# Altimeter X. vs ISS Tracker

The clearest difference is in-app purchases: ISS Tracker at none against Altimeter X.'s 1. Altimeter X.'s advantage is iOS requirement (13.0 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Altimeter X. sells 1 one-off in-app purchase. ISS Tracker asks for nothing beyond the download.

Altimeter X. ships an update every 5 days, ISS Tracker weekly. The most recent releases landed on October 30, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Altimeter X. | ISS Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (20 ratings)](https://appshunter.io/ios/app/iss-tracker-space-station/id6740058138/reviews)** |
| Number of ratings | — | **20** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Weekly |
| Monetization | — | Free |
| Size | 49 MB | 15 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hubert Willy Lehmann](https://appshunter.io/developer/1684815110) | [Lucent Enterprises Ltd.](https://appshunter.io/developer/1448644115) |

## What reviewers say

### Altimeter X.

[App page](https://appshunter.io/ios/app/altimeter-x/id6708236560)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### ISS Tracker

[App page](https://appshunter.io/ios/app/iss-tracker-space-station/id6740058138)

Monitor the International Space Station's live position and vital telemetry data in real-time. Track its orbit, altitude, velocity, and internal environmental systems. Ideal for space enthusiasts and students interested in space exploration.

**Highlights:** Real-time ISS position tracking, Interactive world map, Altitude and velocity data, Comprehensive telemetry monitoring, Environmental and power system data, Dark mode support

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Altimeter X. free?

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

### Is ISS Tracker free?

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

### Do Altimeter X. or ISS Tracker have ads?

Neither Altimeter X. nor ISS Tracker shows ads.

### Which is updated more often, Altimeter X. or ISS Tracker?

Altimeter X. ships an update every 5 days, and ISS Tracker weekly. Most recently, Altimeter X. was updated on October 30, 2026 and ISS Tracker on November 4, 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.*