From a page of rules to a game beyond Android.

The original idea

“Can you build a page with the rules?”

The original game came from two friends: text a photo to someone and challenge them to grab a drink within 24 hours—or owe the other person a drink. They wanted a simple page so others could play too.

Bill proposed making the game into an app and built a PHP public website alongside an Android-only application. That first version ran for roughly a year or less before shutting down.

The idea stayed with him. The limitation he wanted to remove was clear: a friend’s choice of phone should not determine whether they could join.

Bringing it back

One conversation.
A prototype that night.

Years later, while stuck in traffic, Bill shared the BarTag story with ChatGPT and asked what it would take to rebuild it from the ground up. Technology had changed enough that a broader version felt possible.

Later that night, he had a working prototype. Over the next few months, he developed the gameplay, interface, and supporting systems, then published the rebuilt app on the original domain.

The prototype made the idea tangible. The months that followed turned it into a product people could use.

The experience

Build a story together.

A player opens a Round with a photo and a place, then tags someone in. As people join and submit their own Proofs, the Round becomes a shared record of real-world moments.

Participants can tag more friends into the same open Round. Signed-in players can add additional Proofs, and guests can join through private links. The experience supports a group rather than only a single back-and-forth exchange.

Today’s game is for adults 21 and over, with alcohol optional. A Proof records the moment; it does not require consuming or finishing a drink. The modern experience centers on voluntary participation and connection.

People, places & moments

Make the real world part of the app.

Place search and a player’s recent Places help connect each Proof to a venue. The TagMap lets visitors explore eligible activity from completed Rounds, while signed-in players can view their own activity.

Player dashboards bring together action items, personal history, and statistics. Email and browser notifications support the game’s timing, with account preferences for different types of updates.

Beyond the first prototype

Build the systems behind the game.

The rebuild separates the shared Round, the Tag sent to another player, and each participant’s Proof. That structure supports multiple players, repeated participation, deadlines, and a coherent story when a Round closes.

Active Rounds are private to authorized participants. Public views use selected completed activity, with controls around photo access and location disclosure. Completed Rounds have shareable summaries.

The work also includes administration tools, notification handling, photo processing, and repeatable testing. Those supporting systems are part of taking an early prototype through months of development into a launched application.