Rethink
Rethink is a free, open-source privacy app for Android. Firewall apps, use WireGuard VPN, monitor network, block malware, change DNS. It has 5,549 GitHub stars and is released under the Apache-2.0 license, and you can install it from F-Droid and Google Play.
About Rethink
Say hello to a safer, transparent, and secure Android. VPN: Connects to multiple WireGuard VPNs of your choice. Safe: Reveals network activity of installed apps and lets you disable, uninstall, or firewall them. Secure: First line of defense against spyware, ransomware, and malware that steal personal information and takeover accounts. Protects from DNS manipulation typically employed to censor websites, social media, and messaging apps. Fast: DNS Servers deployed to 300+ locations world-wide to ensure your internet is as fast and highly available as it can be. Open: Open source and free of any trackers. Features Firewall: Prevent apps from connecting to the Internet.
Privacy and F-Droid
F-Droid builds Rethink from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.
No anti-features flagged on the latest F-Droid build.
Screenshots
Screenshots from the app's F-Droid listing.
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What is Rethink?
Rethink is a free, open-source privacy app for Android. Firewall apps, use WireGuard VPN, monitor network, block malware, change DNS. It has 5,549 GitHub stars and is released under the Apache-2.0 license, and you can install it from F-Droid and Google Play.
Is Rethink free and open source?
Yes. Rethink's source code is public on GitHub under the Apache-2.0 license, which is OSI-approved or FSF-free. F-Droid, which builds it from source, flags no anti-features such as ads or tracking on its latest build.
How do I install Rethink?
You can install Rethink from F-Droid (package com.celzero.bravedns) and from Google Play; the links are on this page. Its GitHub repository also publishes releases (latest: v0.5.7).
Is Rethink still maintained?
The repository's most recent commit was on Sep 22, 2026. Its F-Droid listing was last updated on Sep 22, 2026. appsgit only lists apps whose repository had a commit in the last six months.