# ISS Detector vs GL Parent

The clearest difference is in-app purchases: GL Parent at none against ISS Detector's 13. GL Parent also leads on ads (none vs shown) and iOS requirement (13.4 vs 16.0). ISS Detector's advantage is update cadence (monthly vs every 4 months). On price and device support there is nothing between them.

Both are free to download. ISS Detector sells 11 in-app purchases, starting at $0.99 per month. GL Parent asks for nothing beyond the download.

ISS Detector ships an update monthly, GL Parent every 4 months. The most recent releases landed on October 24, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | ISS Detector | GL Parent |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (699 ratings)](https://appshunter.io/ios/app/iss-detector/id1198597805/reviews)** | — |
| Number of ratings | **699** | — |
| Positive reviews | 55.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 4 months |
| Monetization | Free with in-app purchases | — |
| Size | 33 MB | 26 MB |
| Requires iOS | 16.0 | **13.4** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Derk Vrijdag](https://appshunter.io/developer/1198597804) | [go-liberty pty ltd](https://appshunter.io/developer/1823887601) |

## What reviewers say

### ISS Detector

[App page](https://appshunter.io/ios/app/iss-detector/id1198597805)

Easily track the International Space Station and other satellites. Receive timely alarms before passes and get weather condition checks for optimal viewing. Enhance functionality with optional in-app purchases to discover more celestial objects.

**Highlights:** ISS tracking and alerts, Weather condition checks, Alarm notifications, Track Starlink trains, Track Hubble telescope, Track amateur radio satellites

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

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access | $0.99 | per month |
| Donation | $1.99 | per month |
| Premium Access | $1.99 | per month |
| Premium Access | $2.99 | per year |
| Premium Access | $5.99 | per year |
| Donation | $5.99 | per year |
| Premium Access | $11.99 | per year |
| Starlink and Famous objects | $3.99 | one-time |
| Amateur Radio Satellites | $3.99 | one-time |
| Comets and Planets | $3.99 | one-time |
| Combo package | $5.99 | one-time |


### GL Parent

[App page](https://appshunter.io/ios/app/gl-parent/id6748052985)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ISS Detector free?

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

### Is GL Parent free?

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

### Do ISS Detector or GL Parent have ads?

ISS Detector shows ads; GL Parent does not.

### Which is updated more often, ISS Detector or GL Parent?

ISS Detector ships an update monthly, and GL Parent every 4 months. Most recently, ISS Detector was updated on October 24, 2026 and GL Parent on October 10, 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.*