# Reading Memory vs 積DROP

The clearest difference is update cadence: 積DROP at every 9 days against Reading Memory's every 3 months. 積DROP also leads on device support (3 vs 1) and iOS requirement (15.5 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Reading Memory sells 2 in-app purchases, starting at $3.99 per month and 積DROP sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Reading Memory ships an update every 3 months, 積DROP every 9 days. The most recent releases landed on October 2, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Reading Memory | 積DROP |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | Freemium | — |
| Size | 29 MB | 57 MB |
| Requires iOS | 17.0 | **15.5** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kyoichi Taniguchi](https://appshunter.io/developer/1609440791) | [ForeGroove Inc.](https://appshunter.io/developer/1837127960) |

## What reviewers say

### Reading Memory

[App page](https://appshunter.io/ios/app/reading-memory-quiet-journal/id6751159926)

This app helps you record and deepen your reading experience through chat-based notes and AI interactions. It allows you to track reading goals, analyze habits, and revisit your thoughts on books.

**Highlights:** AI-powered chat memos, Mood tagging for emotional depth, Card-swipe review format, Smart book search and barcode scanning, Reading goal setting and habit tracking, AI summaries of chat memos, Reading statistics and analysis, Achievements and reading milestones

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| メモリープラス月額プラン | $3.99 | per month |
| メモリープラス年額プラン | $39.99 | per year |


### 積DROP

[App page](https://appshunter.io/ios/app/drop/id6781525555)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| A Small Coffee | $0.49 | one-time |
| A Light Meal | $2.99 | one-time |
| A Lunch | $5.99 | one-time |
| A Dinner Treat | $11.99 | one-time |


## Frequently asked questions

### Is Reading Memory free?

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

### Is 積DROP free?

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

### Do Reading Memory or 積DROP have ads?

Neither Reading Memory nor 積DROP shows ads.

### Which is updated more often, Reading Memory or 積DROP?

Reading Memory ships an update every 3 months, and 積DROP every 9 days. Most recently, Reading Memory was updated on October 2, 2026 and 積DROP on October 13, 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.*