From strangers to regulars: turning guest Wi-Fi into a customer base

Most offline businesses have the same blind spot: a steady flow of people walks in, buys something and leaves — and not one of them ends up in a system you can talk to later. Guest Wi-Fi quietly fixes that.

The setup

A five-location coffee chain put a branded captive portal in front of its guest network. To get online, a visitor enters an email and ticks a clear consent box. That's the whole ask — one field — and it runs through a GDPR-compliant flow.

What changed

• Every visit now lands on a single customer profile, with frequency and recency.
• First-time visitors get a welcome message; lapsed regulars get a win-back.
• Campaigns are measured against real return visits, not just email opens.

Within three months the chain had a consented base in the thousands and a measurable lift in return rate — built entirely from traffic it was already getting.