# Diary Books vs Rocket Memo

Diary Books and Rocket Memo are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Diary Books sells 1 one-off in-app purchase and Rocket Memo sells 5 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 10 days. The most recent releases landed on September 22, 2026 and September 3, 2026 respectively.

## The numbers

| Metric | Diary Books | Rocket Memo |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 8.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | Every 10 days |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 6 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Alteru Inc.](https://appshunter.io/developer/434747758) | [Yoshinori Kasaya](https://appshunter.io/developer/1460652803) |

## What reviewers say

### Diary Books

[App page](https://appshunter.io/ios/app/diary-books/id353283040)

Record daily memories, thoughts, and special moments in a beautifully designed personal journal. Organize entries into distinct diary books for different life events, people, or goals. This app offers a private and simple space to capture your life stories and revisit cherished memories.

**Highlights:** Create multiple diary books, Write daily journal entries, Organize memories by year, topic, or person, Elegant diary-book design, Face ID support, Private journaling space

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Diary Books App Purchase | $4.99 | one-time |


### Rocket Memo

[App page](https://appshunter.io/ios/app/rocket-memo/id1472141702)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Rocket Pro Monthly | $0.99 | per month |
| Rocket Pro Yearly | $5.99 | per year |
| Small Coffee | $0.99 | one-time |
| Croissant & Coffee | $3.99 | one-time |
| Cake & Coffee | $9.99 | one-time |


## Frequently asked questions

### Is Diary Books free?

Diary Books is free to download, with in-app purchases available.

### Is Rocket Memo free?

Rocket Memo is free to download, with in-app purchases available.

### Do Diary Books or Rocket Memo have ads?

Neither Diary Books nor Rocket Memo shows ads.

### Which is updated more often, Diary Books or Rocket Memo?

Diary Books ships an update every 10 days, and Rocket Memo every 10 days. Most recently, Diary Books was updated on September 22, 2026 and Rocket Memo on September 3, 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.*