# VRflow B737NG vs 737 Master Caution

The clearest difference is rating: 737 Master Caution at 4.4 against VRflow B737NG's 3.2. 737 Master Caution also leads on in-app purchases (none vs 1) and iOS requirement (13.0 vs 15.0). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. VRflow B737NG sells 1 in-app purchase, starting at $22.49 per month. 737 Master Caution asks for nothing beyond the download.

737 Master Caution holds the better App Store score, 4.4 against 3.2. Both are backed by a comparable volume of ratings — 6 and 7 respectively.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on September 30, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | VRflow B737NG | 737 Master Caution |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.2 (6 ratings)](https://appshunter.io/ios/app/vrflow-b737ng/id1619977611/reviews) | **[4.4 (7 ratings)](https://appshunter.io/ios/app/737-master-caution/id6455042070/reviews)** |
| Number of ratings | 6 | **7** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Freemium | **Free** |
| Size | 912 MB | 2 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [VRpilot ApS](https://appshunter.io/developer/1549637695) | [Studio BabDreams](https://appshunter.io/developer/431517875) |

## What reviewers say

### VRflow B737NG

[App page](https://appshunter.io/ios/app/vrflow-b737ng/id1619977611)

An interactive cockpit procedure trainer for the B737 NG, designed to enhance learning for type ratings, sim checks, and MCC courses. It offers detailed procedural training, system familiarization, and multi-crew simulation.

**Highlights:** Interactive cockpit procedure training, Normal procedures and memory items, Cockpit familiarization/Explore Mode, Multi-crew training with automatic crew member, Dynamic checklists and step-by-step explanations, Realistic aircraft systems and flight deck modeling

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| B737NG monthly subscription | $22.49 | per month |


### 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 VRflow B737NG free?

VRflow B737NG 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, VRflow B737NG or 737 Master Caution?

737 Master Caution is rated higher. VRflow B737NG averages 3.2 out of 5 from 6 ratings, while 737 Master Caution averages 4.4 from 7 ratings.

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

Neither VRflow B737NG nor 737 Master Caution shows ads.

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

VRflow B737NG ships an update every 3 months, and 737 Master Caution every 3 months. Most recently, VRflow B737NG was updated on September 30, 2026 and 737 Master Caution on October 15, 2026.

---

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