# Rocket Memo vs Subrain

The clearest difference is in-app purchases: Subrain at none against Rocket Memo's 5. Subrain also leads on review sentiment (100% vs 80%) and iOS requirement (15.0 vs 18.0). On price, update cadence, ads 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. Subrain asks for nothing beyond the download.

Rocket Memo ships an update every 2 weeks, Subrain every 8 days. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Rocket Memo | Subrain |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 8 days** |
| Monetization | Freemium | **Free** |
| Size | 6 MB | 41 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Yoshinori Kasaya](https://appshunter.io/developer/1460652803) | [Jichan Hwang](https://appshunter.io/developer/1735193590) |

## 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 |


### Subrain

[App page](https://appshunter.io/ios/app/subrain/id6502538432)

This minimalist note-taking app helps you remember important keywords and life directions. It offers a simple interface for jotting down tasks and life-defining thoughts, acting as an extension of your memory.

**Highlights:** Simple note writing, Organized pages for notes, Minimalist interface, Acts as an extra brain, Helps remember keywords, Tracks life directions

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

**In-app purchases:** none


## Frequently asked questions

### Is Rocket Memo free?

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

### Is Subrain free?

Subrain is free to download, with no in-app purchases.

### Do Rocket Memo or Subrain have ads?

Neither Rocket Memo nor Subrain shows ads.

### Which is updated more often, Rocket Memo or Subrain?

Rocket Memo ships an update every 2 weeks, and Subrain every 8 days. Most recently, Rocket Memo was updated on October 24, 2026 and Subrain on October 30, 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.*