# NetGuard NetGuard is possibly the first free and open source no root firewall for Android. Features -------- * No root required * Simple to use * Free and open source * No extra battery usage * No calling home * No tracking (analytics) * No ads NetGuard doesn't even require internet permission. Usage ----- * Enable the firewall using the switch in the action bar * Allow/deny Wi-FI/mobile internet access using the icons at the right side of the application list Permissions ----------- * ACCESS_NETWORK_STATE: to check if the device is connected to the internet through Wi-Fi * RECEIVE_BOOT_COMPLETED: to start the firewall when starting the device Frequently asked questions -------------------------- **(1) Can NetGuard protect my privacy?** Not really, since the firewall cannot be started right after starting your device and because updating firewall rules require momentarily turning off the firewall. **(2) Can I use VPN applications while using NetGuard?** If the VPN application is using the [VPN service](http://developer.android.com/reference/android/net/VpnService.html), then no, because NetGuard needs to use this service too and Android allows this to just one application at a time. **(3) Can I use NetGuard on any Android version?** No, because the method [addDisallowedApplication](http://developer.android.com/reference/android/net/VpnService.Builder.html#addDisallowedApplication(java.lang.String)) is being used the minimum required Android version is 5.0 (Lollipop). **(4) Will NetGuard use extra battery power?** No, unlike most of the similar closed source alternatives. Support ------- * Questions: please [use this forum](http://forum.xda-developers.com/showthread.php?t=3233012) * Feature requests and bugs: please [report an issue](https://github.com/M66B/NetGuard/issues/new) Please do not use GitHub for questions. Contributing ------------ Please note that you agree to the license below by contributing, including the copyright. License ------- [GNU General Public License version 3](http://www.gnu.org/licenses/gpl.txt) Copyright (c) 2015 Marcel Bokhorst ([M66B](http://forum.xda-developers.com/member.php?u=2799345)) All rights reserved This file is part of NetGuard. NetGuard is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your discretion) any later version. NetGuard is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with NetGuard. If not, see [http://www.gnu.org/licenses/](http://www.gnu.org/licenses/).