# Gemma GPS vs Tomstrails GPS UTM

The clearest difference is in-app purchases: Tomstrails GPS UTM at none against Gemma GPS's 2. Tomstrails GPS UTM also leads on ratings volume (1.6K vs 1). Gemma GPS's advantage is rating (5.0 vs 4.8) and device support (3 vs 1). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. Gemma GPS sells 2 in-app purchases, starting at $199.99 per year. Tomstrails GPS UTM asks for nothing beyond the download.

Gemma GPS holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Tomstrails GPS UTM has 1.6K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 86% of Gemma GPS's written reviews are positive against 84% of Tomstrails GPS UTM's.

Gemma GPS ships an update every 2 months, Tomstrails GPS UTM every 6 weeks. Both last shipped on November 1, 2026.

## The numbers

| Metric | Gemma GPS | Tomstrails GPS UTM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/gemma-gps/id731851553/reviews)** | [4.8 (1.6K ratings)](https://appshunter.io/ios/app/tomstrails-gps-utm/id1004370364/reviews) |
| Number of ratings | 1 | **1.6K** |
| Positive reviews | **85.7% of reviews** | 83.8% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 54 MB | 8 MB |
| Requires iOS | 18.0 | 18.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Patrick Tudor](https://appshunter.io/developer/731851556) | [Tomstrails.com](https://appshunter.io/developer/425642318) |

## What reviewers say

### Gemma GPS

[App page](https://appshunter.io/ios/app/gemma-gps/id731851553)

Navigate the outdoors with a digital compass that conserves battery. Save locations and get guided back to them with a simple arrow. Ideal for travelers, hikers, sailors, and geocachers who venture off the beaten path.

**Highlights:** Digital compass, Battery saving mode, Save locations, Night vision mode, Navigation guidance

**Features:** Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gemma GPS Pro Support | $199.99 | per year |
| Gemma GPS Enterprise Support | $499.99 | per year |


### Tomstrails GPS UTM

[App page](https://appshunter.io/ios/app/tomstrails-gps-utm/id1004370364)

This app provides precise UTM grid references and displays your location on topographic maps. It works offline, supports various regional datums, and offers multiple coordinate formats for easy sharing and use in other applications.

**Highlights:** Fast and accurate UTM grid reference, Locate position on topographic maps, Works without phone signal, Supports regional datums (e.g., ED50), Multiple coordinate formats (1m, 10m, 100m), Share coordinates with other apps, High contrast display for readability

**In-app purchases:** none

**What reviewers like**

- 🚀 Simple and free
- 👍 Works well
- 👍 Easy to use
- 👍 Accurate and reliable
- 👍 Great for hiking and emergencies

**What reviewers complain about**

- 🐛 Doesn't do anything
- 🐛 Coordinates not always accurate
- 💰 Requires payment for some features

**Reported bugs**

- Stopped working after iOS update
- UTM grids were off initially, required setting changes

**Requested features**

- Add support for Morocco coordinate system
- Add option to average readings and hold the result
- Add option to reduce coordinate display to 6 digits for emergency use
- Bring back previous features like degrees/minutes display and ability to edit messages


## Frequently asked questions

### Is Gemma GPS free?

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

### Is Tomstrails GPS UTM free?

Tomstrails GPS UTM is free to download, with no in-app purchases.

### Which has better reviews, Gemma GPS or Tomstrails GPS UTM?

Gemma GPS is rated higher. Gemma GPS averages 5.0 out of 5 from 1 ratings, while Tomstrails GPS UTM averages 4.8 from 1.6K ratings.

### Do Gemma GPS or Tomstrails GPS UTM have ads?

Neither Gemma GPS nor Tomstrails GPS UTM shows ads.

### Which is updated more often, Gemma GPS or Tomstrails GPS UTM?

Gemma GPS ships an update every 2 months, and Tomstrails GPS UTM every 6 weeks. Most recently, Gemma GPS was updated on November 1, 2026 and Tomstrails GPS UTM on November 1, 2026.

---

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