GridPoint GB vs OS2Maps
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GridPoint GB
Locate yourself on a paper Ordnance Survey map using your iPhone's GPS and compass, even without mobile reception. It provides your grid reference and heading, with accurate coordinate conversions. Features include Apple Watch integration, location sharing, and sunset/sunrise times.
- GPS and compass for location
- Accurate coordinate conversions
- Apple Watch app and complication
- Location sharing
- Sunset and sunrise times
- Distress signal
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If you have a paper Ordnance Survey (OS) map, GridPoint GB makes it easy to locate yourself — even when you've got no mobile reception. The app uses your iPhone's GPS and compass to provide your current grid reference and heading, and illustrates how to use this to locate yourself on the map. Coordinate conversions are implemented via OS's OSTN02, accurate to within 1m. The app also: * Includes an Apple Watch app and associated complication * Reports full numerical easting and northing, tetrad, raw latitude/longitude, a nearby postcode, and various heading parameters * Has a sharing facility so you can share, copy or store your location * Calculates next sunset and sunrise times * Can emit a distress signal, just in case All features are free to use — the in-app purchase is simply a tip you can give the developer to show appreciation. For details and instructions, please see http://mackerron.com/gridpointgb/ Please note: this app works ONLY in Britain (i.e. England, Scotland or Wales). It does not operate in other parts of the UK or British Isles and cannot provide coordinates in Northern Ireland or the Republic of Ireland, since a different coordinate system is used.
OS2Maps
This app converts UK Ordnance Survey grid references into standard GPS coordinates. Once converted, it allows you to easily open these locations in Apple Maps or Google Maps for navigation. It's ideal for planning outdoor activities where starting points are given in OS grid format.
- Convert UK OS grid references
- Generate GPS latitude and longitude
- Open locations in Apple Maps
- Open locations in Google Maps
- Navigate to converted locations
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Convert UK Ordinance Survey grid references into standard GPS latitude and longitude. Following conversion the app enables the location to be opened easily in Apple or Google Maps. This is useful for situations such as when a start location for a walk is provided in OS grid format as this enables Apple or Google Maps to be used to navigate to the start easily.
Screenshots
Verdict
The clearest difference is price: GridPoint GB at Free against OS2Maps's $1.99. GridPoint GB also leads on review sentiment (72% vs 50%). OS2Maps's advantage is update cadence (every 6 days vs every 16 months). On ads, in-app purchases, device support and iOS requirement 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
GridPoint GB is free to download; OS2Maps costs $1.99 up front. GridPoint GB sells 3 one-off in-app purchases and OS2Maps sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
GridPoint GB ships an update every 16 months, OS2Maps every 6 days. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.
| Parameter | GridPoint GB | OS2Maps |
|---|---|---|
| Price | Free — better | $1.99 |
| Positive reviews | 72.3% of reviews — better | 50.0% of reviews |
| Update frequency | Every 16 months | Every 6 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 23 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | George MacKerron | Alastair Begley |
Customer experience
GridPoint GB
OS2Maps
Bugs and requests
GridPoint GB
Reported bugs
17 issues- Won't open on latest iOS
- App just closes as soon as it opens
- Crashes when opened
- Crashes and closes a few seconds after starting on iOS 9
- Won't open and keeps crashing since iOS upgrade
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- Application remains unfixed since move to iOS9
- Freezes on iPhone 6
- Freezes on phone on home page and does not shut down
- Crash on startup
- Quits on startup on iPhone 6 and iOS9.1
- Not working on latest iOS
- iOS 9 has killed it
- Crashes instantly
- Crashing continuously on iOS9
- Issue with iOS9
- Splash screen appears then it just closes straightaway on iOS9.0.2
- Broken temporarily by iOS 9
Requested features
12 requests- See 8-figure grid and altitude on watch complication
- Switch to tetrad view
- Option to change to 6-figure grid
- Record a small note when saving a location
- Convert to mils mag as well as degrees
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- Option to put in grids and navigate between them
- iWatch version
- See grid magnetic angle without calculation
- OS map layer under the graphic
- Add waypoints and pre-loaded mapping
- Memory Map or other ordnance survey maps on iPhone
- Give tetrad as well as grid reference
OS2Maps
Not enough reviews yet to summarise bugs or requests.
In-app purchases
GridPoint GB
- Magnificent tip$2.99
- Majestic tip$4.99
- Monumental tip$8.99
OS2Maps
- Unlock OS2Maps$3.99
