# Mapslock vs GPS Altimeter & Barometer

The clearest difference is in-app purchases: Mapslock at none against GPS Altimeter & Barometer's 3. Mapslock also leads on iOS requirement (12.0 vs 17.0). GPS Altimeter & Barometer's advantage is update cadence (fortnightly vs every 25 months). On price, ads and device support there is nothing between them.

Both are free to download. GPS Altimeter & Barometer sells 3 in-app purchases, starting at $1.99 per month. Mapslock asks for nothing beyond the download.

Mapslock ships an update every 25 months, GPS Altimeter & Barometer fortnightly. The most recent releases landed on October 18, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Mapslock | GPS Altimeter & Barometer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (17 ratings)](https://appshunter.io/ios/app/gps-altimeter-and-barometer/id6739153056/reviews)** |
| Number of ratings | — | **17** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 25 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 53 MB | 23 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 17+ | 4+ |
| Developer | [Gonzalo Maino](https://appshunter.io/developer/1614664700) | [Mobile Card Games & Travel Apps LLC](https://appshunter.io/developer/453389232) |

## What reviewers say

### Mapslock

[App page](https://appshunter.io/ios/app/mapslock/id6451317633)

**Features:** macOS Compatibility

**In-app purchases:** none


### GPS Altimeter & Barometer

[App page](https://appshunter.io/ios/app/gps-altimeter-and-barometer/id6739153056)

Easily check your current altitude with a large, clear display. Track your elevation changes, minimum and maximum points, and vertical speed. Offers GPS or barometric readings and can share your altitude data.

**Highlights:** Large, high-contrast altitude display, GPS and barometric altitude options, Track min/max altitude and rate of change, View vertical speed and accuracy, Share altitude data as text or image, Elevation history graph (Pro)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GPS Pro Monthly Subscription | $1.99 | per month |
| Discount Lifetime Pro | $2.99 | one-time |
| Pro | $4.99 | one-time |


## Frequently asked questions

### Is Mapslock free?

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

### Is GPS Altimeter & Barometer free?

GPS Altimeter & Barometer is free to download, with in-app purchases available.

### Do Mapslock or GPS Altimeter & Barometer have ads?

Neither Mapslock nor GPS Altimeter & Barometer shows ads.

### Which is updated more often, Mapslock or GPS Altimeter & Barometer?

Mapslock ships an update every 25 months, and GPS Altimeter & Barometer fortnightly. Most recently, Mapslock was updated on October 18, 2026 and GPS Altimeter & Barometer on October 30, 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.*