# M66B/NetGuard

A simple way to block access to the internet per app

Repository: https://github.com/M66B/NetGuard
Canonical: https://ross.abutalabs.com/products/netguard
Homepage: http://www.netguard.me/
Language: Java
License: GPL-3.0
License Family: copyleft
Last push: 2026-08-01T21:29:40+00:00

## Health v2 (maintenance only)
Score: 92/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 95, release rhythm 83, longevity 100
- inputs: {"age_days": 3966, "days_push": 32, "days_rel": 32, "gap_med": 35.5, "n_releases_24m": 7}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3849, forks 356 (observed 2026-08-28T04:08:24.195735+00:00)

## What it is
NetGuard is a free and open-source no-root firewall application for Android that blocks internet access per app using a local VPN. It allows users to individually allow or deny Wi-Fi and mobile data access for applications and addresses to reduce data usage, save battery, and increase privacy.

## Use cases
- block an app from using mobile data but allow wifi
- no-root firewall for android
- stop apps from calling home
- block ads on android using a hosts file
- reduce data usage and battery drain
- log and analyze outgoing network traffic per app
- block internet access when roaming

## When to choose
- you want per-app internet access control on Android without rooting
- you need an open-source firewall with no tracking or ads
- you want optional ad blocking via hosts files or per-address filtering

## When to avoid
- you need to filter traffic on non-Android devices
- you need a root-based firewall with iptables-level control
- your device is not compatible with the VPN-based approach or runs Android below 5.1

## Facets
- artifact type: application
- maturity: active
- function: security, privacy, networking
- domain: privacy, android-tools, security, networking
- platform: -
- tags: firewall, no-root, ad-blocking, vpn-based, traffic-filtering, open-source, android

## Member repositories
- M66B/NetGuard (main) score 92

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:24.195735+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:25:58.444176+00:00, confidence not recorded.
  - readme: https://github.com/M66B/NetGuard (fetched 2026-08-28T04:08:24.195735+00:00, sha d92d646b3e41)
  - homepage: http://www.netguard.me/ (fetched 2026-08-29T09:20:34.197810+00:00, sha 1bfbb3b2b0b2)
- Data as of 2026-08-30T08:39:29.467469+00:00.