# 天文ガイド vs Solar Book

The clearest difference is in-app purchases: Solar Book at none against 天文ガイド's 39. Solar Book also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. 天文ガイド sells 39 in-app purchases, starting at $6.99 per month. Solar Book asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 14 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | 天文ガイド | Solar Book |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (4 ratings)](https://appshunter.io/ios/app/solar-book/id1078873201/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 14 months | Every 14 months |
| Monetization | — | Free |
| Size | 41 MB | 5 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Seibundo Shinkosha Publishing Co., Ltd.](https://appshunter.io/developer/513602721) | [Vixen Co.,Ltd.](https://appshunter.io/developer/536188843) |

## What reviewers say

### 天文ガイド

[App page](https://appshunter.io/ios/app/id987344209)

**In-app purchases (39)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 天文ガイド | $6.99 | per month |
| 天文ガイド | $39.99 | per 6 months |
| 天文ガイド | $79.99 | per year |
| 天文ガイド2016年11月号 | $5.99 | one-time |
| 天文ガイド2016年12月号 | $5.99 | one-time |
| 天文ガイド2019年2月号 | $5.99 | one-time |
| 天文ガイド2019年4月号 | $5.99 | one-time |
| 天文ガイド2019年10月号 | $5.99 | one-time |
| tenmonguide202606 | $6.99 | one-time |
| tenmonguide202607 | $6.99 | one-time |
| tenmonguide202602 | $6.99 | one-time |
| tenmonguide202603 | $6.99 | one-time |
| tenmonguide202601 | $6.99 | one-time |
| tenmonguide202511 | $6.99 | one-time |
| tenmonguide202512 | $6.99 | one-time |
| tenmonguide202510 | $6.99 | one-time |
| tenmonguide202509 | $6.99 | one-time |
| tenmonguide202508 | $6.99 | one-time |
| tenmonguide202507 | $6.99 | one-time |
| tenmonguide202506 | $6.99 | one-time |
| tenmonguide202504 | $6.99 | one-time |
| tenmonguide202505 | $6.99 | one-time |
| 天文ガイド2025年3月号 | $6.99 | one-time |
| 天文ガイド2025年2月号 | $6.99 | one-time |
| 天文ガイド2025年1月号 | $6.99 | one-time |
| 天文ガイド2024年11月号 | $6.99 | one-time |
| 天文ガイド2024年12月号 | $6.99 | one-time |
| 天文ガイド2023年10月号 | $7.99 | one-time |
| 天文ガイド2023年11月号 | $7.99 | one-time |
| 天文ガイド2023年12月号 | $7.99 | one-time |
| 天文ガイド2024年1月号 | $7.99 | one-time |
| 天文ガイド2024年3月号 | $7.99 | one-time |
| 天文ガイド2024年4月号 | $7.99 | one-time |
| 天文ガイド2024年10月号 | $7.99 | one-time |
| 天文ガイド2024年9月号 | $7.99 | one-time |
| 天文ガイド2024年8月号 | $7.99 | one-time |
| 天文ガイド2024年7月号 | $7.99 | one-time |
| 天文ガイド2024年5月号 | $7.99 | one-time |
| 天文ガイド2024年6月号 | $7.99 | one-time |


### 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


## Frequently asked questions

### Is 天文ガイド free?

天文ガイド is free to download, with in-app purchases available.

### Is Solar Book free?

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

### Do 天文ガイド or Solar Book have ads?

天文ガイド shows ads; Solar Book does not.

### Which is updated more often, 天文ガイド or Solar Book?

天文ガイド ships an update every 14 months, and Solar Book every 14 months. Most recently, 天文ガイド was updated on October 24, 2026 and Solar Book on October 24, 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.*