# 日記と体重 vs 100日ダイエットAI

The clearest difference is review sentiment: 日記と体重 at 75% against 100日ダイエットAI's 0%. 日記と体重 also leads on in-app purchases (none vs 4) and update cadence (weekly vs fortnightly). 100日ダイエットAI's advantage is price (Free vs $2.99). On ads there is nothing between them.

100日ダイエットAI is free to download; 日記と体重 costs $2.99 up front. 100日ダイエットAI sells 4 in-app purchases, starting at $5.99 per year. 日記と体重 asks for nothing beyond the download.

日記と体重 ships an update weekly, 100日ダイエットAI fortnightly. The most recent releases landed on October 17, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | 日記と体重 | 100日ダイエットAI |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Positive reviews | **75.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Fortnightly |
| Monetization | **Free** | Freemium |
| Size | 30 MB | 33 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Yuya Ohno](https://appshunter.io/developer/1757372076) | [株式会社オポチュニティ](https://appshunter.io/developer/1740927723) |

## What reviewers say

### 日記と体重

[App page](https://appshunter.io/ios/app/bmi/id6544789673)

Easily log daily entries, weight, and body fat percentage with a calendar interface. Track your progress visually with customizable graphs and review past records. Stay motivated with reminders and personalize your experience with theme colors.

**Highlights:** Calendar-based logging, Weight and body fat percentage tracking, Monthly average weight display, Customizable progress graphs, Searchable diary history, Theme color customization, Recording reminders

**Features:** macOS Compatibility

**In-app purchases:** none


### 100日ダイエットAI

[App page](https://appshunter.io/ios/app/100ai/id6739611540)

Effortlessly track your diet and health with AI-powered photo analysis. Automatically calculate calories, monitor nutritional balance, and receive personalized advice to achieve your weight goals without the hassle of manual input.

**Highlights:** AI calorie and PFC analysis from photos, Nutritional balance scoring, Daily/weekly diet and weight reports, Weight and BMI tracking with graphs, Personalized diet plans, Food item ranking, AI-driven improvement advice

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 食事改善プレミアムプラン(年額) | $5.99 | per year |
| 食事改善プレミアムプラン（年額） | $11.99 | per year |
| 食事改善プラン(永久版) | $5.99 | one-time |
| 食事改善プラン（永久版） | $14.99 | one-time |


## Frequently asked questions

### Is 日記と体重 free?

日記と体重 costs $2.99, with no in-app purchases.

### Is 100日ダイエットAI free?

100日ダイエットAI is free to download, with in-app purchases available.

### Do 日記と体重 or 100日ダイエットAI have ads?

Neither 日記と体重 nor 100日ダイエットAI shows ads.

### Which is updated more often, 日記と体重 or 100日ダイエットAI?

日記と体重 ships an update weekly, and 100日ダイエットAI fortnightly. Most recently, 日記と体重 was updated on October 17, 2026 and 100日ダイエットAI on October 5, 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.*