Sentinel is described as 'Network is a network layer that enables a true p2p and decentralized applications and resources marketplace. Sentinel enables anyone to create Public and Private networks that provide access to both free and incentivized, and also payment method agnostic' and is a VPN service in the security & privacy category. There are more than 100 alternatives to Sentinel for a variety of platforms, including Windows, Android, Mac, iPhone and iPad apps. The best Sentinel alternative is Proton VPN, which is both free and Open Source. Other great apps like Sentinel are Mullvad, Windscribe, Psiphon and Hotspot Shield.