Sign-in page check
Asks the operating system whether this network is holding you at a captive sign-in page before it lets you online. On a phone it reads the platform's own flag; the laptop tool makes one plain web request to a public test address.
What it finds
- A network that is showing a sign-in page before it lets you online
What it cannot find
- Whether the sign-in page is the hotel's or a copy of it
- What the network does after you sign in
- A network that blocks the test address for another reason