# iTrain B737NG vs 737 Master Caution

The clearest difference is price: 737 Master Caution at Free against iTrain B737NG's $17.99. 737 Master Caution also leads on iOS requirement (13.0 vs 18.0). iTrain B737NG's advantage is rating (4.9 vs 4.4) and update cadence (every 5 weeks vs every 3 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.

737 Master Caution is free to download; iTrain B737NG costs $17.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iTrain B737NG holds the better App Store score, 4.9 against 4.4. Both are backed by a comparable volume of ratings — 9 and 7 respectively.

iTrain B737NG ships an update every 5 weeks, 737 Master Caution every 3 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | iTrain B737NG | 737 Master Caution |
| --- | --- | --- |
| Price | $17.99 | **Free** |
| Rating | **[4.9 (9 ratings)](https://appshunter.io/ios/app/itrain-b737ng/id826303298/reviews)** | [4.4 (7 ratings)](https://appshunter.io/ios/app/737-master-caution/id6455042070/reviews) |
| Number of ratings | **9** | 7 |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Monetization | Paid | **Free** |
| Size | 14 MB | 2 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Flighttrainer Aviation Apps B.V.](https://appshunter.io/developer/1529841212) | [Studio BabDreams](https://appshunter.io/developer/431517875) |

## What reviewers say

### iTrain B737NG

[App page](https://appshunter.io/ios/app/itrain-b737ng/id826303298)

This app helps pilots master Boeing 737NG technical knowledge, memory items, and procedures. It offers a comprehensive question bank and focuses on efficient, distraction-free learning for type ratings, interviews, and recurrent training.

**Highlights:** B737NG Technical System Knowledge, NNC Memory Items, Flight Path Patterns & Maneuvers, 800+ Technical Questions, Distraction-Free Interface, Smart Database Updates

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 iTrain B737NG free?

iTrain B737NG costs $17.99, with no in-app purchases.

### Is 737 Master Caution free?

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

### Which has better reviews, iTrain B737NG or 737 Master Caution?

iTrain B737NG is rated higher. iTrain B737NG averages 4.9 out of 5 from 9 ratings, while 737 Master Caution averages 4.4 from 7 ratings.

### Do iTrain B737NG or 737 Master Caution have ads?

Neither iTrain B737NG nor 737 Master Caution shows ads.

### Which is updated more often, iTrain B737NG or 737 Master Caution?

iTrain B737NG ships an update every 5 weeks, and 737 Master Caution every 3 months. Most recently, iTrain B737NG 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.*