# Simple Moon Phase Calendar vs 河川カメラ RiverPulse

The clearest difference is update cadence: 河川カメラ RiverPulse at monthly against Simple Moon Phase Calendar's every 5 months. 河川カメラ RiverPulse also leads on iOS requirement (18.6 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Simple Moon Phase Calendar sells 2 one-off in-app purchases and 河川カメラ RiverPulse sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Simple Moon Phase Calendar ships an update every 5 months, 河川カメラ RiverPulse monthly. The most recent releases landed on September 21, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Simple Moon Phase Calendar | 河川カメラ RiverPulse |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (84 ratings)](https://appshunter.io/ios/app/simple-moon-phase-calendar/id1279710898/reviews)** | — |
| Number of ratings | **84** | — |
| Positive reviews | 65.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 36 MB | 101 MB |
| Requires iOS | 26.0 | **18.6** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Fumihiro Takahashi](https://appshunter.io/developer/1279710897) | [hidehiko aihara](https://appshunter.io/developer/1178520609) |

## What reviewers say

### Simple Moon Phase Calendar

[App page](https://appshunter.io/ios/app/simple-moon-phase-calendar/id1279710898)

A straightforward calendar app displaying detailed lunar information for each date. It includes moon phase, age, distance, illumination, zodiac sign, and rise/set times. Features a note function, widgets, and customizable notifications for key lunar events and Mercury retrograde.

**Highlights:** Moon phase and age display, Lunar distance and illumination, Moon sign and constellation, Mercury retrograde tracking, Moonrise and moonset times, Note function, Widget support, Customizable notifications

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |
| Unlock | $1.99 | one-time |


### 河川カメラ RiverPulse

[App page](https://appshunter.io/ios/app/riverpulse/id6787630906)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee (Regular) | $0.49 | one-time |
| Coffee (Large) | $1.99 | one-time |
| Cake Set | $5.99 | one-time |


## Frequently asked questions

### Is Simple Moon Phase Calendar free?

Simple Moon Phase Calendar is free to download, with in-app purchases available.

### Is 河川カメラ RiverPulse free?

河川カメラ RiverPulse is free to download, with in-app purchases available.

### Do Simple Moon Phase Calendar or 河川カメラ RiverPulse have ads?

Both Simple Moon Phase Calendar and 河川カメラ RiverPulse show ads.

### Which is updated more often, Simple Moon Phase Calendar or 河川カメラ RiverPulse?

Simple Moon Phase Calendar ships an update every 5 months, and 河川カメラ RiverPulse monthly. Most recently, Simple Moon Phase Calendar was updated on September 21, 2026 and 河川カメラ RiverPulse on September 23, 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.*