# 日本姓氏語源辞典 vs Chrono Rainbow

The clearest difference is review sentiment: Chrono Rainbow at 100% against 日本姓氏語源辞典's 0%. Chrono Rainbow also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 14 months). 日本姓氏語源辞典's advantage is in-app purchases (none vs 2) and iOS requirement (16.0 vs 18.5). On price and device support there is nothing between them.

Both are free to download. Chrono Rainbow sells 2 in-app purchases, starting at $0.29 per month. 日本姓氏語源辞典 asks for nothing beyond the download.

日本姓氏語源辞典 ships an update every 14 months, Chrono Rainbow every 2 weeks. The most recent releases landed on October 24, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | 日本姓氏語源辞典 | Chrono Rainbow |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 14 months | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 23 MB | 86 MB |
| Requires iOS | **16.0** | 18.5 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Tatsuhiko Miyabe](https://appshunter.io/developer/730295743) | [Toshiaki Nakamura](https://appshunter.io/developer/822485897) |

## What reviewers say

### 日本姓氏語源辞典

[App page](https://appshunter.io/ios/app/id1471109324)

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

**In-app purchases:** none


### Chrono Rainbow

[App page](https://appshunter.io/ios/app/chrono-rainbow/id6739449092)

This app visualizes your time with both Western and Japanese calendars, allowing you to register special dates and track yearly progress. It offers customizable themes and integrates traditional Japanese seasonal markers.

**Highlights:** Western and Japanese calendar display, Anniversary and birthday registration, Japanese seasonal markers, Yearly progress visualization, Customizable themes, Traditional Japanese colors

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chrono Colors Plan 1 month | $0.29 | per month |
| Chrono Colors Plan 1 year | $2.99 | per year |


## Frequently asked questions

### Is 日本姓氏語源辞典 free?

日本姓氏語源辞典 is free to download, with no in-app purchases.

### Is Chrono Rainbow free?

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

### Do 日本姓氏語源辞典 or Chrono Rainbow have ads?

日本姓氏語源辞典 shows ads; Chrono Rainbow does not.

### Which is updated more often, 日本姓氏語源辞典 or Chrono Rainbow?

日本姓氏語源辞典 ships an update every 14 months, and Chrono Rainbow every 2 weeks. Most recently, 日本姓氏語源辞典 was updated on October 24, 2026 and Chrono Rainbow on October 19, 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.*