# Oyster Errors vs Madrid Guide by Civitatis.com

The clearest difference is review sentiment: Madrid Guide by Civitatis.com at 67% against Oyster Errors's 0%. Madrid Guide by Civitatis.com also leads on price (Free vs $1.99). Oyster Errors's advantage is iOS requirement (9.3 vs 14.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Madrid Guide by Civitatis.com is free to download; Oyster Errors costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Oyster Errors ships an update every 4 months, Madrid Guide by Civitatis.com every 2 months. The most recent releases landed on October 4, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Oyster Errors | Madrid Guide by Civitatis.com |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[4.9 (43 ratings)](https://appshunter.io/ios/app/madrid-guide-by-civitatiscom/id1122008677/reviews)** |
| Number of ratings | — | **43** |
| Positive reviews | 0.0% of reviews | **66.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 5 MB | 103 MB |
| Requires iOS | **9.3** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Frostmd LLP](https://appshunter.io/developer/517289690) | [CIVITATIS TOURS S.L.](https://appshunter.io/developer/1199835690) |

## What reviewers say

### Oyster Errors

[App page](https://appshunter.io/ios/app/oyster-errors-london/id886704291)

Decode mysterious ticket barrier error codes encountered on London's public transport. This app helps you understand the meaning behind the numbers displayed at gates, so you're never confused again.

**Highlights:** 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

**Features:** Vision Pro support

**In-app purchases:** none


### Madrid Guide by Civitatis.com

[App page](https://appshunter.io/ios/app/madrid-guide-by-civitatiscom/id1122008677)

This free travel guide provides comprehensive information for planning a trip to Madrid. Discover attractions, dining options, accommodation advice, transport tips, and shopping recommendations. Includes a detailed map and options to book activities.

**Highlights:** General trip planning information, Detailed attraction details, Dining and accommodation recommendations, Transport and shopping advice, Interactive map of Madrid, Activity booking integration

**Features:** Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Oyster Errors free?

Oyster Errors costs $1.99, with no in-app purchases.

### Is Madrid Guide by Civitatis.com free?

Madrid Guide by Civitatis.com is free to download, with no in-app purchases.

### Do Oyster Errors or Madrid Guide by Civitatis.com have ads?

Neither Oyster Errors nor Madrid Guide by Civitatis.com shows ads.

### Which is updated more often, Oyster Errors or Madrid Guide by Civitatis.com?

Oyster Errors ships an update every 4 months, and Madrid Guide by Civitatis.com every 2 months. Most recently, Oyster Errors was updated on October 4, 2026 and Madrid Guide by Civitatis.com on October 12, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*