Comparison

WireGuard vs OpenVPN

One is about 4,000 lines of code. The other is well past 600,000. That single difference explains almost every other difference between them — including the one problem WireGuard creates for a no-logs VPN.

See our protocol stack

Speed Auditability Blocking resistance

At a glance

The short version

	WireGuard	OpenVPN
Codebase	~4,000 lines	~600,000 lines
Released	2016	2001
Typical speed	Faster	Slower
Connection time	Under a second	Several seconds
Roaming between networks	Seamless	Reconnects
Battery use on mobile	Lower	Higher
Runs over TCP port 443	No	Yes
Resists DPI blocking	Weaker	Stronger
Cryptographic agility	Fixed suite	Configurable

Why the size matters

Small code is a security argument

OpenVPN has been in production since 2001 and it shows. It supports a wide range of ciphers, both TCP and UDP, certificate schemes, plugins and configuration options accumulated over two decades. Every one of those is a feature somebody needs, and every one is also surface area that has to be reviewed.

WireGuard took the opposite decision. It ships one cipher suite — ChaCha20, Poly1305, Curve25519, BLAKE2s — with no negotiation. You cannot configure it badly because there is almost nothing to configure. At roughly 4,000 lines, a competent reviewer can read the entire implementation in an afternoon, which is not a realistic claim for OpenVPN.

Fewer options is also a cost. If a weakness is ever found in WireGuard’s fixed suite, there is no negotiating your way around it — the protocol has to be revised and everyone has to update. OpenVPN would simply be reconfigured to a different cipher.

The part most comparisons skip: WireGuard was designed for point-to-point links, not for commercial VPNs, and it keeps a static mapping of your public key to an assigned internal IP address on the server for as long as the session and a timeout window last. Left untouched, that is a record of who was connected and when — exactly the thing a no-logs provider says it does not keep. Serious providers solve it with in-memory-only allocation, frequent key rotation and double-NAT so that the mapping is never written to disk and never uniquely identifies a subscriber. Any provider offering WireGuard should be able to explain how they handle it.

Choosing

Which one should you use?

Pick WireGuard for speed

Streaming, large downloads, video calls and anything on a phone. It connects almost instantly, survives moving from Wi-Fi to mobile data without dropping, and uses noticeably less battery — which is the single biggest reason mobile VPN apps default to it.

Pick OpenVPN to get through

On a network that blocks VPNs, OpenVPN over TCP port 443 is far harder to distinguish from ordinary HTTPS traffic. WireGuard is UDP-only with a distinctive handshake, which makes it comparatively easy for inspection equipment to spot and drop.

Pick OpenVPN for control

Enterprise deployments that need specific ciphers, certificate infrastructure, or compatibility with hardware and operating systems too old to have WireGuard support. Its age is the reason it runs on nearly everything.

Or let the app decide

In practice most people should not be choosing manually. A good client uses WireGuard by default and falls back automatically when the network refuses it. LunoGuard is our WireGuard-based tunnel, with obfuscation available when a network is hostile — see our technology page.

Speed

How much faster is WireGuard, really?

On a fast connection with a nearby server, both protocols will usually saturate whatever your line can do, and you will not be able to tell them apart. The gap opens up in the conditions where VPNs are actually inconvenient: distant servers, congested mobile networks, and modest hardware such as a router or an older phone.

WireGuard’s advantage comes from running in kernel space with a much shorter code path per packet, which means less CPU per megabyte. On a phone that shows up as battery life; on a router it shows up as throughput the device could not otherwise reach.

Reconnection is the difference people notice most. WireGuard is stateless in a way that lets a session survive a change of network entirely — walk out of the house, move from Wi-Fi to 5G, and the tunnel continues. OpenVPN renegotiates, which takes seconds and drops whatever was in flight.

FAQ

Common questions

Is WireGuard more secure than OpenVPN?

Both are considered secure when correctly implemented, and neither has a known practical break. WireGuard’s advantage is reviewability — 4,000 lines against roughly 600,000 means far less code to audit and far less room for implementation mistakes. OpenVPN’s advantage is two decades of scrutiny and the flexibility to change cipher if one is ever weakened.

Is WireGuard bad for privacy?

Not inherently, but it needs work from the provider. The protocol keeps a mapping between your public key and an assigned internal IP for the session, which on its own would be a connection record. Providers solve this with in-memory-only allocation, key rotation and double-NAT. Ask any provider how they handle it; a good one will have a published answer.

Which protocol is better for streaming?

WireGuard, in almost all cases. Higher throughput and lower latency mean less buffering, and near-instant reconnection matters when you switch networks mid-episode. The exception is a network that blocks WireGuard outright, where OpenVPN over TCP 443 will connect when WireGuard cannot.

Why do some networks block WireGuard but not OpenVPN?

WireGuard runs only over UDP and has a distinctive, fixed handshake, which makes it straightforward for deep packet inspection to fingerprint. OpenVPN can run over TCP on port 443, where it closely resembles ordinary HTTPS. That is why obfuscation exists — it reshapes the traffic so neither is recognisable.

Should I use IKEv2 instead?

IKEv2 sits between the two: fast, excellent at surviving network changes, and natively supported on iOS and Windows without extra software. It is also easy to block, since it uses fixed UDP ports. See our OpenVPN vs IKEv2 comparison.

We run WireGuard, carefully

LunoGuard is built on WireGuard, with in-memory key allocation and obfuscation for networks that would rather you didn’t. The implementation is public.

Get LunoVPN Read the code