# StarTracker HD vs Urinary System Quiz

The clearest difference is review sentiment: StarTracker HD at 59% against Urinary System Quiz's 0%. StarTracker HD also leads on rating (4.0 vs 1.0) and update cadence (every 5 months vs every 29 months). Urinary System Quiz's advantage is price ($1.99 vs $3.99) and device support (3 vs 1). On ads, in-app purchases, monetization model and iOS requirement there is nothing between them.

StarTracker HD costs $3.99 and Urinary System Quiz $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

StarTracker HD holds the better App Store score, 4.0 against 1.0. That said, the two scores are not equally well evidenced: StarTracker HD has 43 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 59% of StarTracker HD's written reviews are positive against 0% of Urinary System Quiz's.

StarTracker HD ships an update every 5 months, Urinary System Quiz every 29 months. The most recent releases landed on October 22, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | StarTracker HD | Urinary System Quiz |
| --- | --- | --- |
| Price | $3.99 | **$1.99** |
| Rating | **[4.0 (43 ratings)](https://appshunter.io/ios/app/startracker-hd-mobile-skymap/id449605942/reviews)** | [1.0 (2 ratings)](https://appshunter.io/ios/app/urinary-system-quiz-anatomy/id1540345802/reviews) |
| Number of ratings | **43** | 2 |
| Positive reviews | **59.4% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 29 months |
| Monetization | Paid | Paid |
| Size | 25 MB | 56 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [身吉 潘](https://appshunter.io/developer/341563645) | [Alpha Dog Marketing LLC](https://appshunter.io/developer/1532429744) |

## What reviewers say

### StarTracker HD

[App page](https://appshunter.io/ios/app/startracker-hd-mobile-skymap/id449605942)

Explore the night sky with this augmented reality planetarium. Identify stars, constellations, planets, and deep sky objects by simply pointing your device at the sky. All data is available offline.

**Highlights:** Augmented Reality Star Gazing, Identify 8000+ stars, planets, and constellations, Offline data access, Search and lock celestial objects, Time Machine feature, High-quality graphics

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 🚀 Smooth, fluid graphics and responsive gyroscope tracking
- 👍 Intuitive and easy-to-use interface
- 🌟 Beautiful HD visuals and stunning design
- 📍 Accurate real-time sky positioning and planet/constellation identification
- 🎓 Excellent educational tool for learning astronomy

**What reviewers complain about**

- 🐛 Frequent crashes on various devices
- 🐛 Compass/gyroscope malfunction issues
- 🐛 Screen display problems on larger tablets
- ❌ Limited functionality and educational depth
- ❌ Lack of object information and descriptions

**Reported bugs**

- App crashes on startup or during use
- Compass direction incorrect (north pointing wrong direction)
- Gyroscope not responding or locked
- Share button causes crashes
- Forward/share button greying out and causing screen loss

**Requested features**

- Add search functionality for celestial objects
- Include ISS and satellite tracking
- Display object information (distance, magnitude, color, brightness)
- Add ecliptic line visibility option
- Show coordinate information (RA, Dec, Alt, Azimuth)


### Urinary System Quiz

[App page](https://appshunter.io/ios/app/urinary-system-quiz-anatomy/id1540345802)

Test your knowledge of the urinary system with over 300 quiz questions covering structure, function, and core concepts. Features three difficulty levels to aid in class preparation and grade improvement.

**Highlights:** Over 300 quiz questions, Covers structure and function, Includes excretion, renal circulation, nephron, Three difficulty levels, Helps prepare for class, Improves grades

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

**In-app purchases:** none


## Frequently asked questions

### Is StarTracker HD free?

StarTracker HD costs $3.99, with no in-app purchases.

### Is Urinary System Quiz free?

Urinary System Quiz costs $1.99, with no in-app purchases.

### Which has better reviews, StarTracker HD or Urinary System Quiz?

StarTracker HD is rated higher. StarTracker HD averages 4.0 out of 5 from 43 ratings, while Urinary System Quiz averages 1.0 from 2 ratings.

### Do StarTracker HD or Urinary System Quiz have ads?

Neither StarTracker HD nor Urinary System Quiz shows ads.

### Which is updated more often, StarTracker HD or Urinary System Quiz?

StarTracker HD ships an update every 5 months, and Urinary System Quiz every 29 months. Most recently, StarTracker HD was updated on October 22, 2026 and Urinary System Quiz on October 29, 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.*