# Chouseisan vs IKUSA

The clearest difference is in-app purchases: Chouseisan at none against IKUSA's 1. Chouseisan also leads on iOS requirement (15.6 vs 17.0). IKUSA's advantage is ads (none vs shown) and update cadence (every 2 days vs fortnightly). On price and device support there is nothing between them.

Both are free to download. IKUSA sells 1 in-app purchase, starting at $19.99 per month. Chouseisan asks for nothing beyond the download.

Chouseisan ships an update fortnightly, IKUSA every 2 days. The most recent releases landed on November 3, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Chouseisan | IKUSA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (43 ratings)](https://appshunter.io/ios/app/chouseisan/id6448971739/reviews)** | — |
| Number of ratings | **43** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 2 days** |
| Monetization | Ad-supported | — |
| Size | 99 MB | 10 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mixtend Inc.](https://appshunter.io/developer/1687241996) | [NORIAKI ASO](https://appshunter.io/developer/1895910814) |

## What reviewers say

### Chouseisan

[App page](https://appshunter.io/ios/app/chouseisan/id6448971739)

This free scheduling app simplifies event organization for both personal and professional use. Easily create event pages and share URLs with guests to coordinate schedules efficiently. It's a top scheduling service in Japan, designed for smooth itinerary planning.

**Highlights:** Streamlines event scheduling, Easy event page creation, Shareable event URLs, Suitable for private and business use, Large user base in Japan

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

**In-app purchases:** none


### IKUSA

[App page](https://appshunter.io/ios/app/ikusa/id6784800478)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム | $19.99 | per month |


## Frequently asked questions

### Is Chouseisan free?

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

### Is IKUSA free?

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

### Do Chouseisan or IKUSA have ads?

Chouseisan shows ads; IKUSA does not.

### Which is updated more often, Chouseisan or IKUSA?

Chouseisan ships an update fortnightly, and IKUSA every 2 days. Most recently, Chouseisan was updated on November 3, 2026 and IKUSA on October 25, 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.*