Park, hold your phone against the tag, done. Back at the station you walk straight to your bike. A nudge an hour before the free day ends and three days before the bike would go to the depot. No app to install, no account.
StallaUT-C-3-12You park in a hurry among thousands of bikes. Two days later you walk the rows. Or you took a photo of the sector sign while everyone squeezed past. Or you always park in the same spot, until it is taken. Meanwhile the free day runs out unnoticed, at €1.35 to €1.50 a day, or the bike gets a label and goes to the depot: Utrecht removed 30,528 bikes in 2024, fewer than half of them retrieved.
The rider knows where the bike is. Nobody else does. One tap when you park, straight to the bike when you come back. Stalla stores a rack code and a time against a random token, not a person, and the operator sees no one.
The tag on the rack opens a page that remembers where and when, also three floors underground without signal. NFC or QR, Android and iPhone. No account, no download.
Back at the station, open Stalla from the home screen or tap the Stalla sign at the entrance: the spot is on the plan, in the words of your signs. At the rack, tap the tag again and the spot is closed.
A reminder an hour before the free period ends and three days before the removal deadline, from the rules of your facility, in Dutch and English.
Each bike keeps its own spot. A spot can be shared with whoever picks the bike up.
Nothing you have to do. What you may notice:
Stalla never tells you, or anyone, who parked where.
Every rack segment carries a code. The tag opens stalla.nl/t/UT-C-3-12 and the phone saves the code and the time. The same URL is in the QR code.
Open Stalla, or tap the sign at the entrance. The plan lights the rack. At the rack, tap the tag once more to close the spot.
Free period, tariff, removal term: the reminder says what your facility says, when it matters.
The code is only an identifier: your place plus the words your signs already use. The app shows the commuter exactly what your signs say; we do not renumber anything.
UT-C-3-12 Utrecht Centraal, Stationsstalling: verdieping 3, vak C, rij 12
DT-18B Delft, stalling under the station square: rij 18b
RTD-B-0-2 Rotterdam Centraal, Stationsplein racks: vak B, rij 2Phones get no fix three floors underground, and at street level the error is bigger than a row. The tag is the location: no hardware, no power, no maintenance beyond re-sticking.
An NFC chip under laminated vinyl, the same URL as a QR code for phones without NFC, the code in plain text for people who would rather type.
We stick the tags on one floor; you keep doing what you do. After three months you know two things:
The tags are removable. Stop whenever you like.
Twenty minutes at your stalling. We bring twenty tags, stick one on the segment you choose, and you tap it with your own phone. No slide deck.
[email protected]
Replies within a working day.
Bartlomiej Dudek and Evren Ucar, co-founders, Delft.
No. The tag opens a web page that works like an app; the phone keeps a random token. For reminders they add it to the home screen once.
Yes. The tap is saved on the phone first and sent when there is signal again. The tag itself is the location; nothing depends on GPS.
Not without you. The pilot is done with the operator: you choose the segments, we place removable tags, and we take them off if you decide to stop.
A rack code, a time and a random device token. No name, no card number, no location history; deleted 30 days after pick-up. Neither Stalla nor the operator sees who parked where.