Underpass
Home & personal

Your home computers.
From anywhere.

Reach your files, photos, media server or smart home from your laptop, wherever you are. Nothing is opened on your router, and it's free for up to 3 people and 25 devices.

acme · home

Good evening. Everything at home is reachable.

Smart homehomeassistant
Moviesmedia-box
Photosnas
Filesnas
Ad blockerpi
+Add a device

Connected to nas

From café Wi-Fi, straight to your home. Nothing opened on your router.

Before and after

No port forwarding.
No router settings at all.

Your home devices stay closed to the internet. Only your own devices can reach them.

The usual way

anyonelaptopcaféInternetanyonerouterport 8123 openhomeassistanthome
  1. 01Your home app open to the whole internet
  2. 02A dynamic DNS name that breaks
  3. 03Stuck behind a shared address

With a private network

directlaptopcaféInternetnothing openrouterno ports openhomeassistanthome
  1. 01Nothing opened on your router
  2. 02Every device by name
  3. 03Works on any home internet
Set up

Set it up
in an evening. Or less.

Install it on the computer at home and on your laptop. That's it.

  1. 1

    Install it at home

    On the computer that has your files or apps: a Windows PC, or Linux, including a Raspberry Pi or a home server.

    MachinesHome

    nas

    Linux · Raspberry Pi

    Online

    media-box

    Windows 11

    Online
  2. 2

    Install it on your laptop

    Sign in with the same account. Your home devices show up in your network right away.

    Underpasslaptop
    Connected

    nas

    100.64.0.9

    media-box

    100.64.0.15
  3. 3

    Open them by name

    From a café, a hotel or a friend's place, open your home apps by name, as if you were home.

    homeassistant:8123from café Wi-Fi

    Living room

    Lights on

    Thermostat

    21.5°

    Front door

    Locked

    Garage

    Closed

What you get

Everything you need.
Free.

The Free plan has every feature. It's limited only in size: 3 people and 25 devices.

FAQ

Questions about home use.

Something we didn't cover? Write to us and we'll help you get set up.

Ask us anything
  • Yes. Free covers up to 3 people and 25 devices with every feature. You only pay if you grow past that.

Other use cases

/ 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.