# GSD Drone Calculator vs PreFlight 107

The clearest difference is review sentiment: PreFlight 107 at 100% against GSD Drone Calculator's 0%. PreFlight 107 also leads on rating (4.6 vs 4.0) and ads (none vs shown). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. GSD Drone Calculator sells 3 in-app purchases, starting at $1.99 per month and PreFlight 107 sells 5 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

PreFlight 107 holds the better App Store score, 4.6 against 4.0. Both are backed by a comparable volume of ratings — 3 and 12 respectively. Written reviews point the same way: 0% of GSD Drone Calculator's written reviews are positive against 100% of PreFlight 107's.

GSD Drone Calculator ships an update monthly, PreFlight 107 every 10 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | GSD Drone Calculator | PreFlight 107 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (3 ratings)](https://appshunter.io/ios/app/gsd-drone-calculator/id6450757319/reviews) | **[4.6 (12 ratings)](https://appshunter.io/ios/app/preflight-107/id6760437132/reviews)** |
| Number of ratings | 3 | **12** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 10 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 2 MB | 83 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Akhromieiev](https://appshunter.io/developer/1223973006) | [David S. Mendez](https://appshunter.io/developer/1823249129) |

## What reviewers say

### 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 |


### PreFlight 107

[App page](https://appshunter.io/ios/app/preflight-107/id6760437132)

This app helps drone pilots plan flights and ensure FAA compliance. It provides real-time weather, airspace information, and hazard alerts. Generate official flight logs and mission briefings for safe and legal drone operations.

**Highlights:** Live LAANC authorization, Drone weather and airspace maps, AI risk assessment, Tamper-evident mission briefings, Part 107 compliance tools, Flight logging and hangar management, ADS-B traffic radar

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PreFlight 107 | $9.99 | per month |
| Pro+ Founder | $14.99 | per month |
| Pro+ Monthly | $19.99 | per month |
| Yearly Pro) | $79.99 | per year |
| preflight107_19999_1y | $199.99 | per year |


## Frequently asked questions

### Is GSD Drone Calculator free?

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

### Is PreFlight 107 free?

PreFlight 107 is free to download, with in-app purchases available.

### Which has better reviews, GSD Drone Calculator or PreFlight 107?

PreFlight 107 is rated higher. GSD Drone Calculator averages 4.0 out of 5 from 3 ratings, while PreFlight 107 averages 4.6 from 12 ratings.

### Do GSD Drone Calculator or PreFlight 107 have ads?

GSD Drone Calculator shows ads; PreFlight 107 does not.

### Which is updated more often, GSD Drone Calculator or PreFlight 107?

GSD Drone Calculator ships an update monthly, and PreFlight 107 every 10 days. Most recently, GSD Drone Calculator was updated on November 3, 2026 and PreFlight 107 on October 31, 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.*