Comparison

GB Grid Converter vs GPS OS Grid Reference

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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.

About

GPS OS Grid Reference

This app accurately pinpoints your location on Ordnance Survey maps for Great Britain and Ireland, even without a phone signal. It offers precise grid references, waypoint creation, and navigation features. The display is designed for clarity in all lighting conditions, and it optimizes battery usage.

Highlights
  • Offline map location
  • Accurate grid references
  • Waypoint creation and management
  • High-contrast display
  • Battery optimization
  • Share waypoints
Features
Read full description

GPS OS provides a fast and accurate way to locate your position on an Ordnance Survey map, both in Great Britain and Ireland. • No phone signal required - works in the most remote locations. • OSTN15 transform data for high conversion accuracy (better than 1m). • 6, 8 and 10 figure grid references. • A large, clear, high contrast display ensures you can easily read your position in any light conditions. • Optimises the frequency of position updates depending on battery charge and speed of travel to make sure you can always make calls at the end of the day. • Create waypoints from a map, your current location or manually enter Ordnance Survey coordinates. • Explore waypoints and get directions in Apple Maps. • Share waypoints with other apps or users. • No adverts. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Includes OSTN15 transform data licensed with permission. Copyright and database rights Ordnance Survey Limited 2016, ©Crown copyright and database rights Land and Property Services 2016 and/or ©Ordnance Survey Ireland, 2016. All rights reserved.

Screenshots

GB Grid Converter2 screens
GPS OS Grid Reference4 screens

Verdict

The call

The clearest difference is rating: GB Grid Converter at 5.0 against GPS OS Grid Reference's 4.4. GB Grid Converter also leads on iOS requirement (16.6 vs 18.0). GPS OS Grid Reference's advantage is ratings volume (17 vs 1) and review sentiment (90% vs 76%). On price, update cadence, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. GB Grid Converter sells 1 one-off in-app purchase and GPS OS Grid Reference sells 2 in-app purchases, starting at $5.99 per year. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

GB Grid Converter holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: GPS OS Grid Reference has 17 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 76% of GB Grid Converter's written reviews are positive against 90% of GPS OS Grid Reference's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

GB Grid Converter ships an update every 2 months, GPS OS Grid Reference every 3 months. The most recent releases landed on September 14, 2026 and September 22, 2026 respectively.

Scorecard4 real differences · 6 level
GB Grid Converter versus GPS OS Grid Reference: the parameters behind the verdict, then further details
ParameterGB Grid ConverterGPS OS Grid Reference
PriceFreeFree
Rating5.0 (1 ratings) — better4.4 (17 ratings)
Positive reviews75.9% of reviews89.9% of reviews — better
Number of ratings117 — better
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, Apple Watch
Requires iOS16.6 — better18.0
Further details — not scored
Size10 MB11 MB
Age rating4+4+
DeveloperGeospike Pty LtdTomstrails.com

Customer experience

GB Grid Converter

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews54 reviews
Positive75.9%
Neutral7.4%
Negative16.7%

GPS OS Grid Reference

All ratings17 ratings
Positive82.4%
Neutral5.9%
Negative11.8%
Written reviews99 reviews
Positive89.9%
Neutral1.0%
Negative9.1%

Bugs and requests

GB Grid Converter

Not enough reviews yet to summarise bugs or requests.

GPS OS Grid Reference

Reported bugs

5 issues
  • Waypoint finder satellite view is blurry
  • Compass is not accurate
  • Accuracy has dropped recently
  • Location services permanently dimmed off (iOS)
  • App does not work for users not in England

Requested features

10 requests
  • Add map data and search functionality
  • Improve satellite map clarity
  • Add ability to view location on a map
  • Enable navigation from point to point
  • Add Apple Watch equivalent app
Show 5 more
  • Display latitude and longitude
  • Add a dynamic display for accuracy improvement
  • Implement time averaging for accuracy
  • Allow copying grid reference to clipboard
  • Add facility to store and recall reference information

In-app purchases

1 purchases

GB Grid Converter

One-time1
  • GB Grid Converter Premium$10.00
2 purchases

GPS OS Grid Reference

Subscriptions1
  • Premium Features7 Days trial$5.991 Year
One-time1
  • Feature Pack - Compass & sharing features.Free

Questions

Is GB Grid Converter free?
GB Grid Converter is free to download, with in-app purchases available.
Is GPS OS Grid Reference free?
GPS OS Grid Reference is free to download, with in-app purchases available.
Which has better reviews, GB Grid Converter or GPS OS Grid Reference?
GB Grid Converter is rated higher. GB Grid Converter averages 5.0 out of 5 from 1 ratings, while GPS OS Grid Reference averages 4.4 from 17 ratings.
Do GB Grid Converter or GPS OS Grid Reference have ads?
Neither GB Grid Converter nor GPS OS Grid Reference shows ads.
Which is updated more often, GB Grid Converter or GPS OS Grid Reference?
GB Grid Converter ships an update every 2 months, and GPS OS Grid Reference every 3 months. Most recently, GB Grid Converter was updated on September 14, 2026 and GPS OS Grid Reference on September 22, 2026.

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