# Altimeter+ vs GPSlogger Kalman

The clearest difference is in-app purchases: Altimeter+ at none against GPSlogger Kalman's 1. Altimeter+ also leads on chart position (#147 vs unranked) and price ($1.99 vs $3.99). GPSlogger Kalman's advantage is update cadence (monthly vs every 2 months). On ads and device support there is nothing between them.

Altimeter+ costs $1.99 and GPSlogger Kalman $3.99 up front. GPSlogger Kalman sells 1 one-off in-app purchase. Altimeter+ asks for nothing beyond the download.

Altimeter+ ships an update every 2 months, GPSlogger Kalman monthly. The most recent releases landed on October 19, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Altimeter+ | GPSlogger Kalman |
| --- | --- | --- |
| Price | **$1.99** | $3.99 |
| Rating | **[4.5 (700 ratings)](https://appshunter.io/ios/app/altimeter-plus/id417204570/reviews)** | — |
| Number of ratings | **700** | — |
| Positive reviews | 79.6% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | — |
| Best chart rank | **#147** | — |
| Size | 45 MB | 15 MB |
| Requires iOS | **11.1** | 17.6 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Sichtwerk AG](https://appshunter.io/developer/410851296) | [Almansor Kerroum](https://appshunter.io/developer/1521553556) |

## What reviewers say

### Altimeter+

[App page](https://appshunter.io/ios/app/altimeter-plus/id417204570)

**Currently charting:** #147 Top Paid · Navigation (US App Store)

This app measures your current altitude using GPS, ASTER data, or your device's barometer. It offers an integrated map with peak data, a compass, and distance grids, functioning even without active GPS.

**Highlights:** GPS, ASTER, and barometer altitude measurement, Average altitude calculation, Integral map with peak indicator, Compass and distance grid, Apple Watch support, Works without active GPS

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Accurate and reliable
- 🗺️ Useful map and GPS features
- 💡 Helpful for hiking, flying, and various activities
- 🔍 Precise altitude readings
- 🔨 Simple and easy to use

**What reviewers complain about**

- 🐛 Calibration issues on Apple Watch
- 🔋 High battery consumption on Apple Watch
- 🌞 Difficult to read in bright sunlight
- 🤖 Compatibility issues with newer iOS versions

**Reported bugs**

- App crashes when trying to calibrate or access settings
- Altimeter readings are inaccurate or inconsistent
- App not working on certain devices or iOS versions

**Requested features**

- Add option to display altitude in feet or meters
- Implement automatic calibration using GPS
- Add complication support for Apple Watch
- Provide above ground level (AGL) altitude reading


### GPSlogger Kalman

[App page](https://appshunter.io/ios/app/gpslogger-kalman/id1521553554)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $3.99 | one-time |


## Frequently asked questions

### Is Altimeter+ free?

Altimeter+ costs $1.99, with no in-app purchases.

### Is GPSlogger Kalman free?

GPSlogger Kalman costs $3.99, and also offers in-app purchases.

### Do Altimeter+ or GPSlogger Kalman have ads?

Neither Altimeter+ nor GPSlogger Kalman shows ads.

### Which is updated more often, Altimeter+ or GPSlogger Kalman?

Altimeter+ ships an update every 2 months, and GPSlogger Kalman monthly. Most recently, Altimeter+ was updated on October 19, 2026 and GPSlogger Kalman on October 15, 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.*