# Altimeter vs Skymaster SM

The clearest difference is in-app purchases: Skymaster SM at none against Altimeter's 5. Skymaster SM also leads on update cadence (every 11 days vs every 3 months) and iOS requirement (15.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Altimeter sells 5 in-app purchases, starting at $1.99 per year. Skymaster SM asks for nothing beyond the download.

Altimeter ships an update every 3 months, Skymaster SM every 11 days. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Altimeter | Skymaster SM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (21 ratings)](https://appshunter.io/ios/app/altimeter-elevation-and-gps/id1067580904/reviews)** | — |
| Number of ratings | **21** | — |
| Positive reviews | 96.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 11 days** |
| Monetization | Free | — |
| Size | 17 MB | 241 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [22of8 GmbH](https://appshunter.io/developer/502617768) | [Smartsurv](https://appshunter.io/developer/1121681538) |

## What reviewers say

### Altimeter

[App page](https://appshunter.io/ios/app/altimeter-elevation-and-gps/id1067580904)

Determine your current altitude and save important locations to navigate back to them later. This app supports multiple coordinate systems and can be used on iPhone, iPad, and Apple Watch. It prioritizes battery saving by only using GPS when the app is active.

**Highlights:** Current altitude measurement, Save and navigate to locations, Multiple coordinate systems, Share location and altitude, Apple Watch support, Battery-saving GPS usage

**Features:** Apple Watch app

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Supporter | $1.99 | per year |
| Generous tip | $1.99 | one-time |
| Massive tip | $3.99 | one-time |
| Amazing tip | $8.99 | one-time |
| Buy me a Mac | $599.99 | one-time |


### Skymaster SM

[App page](https://appshunter.io/ios/app/skymaster-sm/id6462679615)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Altimeter free?

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

### Is Skymaster SM free?

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

### Do Altimeter or Skymaster SM have ads?

Neither Altimeter nor Skymaster SM shows ads.

### Which is updated more often, Altimeter or Skymaster SM?

Altimeter ships an update every 3 months, and Skymaster SM every 11 days. Most recently, Altimeter was updated on October 24, 2026 and Skymaster SM on October 20, 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.*