Our firewall protects your privacy by automatically blocking trackers in the background when you use other apps on your device. At the moment, this feature is available in the iOS version of 1Blocker because the necessary tools are supported by iOS only.
Trackers collect as much information about you as possible. It then can be sold to third-party companies or stored for future use. The information collected usually contains your personal details, such as your interests, financial situation, your location, and so on.

Firewall prevents app trackers from even connecting to the Internet.


How does Firewall work?

First of all, everything is done locally on your device only. Firewall runs in a network extension and acts as a local proxy between you and the Internet. When it sees a request is being sent to a block-listed host, the extension just drops the connection. Other requests stay untouched and work just like before.
We install a local VPN profile to perform on-device security checks of all internet connections other apps make. No traffic or data is sent to our servers. Firewall blocks outgoing network traffic to some domains using open-source domain lists maintained by the filter community. It operates at the network level, so you will stay protected no matter what app you use.

Does Firewall block ads?

The main purpose of the Firewall is to protect your privacy against in-app tracking. While it may block some ads along the way, not all ads can be blocked using this approach. For example, YouTube and Instagram ads are impossible to block even with Firewall enabled.

Can Firewall be used alongside another VPN?

Unfortunately, no. Firewall installs its own local VPN profile to perform on-device security checks. iOS currently does not support multiple active VPN profiles.

Firewall and Safari content blockers

A Safari content blocker is an extension that can block ads, trackers, widgets, and other unwanted content. This type of extension can only work in Safari.

Firewall protects you from trackers across all apps you use on your iOS device.

Firewall and Safari content blockers are completely independent and complement each other. We recommend using both for better privacy protection.