# Eos Tools Pro vs GPS Diagnostic

The clearest difference is price: Eos Tools Pro at Free against GPS Diagnostic's $2.99. Eos Tools Pro also leads on in-app purchases (none vs 1). GPS Diagnostic's advantage is review sentiment (78% vs 38%) and ratings volume (553 vs 9). On rating, ads and device support there is nothing between them.

Eos Tools Pro is free to download; GPS Diagnostic costs $2.99 up front. GPS Diagnostic sells 1 one-off in-app purchase. Eos Tools Pro asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for Eos Tools Pro against 4.7 for GPS Diagnostic. That said, the two scores are not equally well evidenced: GPS Diagnostic has 553 ratings behind it against 9, so its average is the more settled of the two. Written reviews are what separate them: 38% of Eos Tools Pro's written reviews are positive against 78% of GPS Diagnostic's.

Eos Tools Pro ships an update every 2 months, GPS Diagnostic every 3 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | Eos Tools Pro | GPS Diagnostic |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [4.6 (9 ratings)](https://appshunter.io/ios/app/eos-tools-pro/id961459993/reviews) | **[4.7 (553 ratings)](https://appshunter.io/ios/app/gps-diagnostic-satellite-test/id1020967894/reviews)** |
| Number of ratings | 9 | **553** |
| Positive reviews | 37.5% of reviews | **78.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | — | **#30** |
| Size | 36 MB | 34 MB |
| Requires iOS | 17.0 | **8.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Eos Positioning Systems](https://appshunter.io/developer/945012224) | [David Ryall](https://appshunter.io/developer/925576172) |

## What reviewers say

### Eos Tools Pro

[App page](https://appshunter.io/ios/app/eos-tools-pro/id961459993)

This utility app provides advanced GNSS information for high-precision receivers, crucial for GIS and surveying. It includes an NTRIP client for corrections, user-configurable alarms, and background operation with mapping software.

**Highlights:** Advanced GNSS information (RMS, PDOP, differential status), Built-in NTRIP client for RTK/DGNSS corrections, User-configurable audible alarms, Background operation with mapping software, Satellite view for multiple constellations, Orthometric Height and Position Shift computation

**Features:** Vision Pro support

**In-app purchases:** none


### GPS Diagnostic

[App page](https://appshunter.io/ios/app/gps-diagnostic-satellite-test/id1020967894)

**Currently charting:** #30 Top Paid · Navigation (US App Store)

This app tests your device's GPS module, providing precise navigation parameters and diagnosing location issues. It supports multiple satellite systems and offers advanced coordinate conversions through an in-app purchase.

**Highlights:** Test GPS module, Fast GPS lock time, Precise navigation parameters, GPS "JumpStart" technology, Full satellite system support, Additional coordinate systems (IAP)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coordinates-Pro | Free | one-time |

**What reviewers like**

- 👍 Helpful diagnostic tool
- 🚀 Provides detailed GPS information
- 🔧 Useful for troubleshooting GPS issues
- 💡 Allows resetting GPS receiver
- 👍 Clean and intuitive interface

**What reviewers complain about**

- 🐛 Compatibility issues with newer iOS versions
- 🔍 Limited satellite data display (only 4 bars)
- 📝 Email support button not working
- 🔍 Lacks detailed information on satellite types

**Reported bugs**

- Crashes on startup for some users
- Fails to detect GPS signal on certain devices

**Requested features**

- Display number of satellites in view and locked
- Expand satellite signal strength graph to show more satellites
- Add support for landscape mode
- Provide more detailed GPS information (e.g., HDOP, VDOP)


## Frequently asked questions

### Is Eos Tools Pro free?

Eos Tools Pro is free to download, with no in-app purchases.

### Is GPS Diagnostic free?

GPS Diagnostic costs $2.99, and also offers in-app purchases.

### Which has better reviews, Eos Tools Pro or GPS Diagnostic?

GPS Diagnostic is rated higher. Eos Tools Pro averages 4.6 out of 5 from 9 ratings, while GPS Diagnostic averages 4.7 from 553 ratings.

### Do Eos Tools Pro or GPS Diagnostic have ads?

Neither Eos Tools Pro nor GPS Diagnostic shows ads.

### Which is updated more often, Eos Tools Pro or GPS Diagnostic?

Eos Tools Pro ships an update every 2 months, and GPS Diagnostic every 3 weeks. Most recently, Eos Tools Pro was updated on October 24, 2026 and GPS Diagnostic on October 24, 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.*