GB Grid Converter vs B4i
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GB Grid Converter
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.
- 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
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Easily convert between British National Grid References (OS Grid Refs) and Latitude, Longitude coordinates (both OSGB36 and WGS84 are supplied). Then, easily view the converted coordinate in the Maps app, or send it to GPS Log (our app for recording your travels). Or copy to the clipboard using the standard iPhone functions. Fuzzy parsing logic allows you to input coordinates in a variety of ways, like "TQ 30267 76930", and "TQ302769". If you have any problems using this software, please contact us by email: support-at-gpslog.com so we can work with you to solve the problem. Issues left as reviews are difficult to address.
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.
Screenshots
Verdict
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.
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. 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.
| Parameter | GB Grid Converter | B4i |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 3.5 (2 ratings) |
| Positive reviews | 75.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 2 months — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 10 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Geospike Pty Ltd | Erel Uziel |
Customer experience
GB Grid Converter
B4i
Bugs and requests
GB Grid Converter
Reported bugs
6 issues- 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
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- App is deficient due to Apple's default map
Requested features
4 requests- Direct reference to What 3 Words
- Watch compatibility
- Convert WGS84 to OS grid
- Increase accuracy by another decimal place
B4i
Not enough reviews yet to summarise bugs or requests.
In-app purchases
GB Grid Converter
- GB Grid Converter Premium$10.00
B4i
No in-app purchases
Questions
Is GB Grid Converter free?
Is B4i free?
Which has better reviews, GB Grid Converter or B4i?
Do GB Grid Converter or B4i have ads?
Which is updated more often, GB Grid Converter or B4i?
Other comparisons
