# Chouseisan vs Second Brain Joiner

The clearest difference is price: Chouseisan at Free against Second Brain Joiner's $3.99. Chouseisan also leads on iOS requirement (15.6 vs 18.2). Second Brain Joiner's advantage is ads (none vs shown) and review sentiment (100% vs 75%). On update cadence, in-app purchases and device support there is nothing between them.

Chouseisan is free to download; Second Brain Joiner costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Chouseisan ships an update fortnightly, Second Brain Joiner every 3 weeks. The most recent releases landed on October 18, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Chouseisan | Second Brain Joiner |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.8 (40 ratings)](https://appshunter.io/ios/app/chouseisan/id6448971739/reviews)** | — |
| Number of ratings | **40** | — |
| Positive reviews | 75.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | **Ad-supported** | Paid |
| Size | 97 MB | 11 MB |
| Requires iOS | **15.6** | 18.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mixtend Inc.](https://appshunter.io/developer/1687241996) | [Hirofumi Inoue](https://appshunter.io/developer/1886583968) |

## What reviewers say

### Chouseisan

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

This free scheduling app simplifies organizing events for both personal and professional use. Easily create event pages and share URLs to coordinate with guests, making it a top choice for smooth itinerary planning.

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

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

**In-app purchases:** none


### Second Brain Joiner

[App page](https://appshunter.io/ios/app/second-brain-joiner/id6760870675)

This tool optimizes AI input by merging and formatting Markdown notes. It intelligently filters content, calculates optimal chunk sizes for AI context windows, and maintains original file structure for enhanced AI accuracy and security.

**Highlights:** Advanced filtering by tags and dates, High-precision token calculation, Smart chunking for AI context limits, Local-first absolute security, Folder structure maintenance, Timestamping for context

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

**In-app purchases:** none


## Frequently asked questions

### Is Chouseisan free?

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

### Is Second Brain Joiner free?

Second Brain Joiner costs $3.99, with no in-app purchases.

### Do Chouseisan or Second Brain Joiner have ads?

Chouseisan shows ads; Second Brain Joiner does not.

### Which is updated more often, Chouseisan or Second Brain Joiner?

Chouseisan ships an update fortnightly, and Second Brain Joiner every 3 weeks. Most recently, Chouseisan was updated on October 18, 2026 and Second Brain Joiner on October 8, 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.*