# ISS Detector vs HamStudy.org

The clearest difference is price: ISS Detector at Free against HamStudy.org's $3.99. HamStudy.org's advantage is review sentiment (94% vs 55%) and in-app purchases (none vs 13). On update cadence, device support and iOS requirement there is nothing between them.

ISS Detector is free to download; HamStudy.org costs $3.99 up front. ISS Detector sells 11 in-app purchases, starting at $0.99 per month. HamStudy.org asks for nothing beyond the download.

HamStudy.org holds the better App Store score, 4.9 against 4.6. Both are backed by a comparable volume of ratings — 633 and 2.7K respectively. Written reviews point the same way: 55% of ISS Detector's written reviews are positive against 94% of HamStudy.org's.

ISS Detector ships an update monthly, HamStudy.org every 3 weeks. The most recent releases landed on October 12, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | ISS Detector | HamStudy.org |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [4.6 (633 ratings)](https://appshunter.io/ios/app/iss-detector/id1198597805/reviews) | **[4.9 (2.7K ratings)](https://appshunter.io/ios/app/hamstudyorg/id1371288324/reviews)** |
| Number of ratings | 633 | **2.7K** |
| Positive reviews | 55.4% of reviews | **93.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | — | **#7** |
| Size | 33 MB | 30 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Derk Vrijdag](https://appshunter.io/developer/1198597804) | [Signal Stuff](https://appshunter.io/developer/1371288323) |

## 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 |


### HamStudy.org

[App page](https://appshunter.io/ios/app/hamstudyorg/id1371288324)

**Currently charting:** #7 Top Paid · Education, #66 Top Paid (US App Store)

This app offers an intelligent study mode that tracks your progress and focuses on areas where you struggle. It allows you to tailor your study to specific chapters and topics from license manuals, with explanations for difficult questions. Practice exams are also available.

**Highlights:** Intelligent study algorithms, Vetted user-submitted explanations, Infinite practice exams, Study all US Amateur Radio question pools, International question pools, Multi-user support, Cross-device progress sync

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Great study tool
- 👍 Easy to use
- 🚀 Efficient way to prepare for exams
- 🚀 Comprehensive coverage of exam material
- 👍 Helpful explanations and hints

**What reviewers complain about**

- 🐛 Occasional app freezes
- 👎 Some explanations could be clearer
- 🔋 Battery drain when using app extensively

**Reported bugs**

- Email support not working
- Occasional freezing or crashing

**Requested features**

- Dark mode option
- Ability to clear test history
- More detailed performance analytics
- Spell out acronyms and define technical terms


## Frequently asked questions

### Is ISS Detector free?

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

### Is HamStudy.org free?

HamStudy.org costs $3.99, with no in-app purchases.

### Which has better reviews, ISS Detector or HamStudy.org?

HamStudy.org is rated higher. ISS Detector averages 4.6 out of 5 from 633 ratings, while HamStudy.org averages 4.9 from 2.7K ratings.

### Do ISS Detector or HamStudy.org have ads?

ISS Detector shows ads; HamStudy.org does not.

### Which is updated more often, ISS Detector or HamStudy.org?

ISS Detector ships an update monthly, and HamStudy.org every 3 weeks. Most recently, ISS Detector was updated on October 12, 2026 and HamStudy.org on October 14, 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.*