Comparison

Flight Test X20 vs Alert Simulator

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

Head to head
About

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.

Highlights
  • 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.

About

Alert Simulator

Features
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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

Alert Simulator1 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 8 level
Flight Test X20 versus Alert Simulator: the parameters behind the verdict, then further details
ParameterFlight Test X20Alert Simulator
PriceFreeFree
Rating3.9 (93 ratings) — better—
Positive reviews60.0% of reviews—
Number of ratings93 — better—
Update frequencyEvery 5 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPadiPhone, iPad — better
Requires iOS14.0 — better18.0
Further details — not scored
Size25 MB4 MB
Age rating4+4+
DeveloperSheppard Air, Inc.Brice Rosenzweig

In-app purchases

None

Flight Test X20

No in-app purchases

None

Alert Simulator

No in-app purchases

Questions

Is Flight Test X20 free?
Flight Test X20 is free to download, with no in-app purchases.
Is Alert Simulator free?
Alert Simulator is free to download, with no in-app purchases.
Do Flight Test X20 or Alert Simulator have ads?
Neither Flight Test X20 nor Alert Simulator shows ads.
Which is updated more often, Flight Test X20 or Alert Simulator?
Flight Test X20 ships an update every 5 weeks, and Alert Simulator every 2 weeks. Most recently, Flight Test X20 was updated on October 16, 2026 and Alert Simulator on September 29, 2026.

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