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Gas Mask
Edit and switch between hosts files on macOS with Gas Mask, a hosts file manager.
About Gas Mask
Gas Mask is a hosts file manager for macOS that lets users edit, store and switch between multiple hosts files. It automatically updates the system /etc/hosts file with the user's selected active hosts file, and runs in the background with a menu bar icon for quick access. The tool supports local, remote (auto-synced from user-specified URLs) and combined hosts file types, requires macOS 13 (Ventura) or later, and needs administrator privileges to modify the system hosts file.
Key features
- Edit local hosts files directly in the built-in editor
- Switch between active hosts files via menu bar icon
- Sync remote hosts files from user-specified URLs on a schedule
- Support for combined hosts file types
- Runs in background for quick access without opening editor
- Stores custom hosts files in user Library directory
Best for: macOS users who need to edit, manage and switch between multiple hosts files.
Good for
- Supports combined hosts files, a feature the source highlights as superior to other macOS hosts managers
- Automatically applies the selected hosts file to the system /etc/hosts file
- Allows scheduled or on-demand syncing of remote hosts files from user URLs
Watch out for
- Only compatible with macOS 13 (Ventura) and later versions
- Requires administrator privileges to modify the system hosts file
- Remote hosts files cannot be edited, as they are overwritten during sync
Gas Mask at a glance
- Website
- github.com/2ndalpha/gasmask
- Category
- Privacy & Security › Desktop & OS Privacy
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- macOS
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Gas Mask FAQ
Where does Gas Mask store custom hosts files?
Custom hosts files are stored in the ~/Library/Gas Mask directory.
Where can I find the Gas Mask application log?
The application log is located at ~/Library/Logs/Gas Mask.log.
Can I edit remote hosts files directly in Gas Mask?
No, remote hosts files are overwritten during sync and cannot be edited directly.
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