Sign in. Add your devices.
They find each other.
No network settings to change and nothing to configure by hand. Here's what happens, step by step and behind the scenes.
Three steps.
No setup headaches.
No network settings to change and nothing to configure by hand. Your first two devices can be talking to each other in a few minutes.
Sign in
Create your network with your Google account or a code we email you. No special hardware needed.
office-pc wants to join
Windows 11 · Acme network
Approve each device
Install the app on your Windows or Linux computers, then approve each one from your browser.
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Connect by name
Every device gets its own simple name. Reach it from anywhere, as if it were on your desk.
What actually happens.
In plain words.
Our service only introduces your devices. After that, they talk to each other directly.
01
We introduce your devices
Each device tells our service its public key and how it can be reached. The service passes that on to the other devices in your network, and nothing else.
02
They connect straight to each other
Devices open an encrypted WireGuard connection directly to each other, through home routers and most firewalls.
03
A relay, only when needed
If a network blocks a direct path, an encrypted relay passes the data along. It can't read it, and it keeps trying to go direct.
Want the details? How devices find each other →
Less than you'd think.
Free to start.
- An account: sign in with Google or a code by email
- Windows 10 or 11, or Linux (including Raspberry Pi)
- About a minute per device
- No router changes, no open ports
Questions about how it works.
Something we didn't cover? Write to us and we'll help you get set up.
Ask us anythingNo. Our service only introduces your devices to each other. Your data goes directly between them, or through an encrypted relay that can't read it.
/ Independent · bootstrapped · no investors
Built by a person,
not a fund.
I'm Endi, and I build Underpass myself. No investors to answer to, only the people who run their networks on it. Every message that comes in reaches me directly.