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RKNHardering

RKNHardering is a free, open-source privacy app for Android. Detects VPN and proxy usage on Android using RKN methodology. It has 1,482 GitHub stars and is released under the AGPL-3.0-only license, and you can install it from F-Droid.

github.com/xtclovver/RKNHardering (opens in a new tab)

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About RKNHardering

RKNHardering is an Android application that detects VPN and proxy usage on a device, implementing the Russian Federal Service for Supervision of Communications (RKN) methodology for identifying circumvention tools. The app runs nine independent detection modules in parallel and produces a combined verdict: - GeoIP — checks the public IP against GeoIP databases and hosting/proxy signal providers - IP Comparison — compares responses from RU and non-RU public IP checkers - Direct Signs — inspects NetworkCapabilities, system proxy settings, and installed VPN apps - Indirect Signs — analyzes network interfaces, routing table, DNS, dumpsys VPN output, and localhost proxy listeners - Location…

Privacy and F-Droid

F-Droid builds RKNHardering from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.

  • Depends on the developer's own network service

Screenshots

  • RKNHardering screenshot 1
  • RKNHardering screenshot 2
  • RKNHardering screenshot 3

Screenshots from the app's F-Droid listing.

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FAQ

RKNHardering FAQ

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Is RKNHardering free and open source?

Yes. RKNHardering's source code is public on GitHub under the AGPL-3.0-only license, which is OSI-approved or FSF-free. F-Droid flags these anti-features on its latest build: depends on the developer's own network service.

How do I install RKNHardering?

You can install RKNHardering from F-Droid (package com.notcvnt.rknhardering); the links are on this page. Its GitHub repository also publishes releases (latest: v2.11.0).

Is RKNHardering still maintained?

The repository's most recent commit was on Jul 26, 2026. Its F-Droid listing was last updated on Jul 29, 2026. appsgit only lists apps whose repository had a commit in the last six months.