# Airliners Encyclopedia vs ADP

The clearest difference is price: Airliners Encyclopedia at Free against ADP's $10.99. Airliners Encyclopedia also leads on review sentiment (44% vs 0%) and rating (4.1 vs 1.0). ADP's advantage is in-app purchases (none vs 3) and iOS requirement (12.0 vs 15.0). On ads and device support there is nothing between them.

Airliners Encyclopedia is free to download; ADP costs $10.99 up front. Airliners Encyclopedia sells 3 in-app purchases, starting at $2.99 per month. ADP asks for nothing beyond the download.

Airliners Encyclopedia holds the better App Store score, 4.1 against 1.0. That said, the two scores are not equally well evidenced: Airliners Encyclopedia has 21 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 44% of Airliners Encyclopedia's written reviews are positive against 0% of ADP's.

Airliners Encyclopedia ships an update weekly, ADP every 39 months. The most recent releases landed on November 2, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Airliners Encyclopedia | ADP |
| --- | --- | --- |
| Price | **Free** | $10.99 |
| Rating | **[4.1 (21 ratings)](https://appshunter.io/ios/app/airliners-encyclopedia/id1036268445/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/adp-aviation-dictionary-prem/id1408981639/reviews) |
| Number of ratings | **21** | 1 |
| Positive reviews | **44.4% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 39 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 129 MB | 70 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Good Spider, LLC](https://appshunter.io/developer/1487595667) | [Raj Kumar](https://appshunter.io/developer/1037581682) |

## What reviewers say

### Airliners Encyclopedia

[App page](https://appshunter.io/ios/app/airliners-encyclopedia/id1036268445)

An extensive offline encyclopedia detailing airliners with thousands of articles and high-definition photos. It's designed for aviation enthusiasts and curious children alike, offering engaging content and a badge collection system for motivation.

**Highlights:** Thousands of articles and pictures, High-definition photos, Intuitive user interface, Offline availability, Badge collection system, A-Z topic coverage

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $2.99 | per month |
| Annual Premium | $19.99 | per year |
| Full Version | $9.99 | one-time |


### ADP

[App page](https://appshunter.io/ios/app/adp-aviation-dictionary-prem/id1408981639)

This comprehensive aviation dictionary provides quick reference for pilots, technicians, and engineers. It defines over 16,500 terms, abbreviations, and phrases with illustrations, and works offline.

**Highlights:** Offline access, 16,500+ aviation terms, 700+ illustrations, Word/Abbreviation searching, Bookmarking, Text-to-speech pronunciation, Word of the Day

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Airliners Encyclopedia free?

Airliners Encyclopedia is free to download, with in-app purchases available.

### Is ADP free?

ADP costs $10.99, with no in-app purchases.

### Which has better reviews, Airliners Encyclopedia or ADP?

Airliners Encyclopedia is rated higher. Airliners Encyclopedia averages 4.1 out of 5 from 21 ratings, while ADP averages 1.0 from 1 ratings.

### Do Airliners Encyclopedia or ADP have ads?

Neither Airliners Encyclopedia nor ADP shows ads.

### Which is updated more often, Airliners Encyclopedia or ADP?

Airliners Encyclopedia ships an update weekly, and ADP every 39 months. Most recently, Airliners Encyclopedia was updated on November 2, 2026 and ADP on November 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*