# Rocket Memo vs Simple Diary

The clearest difference is in-app purchases: Simple Diary at none against Rocket Memo's 5. Simple Diary also leads on iOS requirement (16.6 vs 18.0). Rocket Memo's advantage is ads (none vs shown) and update cadence (every 10 days vs every 3 months). On price and device support there is nothing between them.

Both are free to download. Rocket Memo sells 5 in-app purchases, starting at $0.99 per month. Simple Diary asks for nothing beyond the download.

Rocket Memo ships an update every 10 days, Simple Diary every 3 months. The most recent releases landed on October 2, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Rocket Memo | Simple Diary |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 10 days** | Every 3 months |
| Monetization | Freemium | — |
| Size | 6 MB | 8 MB |
| Requires iOS | 18.0 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yoshinori Kasaya](https://appshunter.io/developer/1460652803) | [Kana Uchida](https://appshunter.io/developer/1819475901) |

## What reviewers say

### Rocket Memo

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

Capture thoughts instantly with this fast and organized notepad. Set reminders for important notes and find anything quickly with a powerful search. Designed for seamless idea management.

**Highlights:** Instant thought capture, Tag-based organization, Lightning-fast search, Note reminders, Clean editor

**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 |


### Simple Diary

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Rocket Memo free?

Rocket Memo 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 Rocket Memo or Simple Diary have ads?

Simple Diary shows ads; Rocket Memo does not.

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

Rocket Memo ships an update every 10 days, and Simple Diary every 3 months. Most recently, Rocket Memo was updated on October 2, 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.*