# Pilot vs Quad Defects

The clearest difference is in-app purchases: Quad Defects at none against Pilot's 1. Quad Defects also leads on update cadence (daily vs every 31 months) and iOS requirement (12.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Pilot sells 1 in-app purchase, starting at $4.99 per year. Quad Defects asks for nothing beyond the download.

Pilot ships an update every 31 months, Quad Defects daily. The most recent releases landed on October 11, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Pilot | Quad Defects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/pilot-abbr/id1514884438/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 31 months | **Daily** |
| Monetization | Subscription | — |
| Size | 10 MB | 32 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Pedro Jose Villarroel Cuevas](https://appshunter.io/developer/558476272) | [Autosys Industrial Solutions Private Limited](https://appshunter.io/developer/1703269777) |

## What reviewers say

### Pilot

[App page](https://appshunter.io/ios/app/pilot-abbr/id1514884438)

This reference app provides flight crews with fast, offline access to over 14,000 aviation abbreviations and acronyms. It includes organized lists for general terms, datalink messages, airports, aircraft registrations, and airlines, drawing from numerous international sources.

**Highlights:** Offline access to 14,000+ aviation abbreviations, Organized lists: general, CPDLC, airports, registrations, airlines, Covers FAA, NOTAM, EASA, Jeppesen, and more, Fast and intuitive search functionality, Created by a pilot for pilots, Optimized for flight planning and in-flight reference

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PilotAbbr Subscription | $4.99 | per year |


### Quad Defects

[App page](https://appshunter.io/ios/app/quad-defects/id6748558117)

**In-app purchases:** none


## Frequently asked questions

### Is Pilot free?

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

### Is Quad Defects free?

Quad Defects is free to download, with no in-app purchases.

### Do Pilot or Quad Defects have ads?

Neither Pilot nor Quad Defects shows ads.

### Which is updated more often, Pilot or Quad Defects?

Pilot ships an update every 31 months, and Quad Defects daily. Most recently, Pilot was updated on October 11, 2026 and Quad Defects on October 16, 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.*