About this app
Ever had your Oyster or Contactless Payment Card rejected in London? Never be mystified by a ticket barrier error code again! Revealing the secret error codes at ticket barrier gates on the London Underground (Tube), Overground, DLR and National Rail. Just user the picker or type in the barrier code you received at the gate line into the App to reveal the secrets behind the numbers!
Latest release
What’s New
• minor fixes and improvements
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 15, 2026 · 1:12 PM $1.99
Screenshots
