introduced a native text editor core, replaced their custom DOM-based rendering with a C++ layer, and made numerous optimizations. But the fundamental architectural ceiling of running a full Chromium browser as your editor host was difficult to overcome.
VS Code Changed Everything
In 2015 — the year after Atom's public launch — Microsoft released Visual Studio Code. VS Code was also built on Electron, using the same foundation. But Microsoft's engineering team made very different architectural choices:
- VS Code was designed from day one for performance
- It used a language server protocol (LSP) architecture that offloaded language analysis to a separate process
- Its extension API was more constrained but more consistent
- Microsoft invested enormous resources in its development
By 2018, VS Code had surpassed Atom in usage among professional developers. The Stack Overflow Developer Survey showed VS Code becoming the dominant editor year after year, while Atom's share stagnated and declined.
The irony was sharp: VS Code validated the Electron-based web-tech editor concept that Atom pioneered, but executed it far more successfully. GitHub had created its own most dangerous competitor.
Microsoft Acquires GitHub
In 2018, Microsoft acquired GitHub for $7.5 billion. This put both Atom and VS Code under the same corporate umbrella. The writing was on the wall for anyone paying attention: maintaining two Electron-based editors made little strategic sense when one of them (VS Code) was winning the market decisively.
GitHub continued maintaining Atom after the acquisition, but the pace of development slowed noticeably. Major new features dried up. The engineering team's attention had shifted elsewhere.
The Official 2022 Sunset
On June 8, 2022, GitHub announced it would archive the Atom repositories and sunset the editor on December 15, 2022. The official statement cited the reality that VS Code had emerged as the dominant editor and that maintaining Atom in parallel was no longer sustainable.
"We are archiving Atom and all projects under the Atom organization for an official sunset on December 15, 2022. Between the launch of Atom in 2014 and now, the landscape of developer tooling has changed enormously... we've decided to retire Atom in order to focus on enhancing GitHub and enabling developers to build better software." — GitHub, June 2022
The announcement was met with a mix of nostalgia, frustration, and resignation. For many developers, it was the end of an era.
Atom's Legacy
Despite its discontinuation, Atom's legacy is enormous:
- Electron — Atom's creation of the Electron framework enabled countless other applications: Discord, Slack, VS Code, Figma desktop, and more
- Language Server Protocol (LSP) — Atom's language client work contributed to the LSP standard, now used by virtually every modern editor
- The "hackable editor" philosophy — Atom proved that deeply extensible, web-tech-based editors were viable and desirable, directly inspiring VS Code's extension model
- One Dark / One Light themes — Still among the most popular themes across all editors
- Tree-sitter — Atom's team developed the Tree-sitter incremental parsing library, which is now used by Neovim, Helix, and other modern editors for syntax highlighting and code analysis
Alternatives to Atom in 2024
Pulsar (Community Fork)
Pulsar is the most direct successor to Atom. When GitHub announced the sunset, the open-source community forked the Atom codebase and began maintaining it as Pulsar. It remains compatible with most Atom packages and preserves the familiar interface. For developers who truly want to continue in the Atom tradition, Pulsar is the answer.
Visual Studio Code
VS Code is the obvious choice for most former Atom users. The editing experience is similar (both Electron-based), the extension ecosystem is larger, and Microsoft's continued investment means it keeps getting better. Most Atom packages have VS Code equivalents. The One Dark theme, Emmet, and linting packages are all available.
Sublime Text 4
Sublime Text 4 offers a native, non-Electron alternative with superior performance. If Atom's biggest weakness for you was sluggishness, Sublime Text solves that problem completely.
Zed
Zed is a new editor built by the creators of Atom (Nathan Sobo and colleagues). It's written in Rust for maximum performance, supports collaborative editing natively, and has Tree-sitter-based syntax highlighting. It's the spiritual successor to Atom's best ideas, rebuilt with modern architecture.
For HTML & CSS Developers Specifically
If you're coming to this article because you used Atom for HTML and CSS work, the transition to VS Code is the smoothest path. Nearly everything you relied on in Atom has a VS Code equivalent:
- Atom Emmet → VS Code has Emmet built in
- Atom Beautify → Prettier extension
- Pigments → Color Highlight extension
- Teletype → VS Code Live Share
- One Dark theme → One Dark Pro on the VS Code marketplace
For quick HTML/CSS experiments or prototyping without any editor setup at all, the Live HTML/CSS/JS Editor on htmlcsseditor.com lets you write and preview HTML and CSS in the browser instantly. If you need to format legacy HTML from an old Atom project, the HTML Formatter will clean it up beautifully.