ATPL Dictionary
by Lybron Sobers
- Reference
- Paid
- Zombie
- Small & simple · 90
- Rating
- 4.6
- 14 ratings · France storefront
- Last update
- May 13, 2020
- Version 5.0.7
- Size
- 2 MB
- Category
- Reference
- Tracked since
- Oct 9, 2026
Estimated revenue
A model estimate with a likely range, not a reported figure.
No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.
How this estimate is made
Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.
Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.
Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.
Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.
Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.
Full methodScreenshots
As shown on the App Store listing.
About this app
Text from the App Store listing.
ATPL Dictionary is a must-have aviation reference with more than 30,000 users worldwide, with over 1000 definitions and 900 abbreviations in the full version. If you're an aviation enthusiast or aviation curious, there's plenty here for you too. Definitions are based on subjects in the Airline Transport Pilot License syllabus, such as:
- Radio Navigation
- Meteorology
- Airframes
- Operational Procedures
- Human Performance and Limitations
- Mass & Balance
- Instrumentation
- Principles of Flight
- Aircraft Performance
- Flight Planning
- General Navigation
- Air Law
- VFR Communications
- IFR Communications
- iCloud sync: Sync your purchase across all your devices.
What’s new
Release notes for the latest version, as written by the developer.
New from version 5.0:
- rebuilt with support for modern devices
- support for Dark Mode in iOS 13
- bug fixes
Rank history
Daily position in the Anguilla charts. #1 is at the top.
- Best rank
- #8
- Current rank
- #8
- Days charting
- 7 of 7
On the charts today
Small & simple score
How realistic it is for a small team to build something like this.
90/100
Small & simple
- Developer size70% · 25
Developer: 2 apps on the charts
- Audience size100% · 20
Ratings: 14
- App size100% · 10
Size: 2 MB
- Price model100% · 15
Price model: paid
- Demand proof90% · 30
Best rank #8, 16 countries
An indicator, not a fact. We can't see team size. Calculated Oct 24, 2026 · method i2
How the score worksVersion history
- 5.0.7LatestReleased May 13, 2020