# A220 Guide vs 737 Master Caution

The clearest difference is rating: 737 Master Caution at 4.4 against A220 Guide's 2.0. 737 Master Caution also leads on in-app purchases (none vs 1) and ads (none vs shown). A220 Guide's advantage is update cadence (every 2 weeks vs every 3 months). On price and device support there is nothing between them.

Both are free to download. A220 Guide sells 1 in-app purchase, starting at $12.99 per 6 months. 737 Master Caution asks for nothing beyond the download.

737 Master Caution holds the better App Store score, 4.4 against 2.0. That said, the two scores are not equally well evidenced: 737 Master Caution has 7 ratings behind it against 1, so its average is the more settled of the two.

A220 Guide ships an update every 2 weeks, 737 Master Caution every 3 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | A220 Guide | 737 Master Caution |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/a220-guide/id6449822839/reviews) | **[4.4 (7 ratings)](https://appshunter.io/ios/app/737-master-caution/id6455042070/reviews)** |
| Number of ratings | 1 | **7** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 50 MB | 2 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Onboard By JCG Ltd](https://appshunter.io/developer/1690753784) | [Studio BabDreams](https://appshunter.io/developer/431517875) |

## What reviewers say

### A220 Guide

[App page](https://appshunter.io/ios/app/a220-guide/id6449822839)

This app provides pilots with essential operational information for the A220 aircraft. It features 14 in-depth chapters, EICAS message alerts, and a powerful search function. Enhance your understanding with detailed schematics, photos, and illustrations.

**Highlights:** 14 in-depth operational chapters, EICAS message alerts, Effortless search functionality, Detailed schematics and illustrations, High-quality photographs, Premium access unlockable via in-app purchase

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access Starter (6 Months) | $12.99 | per 6 months |


### 737 Master Caution

[App page](https://appshunter.io/ios/app/737-master-caution/id6455042070)

This app provides a comprehensive reference for over 200 warning lights and messages across B737 Classic, NG, and MAX aircraft families. It includes tools for abbreviations, FMC messages, circuit breakers, and electrical buses, aiding pilot training and aviation enthusiasts.

**Highlights:** References over 200 B737 warning lights and messages, Filter by aircraft family (Classic, NG, MAX), Full text search for specific lights, Personal notes and bookmarking, Reference tools for abbreviations, FMC messages, circuit breakers, and electrical buses

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is A220 Guide free?

A220 Guide is free to download, with in-app purchases available.

### Is 737 Master Caution free?

737 Master Caution is free to download, with no in-app purchases.

### Which has better reviews, A220 Guide or 737 Master Caution?

737 Master Caution is rated higher. A220 Guide averages 2.0 out of 5 from 1 ratings, while 737 Master Caution averages 4.4 from 7 ratings.

### Do A220 Guide or 737 Master Caution have ads?

A220 Guide shows ads; 737 Master Caution does not.

### Which is updated more often, A220 Guide or 737 Master Caution?

A220 Guide ships an update every 2 weeks, and 737 Master Caution every 3 months. Most recently, A220 Guide was updated on October 24, 2026 and 737 Master Caution on October 24, 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.*