# Oyster Errors • London — Revealing secret error codes

> London transport ticket barrier error code decoder. (iPhone/iPad app by Frostmd LLP.)

- Source: https://appshunter.io/ios/app/oyster-errors-london/id886704291 (this page in markdown: same URL + `.md`)
- Developer: [Frostmd LLP](https://appshunter.io/developer/517289690)
- Category: Travel, Reference
- Price: $1.99
- Age rating: 4+
- Requires: iOS 9.3 · 5 MB
- Languages: American English
- Released: 2014-06-22
- Data updated: 2026-08-21
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/oyster-errors-london/id886704291/reviews.md

## What is Oyster Errors?

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!

## Key features

- Decode Oyster and Contactless card errors
- Understand ticket barrier error codes
- Covers London Underground, Overground, DLR, and National Rail
- Search by typing or using a picker
- Reveals secrets behind error numbers

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/oyster-errors-london/id886704291/reviews.md

### 1/5 — Needs work

*2017-01-10*

Lots of missing, inaccurate or odd information. The way to browse numbers is odd and there is no search functionality if I want to search a specific number. Fine for a free app, but charging for this? No. I will get a refund.

**Developer response:** The information in the App is complete as supplied by TfL. Not all of the codes are in use, which is why it seems as if there are gaps. You can tap the code in the top right to manually search for a code rather than using Apple’s picker. Hope this helps!

## Frequently asked questions about Oyster Errors

### What does Oyster Errors • London do?

Oyster Errors • London helps you understand the meaning behind ticket barrier error codes encountered on London's public transport network, including the Tube, Overground, DLR, and National Rail.

### How do I use Oyster Errors • London?

You can use the app's picker or type in the barrier code you received at the gate. The app will then reveal the secrets behind the numbers.

### What public transport does Oyster Errors • London cover?

It covers error codes for the London Underground (Tube), Overground, DLR, and National Rail services.

### Is Oyster Errors • London free?

No, Oyster Errors • London is a paid app, available for $1.99.

### What devices is Oyster Errors • London available on?

Oyster Errors • London is available on iPhone, iPad, and iPod devices.

### How often is Oyster Errors • London updated?

The app was last updated on June 27, 2025, with version 1.2.2. It was originally released on June 22, 2014.

### What is the age rating for Oyster Errors • London?

Oyster Errors • London has an age rating of 4+, making it suitable for a wide range of users.

### Does Oyster Errors • London have ads?

No, Oyster Errors • London does not contain advertisements.

## Version history (last 5 releases)

### 1.2.2 — 2025-06-27

• minor fixes and improvements

### 1.2.1 — 2022-03-29

• minor fixes and improvements

### 1.2.0 — 2021-04-08

• minor fixes and improvements

### 1.1.6 — 2021-03-11

• minor fixes and improvements

### 1.1.5 — 2021-03-08

• minor fixes and improvements

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## More apps by Frostmd LLP

- [Station Master](https://appshunter.io/ios/app/station-master/id517289687)
- [Tube Exits by Station Master](https://appshunter.io/ios/app/tube-exits-by-station-master/id886992678)
- [Disused Tube](https://appshunter.io/ios/app/disused-tube/id945456006)
- [Tram Master](https://appshunter.io/ios/app/tram-master/id1052839981)

All apps by Frostmd LLP: https://appshunter.io/developer/517289690

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-21.*