チャットAI vs Simple Diary
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
チャットAI
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.
- Advanced AI for instant answers
- Japanese language support
- Improve writing skills
- Easy smartphone access
- AI-powered conversations
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■ なんでも答えてくれる最先端のAI ■ スマホで簡単！日本語にも対応しているので安心です ■ 話題沸騰！AIとトークができる チャットボット「Chat AI」で、AIのパワーを体験しよう！ AIの支援を借りて、すぐに正確な応答を得て、文章力を向上させましょう。 このアプリは、AIを活用したチャットアプリです。スマホで簡単に利用でき、日本語にも対応しています。人工知能がどんな質問にも答えてくれます。
Simple Diary
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Forget the pressure of writing long entries. This app makes journaling simple and fun, letting you quickly jot down a single thought, a quick feeling, or the day's highlight. It's designed to fit seamlessly into your busy life, helping you build a positive habit without the fuss. "What's on your mind today?" "How was that meeting?" "Did something make you smile?" Your one-liners become a personal timeline, a digital scrapbook of your journey. Easily look back at your entries through a clean calendar view or a simple list, and rediscover those small, significant moments that make up your unique story. It's about making mindfulness easy and accessible. If you're looking for a simple way to reflect, track your mood, or just keep a quick record of your days, the "One-Liner Journal" is perfect for you. Start capturing your story, one line at a time!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | チャットAI | Simple Diary |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 57.1% of reviews | — |
| Update frequency | Every 3 weeks — better | Every 3 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 14.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 11 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Akihiro Kokubo | Kana Uchida |
In-app purchases
チャットAI
- Premium3 Days trial$2.997 Days
Simple Diary
No in-app purchases
