Blocker+ - Android VPN Ad Blocker

⚠️ Under Maintenance — This app is currently being refactored and tested. Some features may be incomplete or subject to change.

A VPN-based ad blocker for Android that blocks ads, trackers, and adult/18+ content via local VPN traffic filtering with SNI sniffing and DNS interception.

Features

• Blocks ads from major ad networks via DNS blackhole + TCP relay
• HTTPS ad blocking via TLS SNI sniffing
• Adult content filtering (domains + keywords)
• Gambling content filtering
• Custom blocklist (add your own domains)
• Whitelist (bypass blocking for specific domains)
• Per-app filtering (select which apps go through the VPN)
• Multiple DNS server presets (Google, Cloudflare, OpenDNS, Quad9, Custom)
• Block log with real-time stats
• Remote blocklist update (download from GitHub sources)
• Hosts file import
• No root required

Requirements

• Android: 5.0 (API 21) or higher
• Permissions: VPN (for traffic filtering), Notification (for foreground service)
• Storage: ~7 MB

How to Use

Install

1. Download the APK from Releases
2. Enable "Install from unknown sources" if needed
3. Open the app

Setup

1. Open Blocker+
2. Tap START
3. Accept the VPN permission prompt
4. You'll see "Protected" — ad blocking is now active

Toggle Adult Content Blocking

• The Block Adult Content switch is ON by default
• Toggle it OFF to allow adult sites while still blocking ads
• Changes apply immediately — no need to restart

Build from Source

git clone https://github.com/welbert23/Adblocker-.git
cd Adblocker-
./gradlew assembleDebug

APK output: app/build/outputs/apk/debug/app-debug.apk

How It Works

1. Creates a local VPN interface that captures all device traffic via 0.0.0.0/0 routing
2. Intercepts DNS queries (port 53) and checks domains against blocklists
3. For blocked domains: returns 0.0.0.0 (blackhole), preventing connection
4. For safe domains: forwards the DNS query to the selected DNS server
5. Intercepts TCP connections and extracts SNI from TLS ClientHello for HTTPS blocking
6. Relays non-blocked TCP traffic through a protected socket
7. Forwards UDP traffic (non-DNS) bidirectionally
8. Supports a local HTTP/HTTPS proxy (port 9898) for additional filtering

Recent Changes

• Full TCP relay with SNI-based HTTPS blocking via TLS ClientHello parsing
• Per-app filtering (select which apps are routed through the VPN)
• Remote blocklist updater with 3 sources (anudeepND adservers, StevenBlack porn-only, StevenBlack gambling-only)
• Import hosts file support
• Whitelist management
• DNS server presets (All, Google, Cloudflare, OpenDNS, Quad9, Custom)
• Redesigned logo (AdGuard-style green shield)
• Block log with real-time auto-refresh
• Fixed clearStats() to only clear statistics (no longer wipes all preferences)
• Fixed per-app filtering logic (addAllowedApplication instead of addDisallowedApplication)
• Simplified UI — Settings-only layout
• Fixed notification to show static "Active" status
• Fixed ClassCastException on launch (ScrollView vs LinearLayout type mismatch)

License

MIT