Flight Test X20 vs Alert Simulator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Flight Test X20
Prepare for FAA knowledge tests with this comprehensive study platform. It offers top-off preparation for various pilot and aviation professional written exams, including instrument rating and ATP.
- FAA knowledge test preparation
- Pilot study course
- Dispatcher study course
- Instrument rating preparation
- Instructor written test prep
- ATP written test prep
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Flight Test X20 is Sheppard Air's latest student study course learning platform for FAA knowledge tests. It allows those students studying for pilot, dispatcher, instrument rating, instructor, flight engineer, ATP, and interviewee written tests to do their top-off preparation for the final knowledge test.
Alert Simulator
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This app generates simulated alerts that could happen in a plane during cruise for pilot training. You can use the app in two ways: You can generate a random simulated alert at any time by pressing the Run One Now button. If you enable notifications, you can select a duration for cruise and frequency, press start flight and receive the notification in the background while doing other tasks, for example on your electronic flight bag. If you didn't enable notification you will just receive one simulated alert immediately. If you receive an simulated alert via a notification, you can click on it to see its detail on the app. The simulated alert can be either a situation, like an engine failure or a crew alerting message on your avionics, and you should determine and review all the steps required to handle the situation, identify and run checklists, information in pilot handbook, review the actions you should take. It relies on a predetermined database of alerts corresponding to the plane you select. Currently only two planes are available. The goal is for you to regularly go through the motion required for managing alert, so should a real alert happens it will be automatic. This app is open source on GitHub.
Screenshots
Verdict
The clearest difference is update cadence: Alert Simulator at every 2 weeks against Flight Test X20's every 5 weeks. Flight Test X20's advantage is iOS requirement (14.0 vs 18.0). On price, ads, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Flight Test X20 ships an update every 5 weeks, Alert Simulator every 2 weeks. The most recent releases landed on October 16, 2026 and September 29, 2026 respectively.
| Parameter | Flight Test X20 | Alert Simulator |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (93 ratings) — better | — |
| Positive reviews | 60.0% of reviews | — |
| Number of ratings | 93 — better | — |
| Update frequency | Every 5 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPad | iPhone, iPad — better |
| Requires iOS | 14.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 25 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Sheppard Air, Inc. | Brice Rosenzweig |
In-app purchases
Flight Test X20
No in-app purchases
Alert Simulator
No in-app purchases
Questions
Is Flight Test X20 free?
Is Alert Simulator free?
Do Flight Test X20 or Alert Simulator have ads?
Which is updated more often, Flight Test X20 or Alert Simulator?
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