# Exoplanet Explorer vs Universe Size Comparison

The clearest difference is price: Exoplanet Explorer at Free against Universe Size Comparison's $1.99. Exoplanet Explorer also leads on rating (4.6 vs 3.2) and review sentiment (100% vs 70%). Universe Size Comparison's advantage is in-app purchases (none vs 2). On ratings volume, ads and iOS requirement there is nothing between them.

Exoplanet Explorer is free to download; Universe Size Comparison costs $1.99 up front. Exoplanet Explorer sells 2 in-app purchases, starting at $2.99 per 3 months. Universe Size Comparison asks for nothing beyond the download.

Exoplanet Explorer holds the better App Store score, 4.6 against 3.2. Both are backed by a comparable volume of ratings — 70 and 30 respectively. Written reviews point the same way: 100% of Exoplanet Explorer's written reviews are positive against 70% of Universe Size Comparison's.

Exoplanet Explorer ships an update every 2 weeks, Universe Size Comparison every 3 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Exoplanet Explorer | Universe Size Comparison |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.6 (70 ratings)](https://appshunter.io/ios/app/exoplanet-explorer/id1457614833/reviews)** | [3.2 (30 ratings)](https://appshunter.io/ios/app/universe-size-comparison/id1473946290/reviews) |
| Number of ratings | **70** | 30 |
| Positive reviews | **100.0% of reviews** | 70.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Monetization | **Freemium** | Paid |
| Size | 171 MB | 411 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch, Vision Pro** | iPhone, iPad, Apple TV |
| Age rating | 4+ | +4 |
| Developer | [Carsten Knoblich](https://appshunter.io/developer/541438854) | [Daniele Citi](https://appshunter.io/developer/1187632258) |

## What reviewers say

### Exoplanet Explorer

[App page](https://appshunter.io/ios/app/exoplanet-explorer/id1457614833)

Explore a vast catalog of over 6,000 confirmed exoplanets with detailed scientific data. Compare worlds, visualize habitable zones, and track new discoveries. Ideal for stargazers, students, educators, and researchers.

**Highlights:** 6,000+ confirmed exoplanets, Detailed scientific data, Advanced filtering and sorting, Planet comparison tool, Habitable zone analysis, Home screen widgets, Apple Watch companion app

**Features:** Family Sharing, Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3 months subscription | $2.99 | per 3 months |
| 12 months subscription | $6.99 | per year |


### Universe Size Comparison

[App page](https://appshunter.io/ios/app/universe-size-comparison/id1473946290)

Explore the vastness of space and understand celestial body dimensions through interactive 3D comparisons. Discover the scale of planets and stars, from our Sun to hypergiant stars, with guided tours and free comparison modes.

**Highlights:** 3D astronomical comparisons, Tour Mode with guided explanations, Free Mode for custom comparisons, Scale comparisons of planets and stars, Detailed celestial body information, Elegant user interface

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

**In-app purchases:** none


## Frequently asked questions

### Is Exoplanet Explorer free?

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

### Is Universe Size Comparison free?

Universe Size Comparison costs $1.99, with no in-app purchases.

### Which has better reviews, Exoplanet Explorer or Universe Size Comparison?

Exoplanet Explorer is rated higher. Exoplanet Explorer averages 4.6 out of 5 from 70 ratings, while Universe Size Comparison averages 3.2 from 30 ratings.

### Do Exoplanet Explorer or Universe Size Comparison have ads?

Neither Exoplanet Explorer nor Universe Size Comparison shows ads.

### Which is updated more often, Exoplanet Explorer or Universe Size Comparison?

Exoplanet Explorer ships an update every 2 weeks, and Universe Size Comparison every 3 months. Most recently, Exoplanet Explorer was updated on November 2, 2026 and Universe Size Comparison on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*