# F3A Zone Pro vs GSD Drone Calculator

The clearest difference is price: GSD Drone Calculator at Free against F3A Zone Pro's $0.99. F3A Zone Pro's advantage is in-app purchases (none vs 3) and ads (none vs shown). On update cadence and device support there is nothing between them.

GSD Drone Calculator is free to download; F3A Zone Pro costs $0.99 up front. GSD Drone Calculator sells 3 in-app purchases, starting at $1.99 per month. F3A Zone Pro asks for nothing beyond the download.

F3A Zone Pro ships an update every 2 months, GSD Drone Calculator monthly. The most recent releases landed on September 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | F3A Zone Pro | GSD Drone Calculator |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[4.0 (3 ratings)](https://appshunter.io/ios/app/gsd-drone-calculator/id6450757319/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | — | Free with in-app purchases |
| Size | 2 MB | 2 MB |
| Requires iOS | **14.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Andrew Palmer](https://appshunter.io/developer/1233982492) | [Roman Akhromieiev](https://appshunter.io/developer/1223973006) |

## What reviewers say

### F3A Zone Pro

[App page](https://appshunter.io/ios/app/f3a-zone-pro/id1286921960)

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

**In-app purchases:** none


### GSD Drone Calculator

[App page](https://appshunter.io/ios/app/gsd-drone-calculator/id6450757319)

Calculate Ground Sample Distance (GSD) for drone missions with this intuitive tool. Input drone specs and camera details to get precise GSD values for optimal mapping, surveying, and photography. Streamline your data collection and enhance accuracy for all aerial endeavors.

**Highlights:** Accurate GSD calculations, Input drone and camera specifications, Real-time GSD values, Optimize flight planning, Intuitive user interface, Save calculations, Image resolution insights

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Month | $1.99 | per month |
| Annual | $19.99 | per year |
| Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is F3A Zone Pro free?

F3A Zone Pro costs $0.99, with no in-app purchases.

### Is GSD Drone Calculator free?

GSD Drone Calculator is free to download, with in-app purchases available.

### Do F3A Zone Pro or GSD Drone Calculator have ads?

GSD Drone Calculator shows ads; F3A Zone Pro does not.

### Which is updated more often, F3A Zone Pro or GSD Drone Calculator?

F3A Zone Pro ships an update every 2 months, and GSD Drone Calculator monthly. Most recently, F3A Zone Pro was updated on September 25, 2026 and GSD Drone Calculator on October 24, 2026.

---

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