# GB Grid Converter vs B4i

The clearest difference is rating: GB Grid Converter at 5.0 against B4i's 3.5. B4i's advantage is in-app purchases (none vs 1) and review sentiment (100% vs 76%). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. GB Grid Converter sells 1 one-off in-app purchase. B4i asks for nothing beyond the download.

GB Grid Converter holds the better App Store score, 5.0 against 3.5. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews complicate that: 76% of GB Grid Converter's written reviews are positive against 100% of B4i's, so the app with the better star average is not the one people write more warmly about.

GB Grid Converter ships an update every 2 months, B4i every 3 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | GB Grid Converter | B4i |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/gb-grid-converter/id382369923/reviews)** | [3.5 (2 ratings)](https://appshunter.io/ios/app/b4i-coordinates-calculator/id915366768/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 75.9% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 10 MB | 17 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Geospike Pty Ltd](https://appshunter.io/developer/500622151) | [Erel Uziel](https://appshunter.io/developer/915366771) |

## What reviewers say

### GB Grid Converter

[App page](https://appshunter.io/ios/app/gb-grid-converter/id382369923)

This app converts British National Grid References to Latitude/Longitude coordinates and vice-versa. It supports both OSGB36 and WGS84 datums. You can view converted coordinates in Maps, send them to other apps, or copy them to your clipboard.

**Highlights:** Convert British National Grid to Lat/Long, Convert Lat/Long to British National Grid, Supports OSGB36 and WGS84, View coordinates in Maps app, Send coordinates to other apps, Copy coordinates to clipboard, Fuzzy parsing for input

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GB Grid Converter Premium | $10.00 | one-time |

**What reviewers like**

- 👍 Brilliant app overall
- 📍 Accurate grid references
- 🗺️ Shows location on map
- 🚀 Navigates to grid reference
- 💡 Instant and accurate grid reference

**What reviewers complain about**

- 🐛 Drop pin no longer gives TQ
- 🔊 No sound when driving
- 📉 Accuracy issues (can't get to 5m)
- 🐛 Clunky and inaccurate interface
- 💥 Crashes iPad Air

**Reported bugs**

- Drop pin does not give TQ anymore unless at location
- No sound when driving to a grid reference
- App crashes when asking for directions on iPad mini
- Latest update has issues, doesn't work on iPhone or iPad
- New marker pins on map not accurate, same grid ref for all pins

**Requested features**

- Direct reference to What 3 Words
- Watch compatibility
- Convert WGS84 to OS grid
- Increase accuracy by another decimal place


### B4i

[App page](https://appshunter.io/ios/app/b4i-coordinates-calculator/id915366768)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GB Grid Converter free?

GB Grid Converter is free to download, with in-app purchases available.

### Is B4i free?

B4i is free to download, with no in-app purchases.

### Which has better reviews, GB Grid Converter or B4i?

GB Grid Converter is rated higher. GB Grid Converter averages 5.0 out of 5 from 1 ratings, while B4i averages 3.5 from 2 ratings.

### Do GB Grid Converter or B4i have ads?

Neither GB Grid Converter nor B4i shows ads.

### Which is updated more often, GB Grid Converter or B4i?

GB Grid Converter ships an update every 2 months, and B4i every 3 months. Most recently, GB Grid Converter was updated on November 1, 2026 and B4i on November 1, 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.*