B4i vs Grid Ref GK
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
B4i
This navigation tool converts between UTM and Lat/Lon coordinate systems, supporting various datums and formats. It displays current navigational information and allows sharing locations via SMS or email. Features include text-to-speech for coordinates and an animated compass.
- UTM to Lat/Lon conversion
- Support for different datums
- Current navigational information display
- Location sharing via SMS/Email
- Text-to-speech for coordinates
- Animated compass
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A navigational calculator that allows converting between UTM and Lat / Lon coordinates systems and between different datums and formats. The second page shows the current navigational information and allows you to send the location by SMS or Email. New Speak button. Speaks the current coordinate (text to speech). New animated compass.
Grid Ref GK
This app helps you find your precise location using the Gauß-Krüger coordinate system, providing both GK grid references and WGS84 latitude/longitude. It displays the accuracy of your device's readings and allows you to easily share your location data via text, email, or other services. While primarily designed for use in Germany, it functions internationally and includes a guide to the GK system.
- Gauß-Krüger grid reference
- WGS84 Latitude and Longitude
- Device reading accuracy display
- Location sharing (text, email, tweet)
- Copy location to clipboard
- Graphical guide to GK system
- International operation
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For use with maps / location data / topology using the Gauß-Krüger-Koordinatensystem. Find out where you are on the Gauss Kruger (GK) system, immediately, and accurately. App Provides: Gauß-Krüger Grid Ref, and WGS84 Latitude and Longitude values. The Accuracy of Readings, as indicated by your device, will also be shown. Share your Location via Text, Email, Tweet etc, or Copy to the Clipboard. (Sharing options and services will vary, depending on the device setup). Though aimed at use in Germany, the app will operate internationally. App includes a graphical guide to the GK Coordinate System. Ideally suited for use by walkers, hikers and outdoor sports enthusiasts. It is recommended that you should always carry a map and physical compass when on outdoor pursuits.
Screenshots
Verdict
The clearest difference is rating: Grid Ref GK at 4.3 against B4i's 3.5. Grid Ref GK also leads on iOS requirement (11.0 vs 15.0). B4i's advantage is in-app purchases (none vs 1) and update cadence (every 3 months vs every 12 months). On price, ratings volume, ads and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Grid Ref GK sells 1 one-off in-app purchase. B4i asks for nothing beyond the download.
Grid Ref GK holds the better App Store score, 4.3 against 3.5. Both are backed by a comparable volume of ratings — 2 and 3 respectively.
B4i ships an update every 3 months, Grid Ref GK every 12 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | B4i | Grid Ref GK |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (2 ratings) | 4.3 (3 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 | 3 — better |
| Update frequency | Every 3 months — better | Every 12 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 17 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Erel Uziel | Mike Irving |
Customer experience
B4i
Grid Ref GK
In-app purchases
B4i
No in-app purchases
Grid Ref GK
- Go Ad Free$0.99
