Lockdown, a new app launching today, is designed to be an open source firewall, letting users block any connection to any domain, including those that use ad tracking services and analytics platforms to monitor device usage.
Lockdown is free to download and use, and because it operates on device, it collects no user data. Lockdown uses Apple's VPN setup to function, although it is not a VPN and will not obscure your own IP address
This sounds great, although it looks like you have to manually enter the domains to block, and they are blocked globally and Permanently. , Little Snitch on the Mac prompts you interactively, its blocks can be temporary, and you can have different settings for each app. [Lockdown Apps] Note that the actual name of the app in the App Store is "Lockdown Apps". That's currently the fifth app in the list when I search for "Lockdown."
The source is available here. Being able to compile it yourself — from code that anyone can inspect — makes it a bit more trustworthy than downloading the version from the App Store, which you can't try to match the published source.
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