# Encyclopedia vs Solar System&Celestial Objects

The clearest difference is in-app purchases: Solar System&Celestial Objects at none against Encyclopedia's 1. Solar System&Celestial Objects also leads on update cadence (every 6 weeks vs every 62 months) and iOS requirement (12.0 vs 15.0). Encyclopedia's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Encyclopedia sells 1 one-off in-app purchase. Solar System&Celestial Objects asks for nothing beyond the download.

Encyclopedia ships an update every 62 months, Solar System&Celestial Objects every 6 weeks. The most recent releases landed on September 3, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | Encyclopedia | Solar System&Celestial Objects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (14 ratings)](https://appshunter.io/ios/app/encyclopedia-solar-system/id1124568774/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 62 months | **Every 6 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 322 MB | 62 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Good Spider, LLC](https://appshunter.io/developer/1487595667) | [NIKI TECH](https://appshunter.io/developer/1788609104) |

## What reviewers say

### Encyclopedia

[App page](https://appshunter.io/ios/app/encyclopedia-solar-system/id1124568774)

Explore the solar system with extensive articles and high-definition images. This app offers comprehensive information, engaging content, and a user-friendly interface, making it suitable for both children and adults interested in space.

**Highlights:** Thousands of articles and HD photos, Comprehensive solar system information, Engaging and easy-to-understand content, Offline availability, Badge collection for reading, Intuitive user interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $2.99 | one-time |


### Solar System&Celestial Objects

[App page](https://appshunter.io/ios/app/solar-system-and-celestial-objects/id6503188651)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Encyclopedia free?

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

### Is Solar System&Celestial Objects free?

Solar System&Celestial Objects is free to download, with no in-app purchases.

### Do Encyclopedia or Solar System&Celestial Objects have ads?

Solar System&Celestial Objects shows ads; Encyclopedia does not.

### Which is updated more often, Encyclopedia or Solar System&Celestial Objects?

Encyclopedia ships an update every 62 months, and Solar System&Celestial Objects every 6 weeks. Most recently, Encyclopedia was updated on September 3, 2026 and Solar System&Celestial Objects on May 16, 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.*