# 737 Handbook vs 737 Master Caution

The clearest difference is in-app purchases: 737 Master Caution at none against 737 Handbook's 2. 737 Master Caution also leads on iOS requirement (13.0 vs 16.4). 737 Handbook's advantage is rating (4.9 vs 4.4) and update cadence (every 3 weeks vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. 737 Handbook sells 2 in-app purchases, starting at $16.99 per 6 months. 737 Master Caution asks for nothing beyond the download.

737 Handbook holds the better App Store score, 4.9 against 4.4. That said, the two scores are not equally well evidenced: 737 Handbook has 247 ratings behind it against 7, so its average is the more settled of the two.

737 Handbook ships an update every 3 weeks, 737 Master Caution every 3 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 737 Handbook | 737 Master Caution |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (247 ratings)](https://appshunter.io/ios/app/737-handbook/id1482597031/reviews)** | [4.4 (7 ratings)](https://appshunter.io/ios/app/737-master-caution/id6455042070/reviews) |
| Number of ratings | **247** | 7 |
| Positive reviews | 87.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 51 MB | 2 MB |
| Requires iOS | 16.4 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [737 PUBLISHING S.R.O.](https://appshunter.io/developer/1496630252) | [Studio BabDreams](https://appshunter.io/developer/431517875) |

## What reviewers say

### 737 Handbook

[App page](https://appshunter.io/ios/app/737-handbook/id1482597031)

An interactive technical guide for pilots, offering quick reference for sim or interview preparation. Features interactive schematics, photos, videos, and a flight deck mock-up. Content is organized for flexible learning, from essential information to in-depth system exploration.

**Highlights:** Interactive schematics, Videos of malfunctions and systems, FMC simulator with CPDLC/ACARS, 737 Flight Deck Mock-up, Photo galleries, Offline content access

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Type Rating Pass (6-monthly) | $16.99 | per 6 months |
| Career Pass (Lifetime) | $54.99 | one-time |

**What reviewers like**

- 👍 Very informative and well-presented
- 👍 Excellent for learning and reference
- 👍 Great diagrams and visuals
- 👍 Helpful for pilots and trainees
- 👍 Worth the investment/cost

**What reviewers complain about**

- 🐛 App doesn't work offline
- 🐛 Sensitive/unintuitive touch controls
- 🐛 Expensive for what it offers
- 🐛 Crashes frequently
- 🐛 Slow loading times/stuck at percentages

**Reported bugs**

- App doesn't work offline
- Stuck at loading percentages (e.g., 56%, 57%)
- Premium content not available after purchase
- App fails to start after updates
- App not working on iOS 12.5.5

**Requested features**

- Make app available offline
- Improve interactive component intuitiveness
- Develop app for other aircraft models (e.g., 777)
- Add feature to highlight words and make in-app notes
- Consider sales/discounts on the app


### 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 737 Handbook free?

737 Handbook 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, 737 Handbook or 737 Master Caution?

737 Handbook is rated higher. 737 Handbook averages 4.9 out of 5 from 247 ratings, while 737 Master Caution averages 4.4 from 7 ratings.

### Do 737 Handbook or 737 Master Caution have ads?

Neither 737 Handbook nor 737 Master Caution shows ads.

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

737 Handbook ships an update every 3 weeks, and 737 Master Caution every 3 months. Most recently, 737 Handbook was updated on October 26, 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.*