6.2.0 • Public • Published

Slack Theme Collection

Beautify your Slack application from a list of popular themes!!!

Currently works only for Mac OS, Windows and Linux non-SNAP (Marketplace)

Theme List:

  • Material Oceanic oceanic.png
  • Material Darker darker.png
  • Material Palenight palenight.png
  • Material Lighter lighter.png
  • Material DeepOcean deepocean.png
  • Monokai Pro monokai.png
  • Arc Dark arcdark.png
  • Dracula dracula.png
  • GitHub github.png
  • Atom One Dark onedark.png
  • Atom One Light onelight.png
  • Solarized Dark solardark.png
  • Solarized Light solarlight.png
  • Night Owl nightowl.png
  • Light Owl lightowl.png


If you like this plugin, you can buy me a beer (or a coffee, or something else) using PayPal

You can also support this theme by subscribing to the Material Theme OpenCollective. [Become a sponsor]


Thank you to all our backers! 🙏 [Become a backer]

Check also : http://www.material-theme.com/docs/support-us/


Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [Become a sponsor]


Global installation (works anywhere)

  1. Run npm install -g @mallowigi/slack-themes in a terminal
  2. Run the command mtslack
  3. PROFIT!!!
  • You will be prompted with a menu with two options:

    • Apply Theme
    • Remove Theme
  • Select Apply Theme to be prompted with a list of themes to choose with.

  • Open or Restart (with Cmd-Q) Slack

  • ?????

  • PROFIT!!!!!!!

From npm

  • Clone this repository
  • Install NodeJS if you didn't do it yet (https://nodejs.org/en/download/)
  • Run npm install
  • Run npm run apply
  • Select Apply in the menu, then select a theme from the predefined themes.
  • Open or Restart (with Cmd-Q) Slack
  • ??????
  • PROFIT!!!!!!

Revert to the default theme

The best way to revert to the default theme would be to use the backup copy you made and overwrite the patched Slack.app

There is also a Remove Theme option in the menu but it is less robust.

Slack Tweaks (Beta)

Since version 2.0 you can also profit from a bunch of Slack Tweaks to make the application more enjoyable.

Slack Tweaks

Enabling these tweaks create a new icon in the Slack Toolbar to toggle the desired tweaks.

More will come later!

Note Currently switching between Slack Workspaces would restore the default behavior, e.g. the tweaks not showing in the app.

You can forcibly relaunch them by pressing Cmd+D (Alt-D on Windows/Linux).


These tweaks are currently in a very early release. It can causes some problems, especially every time Slack updates their application.


Building styles

This project consists in two parts:

  • The CLI, used for applying the styles
  • The Styles, written with Sass (Node-sass)

The cli is found in the lib directory while the styles are found in the styles directory.

Then run npm run styles or npm run debugStyles to compile the scss files in dist/slack.min.css or dist/slack.css

Apply the styles

Using the WebApp

Open Slack on the browser. It has the useful Developer Tools available to them so you can debug with ease.

To test your CSS, install a Stylish-like extension (https://chrome.google.com/webstore/detail/stylish-custom-themes-for/fjnbnpbmkenffdnngjfgmeleoegfcffe?hl=en) then create a new style for slack and paste the CSS inside and save.

You should already see all your styles applied. Please note that there are some differences between the web app and the native app.

Using the Electron app

First of all install and run a web server

npm i -g http-server
http-server .

You can now have access to the current project directory. Particularly the dist/slack.css where the magic happens.

Then changes the url in lib/consts.js to point to http://localhost:8080/dist/slack.css to use your local styles.

Instead of launching Slack normally, you'll need to enable developer mode to be able to inspect things.

  • Mac: export SLACK_DEVELOPER_MENU=true; open -a /Applications/Slack.app

  • Linux: (todo)

  • Windows: (todo)

Live Reload

In addition to running the required modifications, you will likely want to add auto-reloading:

const cssPath = 'http://localhost:8080/dist/slack.css';

window.reloadCss = function() {
   const webviews = document.querySelectorAll(".TeamView webview");
   fetch(cssPath + '?zz=' + Date.now(), {cache: "no-store"}) // qs hack to prevent cache
      .then(response => response.text())
      .then(css => {
         webviews.forEach(webview =>
               (function() {
                  let styleElement = document.querySelector('style#slack-custom-css');
                  styleElement.innerHTML = \`${css}\`;

fs.watchFile(cssPath, reloadCss);


Apache 2.0


Thanks to https://github.com/widget-/slack-black-theme for the idea!


Apache 2.0



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npm i @mallowigi/slack-themes

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Apache License 2.0

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756 kB

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  • mallowigi