# GasSCAN vs Diamond Maps Offline

The clearest difference is update cadence: Diamond Maps Offline at every 3 weeks against GasSCAN's every 4 months. On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for GasSCAN against 5.0 for Diamond Maps Offline. Both are backed by a comparable volume of ratings — 8 and 4 respectively.

GasSCAN ships an update every 4 months, Diamond Maps Offline every 3 weeks. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | GasSCAN | Diamond Maps Offline |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (8 ratings)](https://appshunter.io/ios/app/gasscan/id1361183535/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/diamond-maps-offline/id6443440300/reviews)** |
| Number of ratings | **8** | 4 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 517 MB | 80 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Magnolia River](https://appshunter.io/developer/691329552) | [Ben Hill](https://appshunter.io/developer/1645876200) |

## What reviewers say

### GasSCAN

[App page](https://appshunter.io/ios/app/gasscan/id1361183535)

Scan barcodes or QR codes that comply with ASTM F2897 standards. The app records scan data along with GPS location, allowing for easy export of scan lists in CSV format for GIS integration.

**Highlights:** ASTM F2897 barcode scanning, QR code scanning, GPS data logging, Scan history storage, CSV export, ArcGIS Online integration

**Features:** macOS Compatibility

**In-app purchases:** none


### Diamond Maps Offline

[App page](https://appshunter.io/ios/app/diamond-maps-offline/id6443440300)

Access and modify your Diamond Maps offline. Download maps to your device, make changes, and sync them back to the cloud when you have an internet connection. Ideal for fieldwork when connectivity is limited.

**Highlights:** Download maps for offline use, View and edit map features, Mark new points, Sync changes to the cloud, Turn map layers on and off

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

**In-app purchases:** none


## Frequently asked questions

### Is GasSCAN free?

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

### Is Diamond Maps Offline free?

Diamond Maps Offline is free to download, with no in-app purchases.

### Which has better reviews, GasSCAN or Diamond Maps Offline?

Diamond Maps Offline is rated higher. GasSCAN averages 4.9 out of 5 from 8 ratings, while Diamond Maps Offline averages 5.0 from 4 ratings.

### Do GasSCAN or Diamond Maps Offline have ads?

Neither GasSCAN nor Diamond Maps Offline shows ads.

### Which is updated more often, GasSCAN or Diamond Maps Offline?

GasSCAN ships an update every 4 months, and Diamond Maps Offline every 3 weeks. Most recently, GasSCAN was updated on November 2, 2026 and Diamond Maps Offline on November 3, 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.*