B737 Alerts vs Chart Guide Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
B737 Alerts
A comprehensive reference guide for Boeing 737 error messages, covering PFD/ND, FMC, and panel module issues. It provides detailed descriptions, corrective actions, and cross-links to procedures for pilots and maintenance personnel.
- Covers 737-600, -700, -800, -900, and BBJ series errors
- Details PFD/ND, FMC, and panel module errors
- Includes nearly 400 errors
- Cross-links annunciations to QRH procedures
- Provides error descriptions and corrective actions
- Classifies messages by system and ATA chapter
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B737 Alerts is a handy reference guide to the error messages produced by Boeing 737-600, -700, -800, -900, and BBJ series. Designed for professional pilots and maintenance personnel, B737 Alerts covers three types of errors: - Those from the PFD/ND (Next Generation only) - Those from the FMC - Those from the panel modules. In all, nearly four hundred errors are covered. Control head annunciations are cross-linked to QRH procedures as a handy study aid. As always, your FAA-Approved Flight Manual is the final authority as to the safe operation of your airplane, but this is a great training aid for those new in type, studying the systems, or facing a checkride. Each error has a link to a detailed description of the error as well as suggestions for immediate corrective action. Messages are also classified by system and ATA chapter, thus helping you focus on your FCOM or maintenance manual for additional research. B737 Alerts was developed by Bill Bulfer, a recently retired captain with a major airline with extensive time in type. Bill is also the author of the Cockpit Companion series and the FMC Guide, soon to be adapted for the iPad.
Chart Guide Pro
Learn to interpret aeronautical charts with this intuitive guide. It simplifies complex aviation mapping information for pilots and enthusiasts.
- Understand aeronautical charts
- Simplify aviation mapping
- Pilot-friendly interface
- Learn chart interpretation
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Chart Guide Pro is an easy way to understand how to use aeronautical charts
Screenshots
Verdict
The clearest difference is rating: B737 Alerts at 4.3 against Chart Guide Pro's 1.0. B737 Alerts also leads on update cadence (every 5 months vs every 21 months) and ratings volume (9 vs 1). Chart Guide Pro's advantage is price ($5.99 vs $9.99). On ads, in-app purchases, monetization model and device support 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
B737 Alerts costs $9.99 and Chart Guide Pro $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
B737 Alerts holds the better App Store score, 4.3 against 1.0. That said, the two scores are not equally well evidenced: B737 Alerts has 9 ratings behind it against 1, so its average is the more settled of the two.
B737 Alerts ships an update every 5 months, Chart Guide Pro every 21 months. The most recent releases landed on October 26, 2026 and October 7, 2026 respectively.
| Parameter | B737 Alerts | Chart Guide Pro |
|---|---|---|
| Price | $9.99 | $5.99 — better |
| Rating | 4.3 (9 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 37.5% of reviews | — |
| Number of ratings | 9 — better | 1 |
| Update frequency | Every 5 months — better | Every 21 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 54 MB | 21 MB |
| Age rating | 4+ | 17+ |
| Developer | fss.aero | Gadir Mamedov |
Customer experience
B737 Alerts
Chart Guide Pro
In-app purchases
B737 Alerts
No in-app purchases
Chart Guide Pro
No in-app purchases
