# チャットAI vs Simple Diary

The clearest difference is in-app purchases: Simple Diary at none against チャットAI's 1. チャットAI's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 3 months). On price and device support there is nothing between them.

Both are free to download. チャットAI sells 1 in-app purchase, starting at $2.99 per 7 days. Simple Diary asks for nothing beyond the download.

チャットAI ships an update every 3 weeks, Simple Diary every 3 months. The most recent releases landed on October 13, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | チャットAI | Simple Diary |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Freemium | — |
| Size | 11 MB | 8 MB |
| Requires iOS | **14.0** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Akihiro Kokubo](https://appshunter.io/developer/1485855806) | [Kana Uchida](https://appshunter.io/developer/1819475901) |

## What reviewers say

### チャットAI

[App page](https://appshunter.io/ios/app/ai-ai/id6446063282)

This AI-powered chatbot provides instant, accurate responses to any question. Easily accessible on your smartphone, it supports Japanese and helps improve your writing skills. Experience the power of AI for conversation and assistance.

**Highlights:** Advanced AI for instant answers, Japanese language support, Improve writing skills, Easy smartphone access, AI-powered conversations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $2.99 | per 7 days |


### Simple Diary

[App page](https://appshunter.io/ios/app/simple-diary-myjot/id6747032449)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is チャットAI free?

チャットAI is free to download, with in-app purchases available.

### Is Simple Diary free?

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

### Do チャットAI or Simple Diary have ads?

Simple Diary shows ads; チャットAI does not.

### Which is updated more often, チャットAI or Simple Diary?

チャットAI ships an update every 3 weeks, and Simple Diary every 3 months. Most recently, チャットAI was updated on October 13, 2026 and Simple Diary on October 6, 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.*