You walk into the hotel. You’re tired. You connect to “Hotel_Guest” without thinking about it, because that’s what everyone does. The connection goes through. Email loads. You move on with your day.
Here’s what you didn’t see: the second you joined that network, you were placed on the same shared connection as every other person on it. The guest two floors up. The person sitting in the lobby who doesn’t have a room. Whatever device someone left running in 412. On a public network, you are not behind a wall. You are in an open field with strangers, and you can’t see a single one of them.
That’s the problem Citadel exists to solve. Not fear — visibility. Secure the perimeter.
You connect blind. That’s the whole risk.
The danger of public WiFi isn’t that it’s unusable. It’s that you join it with no idea what’s on it. You can’t see the other devices. You can’t see which ones are running services they shouldn’t. You can’t see the one machine that’s been left wide open. You’re trusting a network you know nothing about with your email, your banking, your work files.
Citadel gives you eyes. Connect to any network, tap scan, and in under 15 seconds you see the whole picture:
- Every device on the network — counted and mapped, not hidden.
- Open ports — including the dangerous ones that shouldn’t be exposed.
- SSH and remote-access tools — machines set up to be controlled from somewhere else.
- Unknown devices — anything you don’t recognize, flagged.
- Your overall risk level — one clear verdict: good, or get off.
Fifteen seconds. Then you know whether the field is empty or crowded.
See the threat, then disappear
Knowing a network is risky is step one. Step two is doing something about it. Citadel includes a built-in WireGuard VPN. One tap and your traffic drops into an encrypted tunnel secured with ChaCha20 — the modern cipher built for mobile, fast enough that you won’t feel it. When the tunnel is up, the network sees nothing. Not your email. Not your sites. Not you. The hotel, the airport, the café — they route your traffic and learn nothing from it.
Detection plus protection. See the perimeter, then secure it.
This isn’t only for “tech people”
We built Citadel for regular people who happen to live on untrusted networks:
- Travelers moving between hotel, airport, and lounge WiFi every week.
- Remote workers parked in a different café every day.
- Realtors logging into client paperwork from open networks between showings.
- Parents who want to know what’s actually on the WiFi their kids are using.
You don’t need to understand ports and protocols. Citadel does the understanding. You get a clear answer and a one-tap shield.
The numbers
Citadel has scanned over 500,000 networks. Every one of them taught the engine what normal looks like and what a threat looks like — which is why it can give you a verdict in seconds instead of a wall of data you’d have to decode yourself.
And the core scanner is free. Download it, connect to whatever network you’re on right now, and run a scan. You’ll see your own network in a way you never have before.
Do this the next time you connect
- Before you type anything sensitive, scan the network.
- If Citadel flags it, turn on the VPN before you do anything else.
- On a network you control and trust, mark your known devices so anything new stands out instantly.
Public WiFi isn’t going away, and you shouldn’t have to avoid it. You just shouldn’t walk into it blind. See the field. Secure the perimeter.
Defend yourself on public WiFi. Download Citadel free on the App Store and scan your first network in under 15 seconds. · citadelcyber.ai