# Zelmux vs OrbitLog

The clearest difference is in-app purchases: Zelmux at none against OrbitLog's 1. Zelmux also leads on ads (none vs shown) and iOS requirement (16.0 vs 18.0). OrbitLog's advantage is update cadence (every 6 days vs every 3 weeks). On price and device support there is nothing between them.

Both are free to download. OrbitLog sells 1 one-off in-app purchase. Zelmux asks for nothing beyond the download.

Zelmux ships an update every 3 weeks, OrbitLog every 6 days. The most recent releases landed on October 8, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Zelmux | OrbitLog |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/orbitlog-space-tracker-hub/id6791340139/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | — | Free with in-app purchases |
| Size | 6 MB | 11 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yang Zhang](https://appshunter.io/developer/1005259025) | [Benjamin Clary](https://appshunter.io/developer/1397995407) |

## What reviewers say

### Zelmux

[App page](https://appshunter.io/ios/app/zelmux/id6768126927)

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

**In-app purchases:** none


### OrbitLog

[App page](https://appshunter.io/ios/app/orbitlog-space-tracker-hub/id6791340139)

Transform your device into a space command center. Track satellites, view upcoming rocket launches, monitor astronauts in orbit, and observe asteroids and meteor showers, all localized to your location.

**Highlights:** Live satellite tracking, Global launch calendar, Live countdowns and streams, Astronaut roster, Near-Earth object tracker, Meteor shower calendar

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads Forever | $2.99 | one-time |


## Frequently asked questions

### Is Zelmux free?

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

### Is OrbitLog free?

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

### Do Zelmux or OrbitLog have ads?

OrbitLog shows ads; Zelmux does not.

### Which is updated more often, Zelmux or OrbitLog?

Zelmux ships an update every 3 weeks, and OrbitLog every 6 days. Most recently, Zelmux was updated on October 8, 2026 and OrbitLog on September 24, 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.*