# Solar Book vs Solar System&Celestial Objects

The clearest difference is ads: Solar Book at none against Solar System&Celestial Objects's shown. Solar System&Celestial Objects's advantage is update cadence (every 6 weeks vs every 14 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Solar Book ships an update every 14 months, Solar System&Celestial Objects every 6 weeks. The most recent releases landed on October 3, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Solar Book | Solar System&Celestial Objects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/solar-book/id1078873201/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 14 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 5 MB | 62 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Vixen Co.,Ltd.](https://appshunter.io/developer/536188843) | [NIKI TECH](https://appshunter.io/developer/1788609104) |

## What reviewers say

### Solar Book

[App page](https://appshunter.io/ios/app/solar-book/id1078873201)

This app provides detailed information about solar eclipses, including timings for different phases based on your location. It allows you to view sequential images and star charts for planning and observation.

**Highlights:** Solar eclipse phase timing, Location-based eclipse calculations, Sequential eclipse image display, Star chart visualization, Past and future eclipse planning

**In-app purchases:** none


### 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 Solar Book free?

Solar Book is free to download, with no in-app purchases.

### Is Solar System&Celestial Objects free?

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

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

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

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

Solar Book ships an update every 14 months, and Solar System&Celestial Objects every 6 weeks. Most recently, Solar Book was updated on October 3, 2026 and Solar System&Celestial Objects on October 2, 2026.

---

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