Why the Protocol Matters
A VPN protocol is the method used to create the encrypted tunnel between your device and the VPN server. Different protocols make different trade-offs between speed, security, battery efficiency, and firewall traversal. Most VPN clients let you choose the protocol or switch automatically. Knowing the differences helps you pick the right one for your situation.
WireGuard
WireGuard is the newest and fastest major VPN protocol. It uses a lean codebase (roughly 4,000 lines versus OpenVPN at 70,000+), which makes it faster to audit and faster in practice. Speeds are typically 2 to 5 times higher than OpenVPN on the same connection. Battery impact on mobile is lower. Downsides: slightly less mature than OpenVPN, some network environments block it. Best choice for most users today.
OpenVPN
OpenVPN is the most established VPN protocol: highly configurable, runs over TCP (useful for bypassing strict firewalls) or UDP, and has a 20-year track record. Slower than WireGuard, higher battery consumption, but extremely reliable and well-audited. Best choice for: users who need to bypass restrictive network environments (hotel firewalls, corporate networks), and users who need the highest-trust audited protocol for sensitive use cases.
IKEv2/IPSec
IKEv2 is fast, stable, and re-connects quickly after network changes (ideal for mobile users switching between WiFi and cellular). It is natively supported on iOS and macOS, which makes it battery-efficient on Apple devices. Moderate security auditing. Best choice for: mobile users on Apple devices, users who frequently switch networks.