Gas Mask is simple hosts file manager for macOS. It allows editing of host files and switching between them.
Runs on Lion, Mountain Lion, Mavericks, Yosemite, El Capitan, Sierra, High Sierra and Mojave.
Drag the application from Downloads into Applications folder. The first time you launch it, it will ask for your password, because it needs escalated privilege to modify your
Gas Mask monitors
/etc/hosts system file and updates it with your activated hosts file.
Gas Mask stores your custom hosts files in
~/Library/Gas Mask directory.
Application log can be found in
~/Library/Logs/Gas Mask.log. Its worth having a look for errors in there when posting an issue.
Gas Mask usually operates in the background. It adds a tray icon, where you can access the main editor window and quickly switch between hosts files.
The main editor consists of three parts: Toolbar, a list of your hosts files on the left, and file editor on the right. Initially you will have a single file called
Original file under
Local, which is a copy of your original /etc/hosts file.
To add new files, click
Create(+) button in the toolbar and select the type of file (Local, Remote or Combined).
To remove a file, select it and press the
Remove button in toolbar.
To activate a file, select it and press
Activate button in toolbar, or select it from tray icon when the editor is hidden. Gas Mask will update the
/etc/hosts file with the currently activated file. The active file is marked with a check in the editor list, and can also be displayed next to Gas Mask tray icon (Preferences > Show Host File Name in Status Bar)
These are ordinary local files that you can edit.
These are files that Gas Mask downloads and synchronizes from remote URLs. You can adjust how often they sould update in Preferences, or force an update from tray icon. You cannot edit these files, as they are be overwriten by update.
- NOTE the current version has a bug that allows remote files only from
This is where Gas Mask shines compared to other hosts managers for MacOS. A combined file doesn't contain hosts entries, but a list of local and remote files.
A great source of curated hosts files can be found at https://github.com/StevenBlack/hosts
Gas Mask can be built with XCode 10.1