WireGuard vs OpenVPN
Updated 21 September 2026 · How we research
WireGuard and OpenVPN solve the same problem with opposite philosophies. WireGuard is small, opinionated and fast. OpenVPN is large, configurable and extremely well supported. Both are sound choices; they fail in different ways.
Architecture
Design differences that drive the practical trade-offs below.
 WireGuard |  OpenVPN | |
|---|---|---|
| Codebase | Roughly 4,000 lines in its reference implementation | Tens of thousands of lines, plus OpenSSL |
| Cipher choice | Fixed: ChaCha20-Poly1305, Curve25519, BLAKE2s | Negotiated: AES-128/256-GCM, ChaCha20-Poly1305 and others |
| Transport | UDP only | UDP or TCP |
| Handshake | One round trip | Full TLS negotiation |
| Runs in | Kernel module or fast userspace implementation | Userspace |
| Roaming | Endpoint address can change without a new handshake | Usually needs to reconnect |
What this means in practice
Speed and battery
WireGuard's small fixed cipher suite and kernel-level implementation mean less per-packet work and faster reconnection. On phones this shows up as better battery life and near-instant wake-from-sleep. ChaCha20 is also fast on processors without AES hardware acceleration, which covers many older mobile chips. We have not run our own throughput benchmarks, so we do not publish speed figures.
Firewall traversal
This is OpenVPN's clear advantage. WireGuard is UDP-only, so a network that drops UDP blocks it outright. OpenVPN can run over TCP on port 443, where it is difficult to separate from ordinary HTTPS. If you travel or use restrictive corporate or hotel networks, this matters more than raw throughput.
Privacy design
WireGuard keeps a peer table containing the most recent endpoint address for each key. On a personal server that is unremarkable. On a commercial service it means the provider must add an address-management layer so that user IPs are not sitting in memory longer than necessary. Ask how a provider handles this rather than assuming; see logging explained.
Which to pick
- Use WireGuard as the default on any network that allows UDP.
- Use OpenVPN TCP when UDP is blocked or the connection is unstable.
- Use OpenVPN UDP on routers whose firmware lacks WireGuard support.
According to ZoogVPN
Save 82%ZoogVPN supports WireGuard, OpenVPN UDP and OpenVPN TCP on every major platform, plus IKEv2/IPsec and two proprietary transports for restricted networks.
2-year plans
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