Comparison

B737 CDU vs 737 Master Caution

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

B737 CDU

This app simulates a Boeing 737 CDU, allowing users to explore its pages and enter data. It's designed for pilots preparing for flights or seeking a refresher on CDU operations. The tool offers touch screen navigation and access to FMC and ACARS pages.

Highlights
  • Simulates 737 CDU interface
  • Explore FMC and ACARS pages
  • Touch screen navigation
  • Data entry for CDU
  • Useful for pilot training
Features
Read full description

B737 CDU allows you to get familiar with 737 cdu and lets you explore contents of each page (A great tool for your chair flying!) It was primarily developed to help pilots preparing for operating experience flights (anyone wanting to expedite CDU set up process). However, B737 CDU can be a useful tool as a reminder for every 737 pilot out there (ex.Either you are coming back from a long vacation or simply curious what to expect to see on each page) Following features will be available: -Access to FMC and ACARS pages -Touch screen capability which allows you to move from one page to the other -Type and enter the data into CDU (no logic, just number and letters) Refer to introduction videos and screenshots to find out more about what this app can do! Disclaimer: * Buttons and inputs usually used for actual flights DO work, but some of FMC and ACARS page buttons won't work until next update. * Data being entered into CDU doesn't have any logic to it, meaning this app is simply a replica; doesn't work like actual CDU. Any inquries or comments regarding the app, please contact us at goappcs@gmail.com. Thanks for downloading. Preview video: https://www.youtube.com/watch?v=WC70v6FrlDY https://www.youtube.com/watch?v=_VB5BuvlmVQ

About

737 Master Caution

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
Read full description

This app references more than 200 warning lights and messages of the B737 Classic, NG and MAX families. You are a pilot preparing your initial 737 type rating training, or an aviation enthusiast, or a flight simulator fan. You should enjoy this app. - Warning lights are grouped by FCOM chapters. - You may filter warning lights by airplane family / generation (Classic, NG or MAX). - Full text search to find a specific light. - Add your personal notes for each light and use the app as a notebook. - Place a bookmark to specific warning lights. You will also find 4 other tools, as reference : - A complete list of abbreviations with more than 400 definitions. - Full explanation of more than 100 FMC messages. - Position of more than 500 circuit breakers, sorted by ATA codes or by panels. - List of all electrical buses and more than 500 associated services. A great tool during your initial type rating training or during a refresher later. For training purposes ONLY. Do not use in-flight. Should you spot any error or have any suggestion, feel free to contact : support@babdreams.com Enjoy.

Screenshots

737 Master Caution4 screens

Verdict

The call

The clearest difference is price: 737 Master Caution at Free against B737 CDU's $7.99. 737 Master Caution also leads on rating (4.4 vs 2.0) and device support (3 vs 1). B737 CDU's advantage is iOS requirement (8.0 vs 13.0). On update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

737 Master Caution is free to download; B737 CDU costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

737 Master Caution holds the better App Store score, 4.4 against 2.0. Both are backed by a comparable volume of ratings — 2 and 7 respectively.

UpkeepUpdate frequency

B737 CDU ships an update every 2 months, 737 Master Caution every 3 months. Both last shipped on October 15, 2026.

Scorecard6 real differences · 4 level
B737 CDU versus 737 Master Caution: the parameters behind the verdict, then further details
ParameterB737 CDU737 Master Caution
Price$7.99Free — better
Rating2.0 (2 ratings)4.4 (7 ratings) — better
Positive reviews42.9% of reviews—
Number of ratings27 — better
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPadiPhone, iPad, iPod — better
Requires iOS8.0 — better13.0
Further details — not scored
Size43 MB2 MB
Age rating4+4+
DeveloperKun-Woo GoStudio BabDreams

Customer experience

B737 CDU

All ratings2 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews7 reviews
Positive42.9%
Neutral0.0%
Negative57.1%

737 Master Caution

All ratings7 ratings
Positive85.7%
Neutral0.0%
Negative14.3%

In-app purchases

None

B737 CDU

No in-app purchases

None

737 Master Caution

No in-app purchases

Questions

Is B737 CDU free?
B737 CDU costs $7.99, 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, B737 CDU or 737 Master Caution?
737 Master Caution is rated higher. B737 CDU averages 2.0 out of 5 from 2 ratings, while 737 Master Caution averages 4.4 from 7 ratings.
Do B737 CDU or 737 Master Caution have ads?
Neither B737 CDU nor 737 Master Caution shows ads.
Which is updated more often, B737 CDU or 737 Master Caution?
B737 CDU ships an update every 2 months, and 737 Master Caution every 3 months. Most recently, B737 CDU was updated on October 15, 2026 and 737 Master Caution on October 15, 2026.

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