# 天文ガイド vs Cometarium コメタリウム

The clearest difference is in-app purchases: Cometarium コメタリウム at none against 天文ガイド's 39. Cometarium コメタリウム also leads on ads (none vs shown) and update cadence (every 4 days vs every 14 months). 天文ガイド's advantage is iOS requirement (13.0 vs 17.0). On price and device support 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. Cometarium コメタリウム asks for nothing beyond the download.

天文ガイド ships an update every 14 months, Cometarium コメタリウム every 4 days. The most recent releases landed on October 7, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | 天文ガイド | Cometarium コメタリウム |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 14 months | **Every 4 days** |
| Size | 41 MB | 11 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Seibundo Shinkosha Publishing Co., Ltd.](https://appshunter.io/developer/513602721) | [Shinsuke Abe](https://appshunter.io/developer/6790818921) |

## 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 |


### Cometarium コメタリウム

[App page](https://appshunter.io/ios/app/cometarium/id6801072934)

**Features:** Vision Pro support

**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 Cometarium コメタリウム free?

Cometarium コメタリウム is free to download, with no in-app purchases.

### Do 天文ガイド or Cometarium コメタリウム have ads?

天文ガイド shows ads; Cometarium コメタリウム does not.

### Which is updated more often, 天文ガイド or Cometarium コメタリウム?

天文ガイド ships an update every 14 months, and Cometarium コメタリウム every 4 days. Most recently, 天文ガイド was updated on October 7, 2026 and Cometarium コメタリウム on October 6, 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.*