# RKNHardering (open-source privacy app)

> RKNHardering is a free, open-source privacy app for Android. Detects VPN and proxy usage on Android using RKN methodology. It has 1,471 GitHub stars and is released under the AGPL-3.0-only license, and you can install it from F-Droid.

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…

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/xtclovver/RKNHardering |
| Platforms | Android |
| Built with | Kotlin |
| GitHub stars | 1,471 |
| License | AGPL-3.0-only (open source) |
| F-Droid | https://f-droid.org/packages/com.notcvnt.rknhardering/ (package com.notcvnt.rknhardering) |
| F-Droid anti-features | Depends on the developer's own network service |
| Google Play | not linked |
| App Store | not linked |
| Website | none listed |
| Official | no |
| Category | Privacy, ad-blocking & VPN |
| Latest release | v2.11.0 (Jul 26, 2026) |
| Last commit | Jul 26, 2026 |

F-Droid builds its apps from source and flags anti-features: https://f-droid.org/en/docs/Anti-Features/

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