A room for every station.

A chat app tied to a place has three hard problems. It has to be sure you are really there, or the idea falls apart. It has to protect people who are talking to strangers, with no accounts to hold anyone accountable. And it has to feel alive at a quiet station at seven in the morning, when nobody else is in the room yet.

On top of that, the live train information had to be reliable and legal to use. Travellers trust departure times more than anything else on the screen, so a wrong platform would cost the app its credibility on day one.

We started with the rule that makes Perron different: presence is the product. Everyone joins a room as a reader, and earns the right to post by actually being within reach of the station. The check runs on our side, not in the app, so it cannot be switched off. The fence is deliberately generous, because station roofs scramble GPS and we would rather let in someone on the pavement than lock out a traveller on platform 5.

Next we solved the empty room. A traveller on their own needed a reason to open the app every trip, so we designed a collection around it: a passport of stamps graded by rarity, traveller ranks, daily streaks, collectible seals and, for subscribers, the train lines you have ridden. The rooms got small conversation starters too: platform questions anyone nearby can answer, and a "stuck here too" count when a train is delayed.

Train data comes from open, freely licensed public feeds rather than an operator's private service, which keeps Perron independent and on solid legal ground. Every important choice was written down with its reasoning, nineteen decision records in all, so the product can grow without forgetting why it is the way it is.