# 周期カレンダー vs Source Browser for Research

The clearest difference is in-app purchases: 周期カレンダー at none against Source Browser for Research's 1. 周期カレンダー also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.2). On price, update cadence and ads there is nothing between them.

Both are free to download. Source Browser for Research sells 1 one-off in-app purchase. 周期カレンダー asks for nothing beyond the download.

周期カレンダー ships an update every 4 days, Source Browser for Research every 3 days. The most recent releases landed on October 12, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | 周期カレンダー | Source Browser for Research |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | **Every 3 days** |
| Size | 17 MB | 6 MB |
| Requires iOS | **15.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Free Canvas Co., Ltd.](https://appshunter.io/developer/658733897) | [YUKIYA SHIMODA](https://appshunter.io/developer/6804373908) |

## What reviewers say

### 周期カレンダー

[App page](https://appshunter.io/ios/app/id1619929345)

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

**In-app purchases:** none


### Source Browser for Research

[App page](https://appshunter.io/ios/app/source-browser-for-research/id6806154744)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TEXT MAP | $1.99 | one-time |


## Frequently asked questions

### Is 周期カレンダー free?

周期カレンダー is free to download, with no in-app purchases.

### Is Source Browser for Research free?

Source Browser for Research is free to download, with in-app purchases available.

### Do 周期カレンダー or Source Browser for Research have ads?

Neither 周期カレンダー nor Source Browser for Research shows ads.

### Which is updated more often, 周期カレンダー or Source Browser for Research?

周期カレンダー ships an update every 4 days, and Source Browser for Research every 3 days. Most recently, 周期カレンダー was updated on October 12, 2026 and Source Browser for Research on October 11, 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.*