# Subrain vs PomoTrain

The clearest difference is in-app purchases: Subrain at none against PomoTrain's 4. Subrain also leads on iOS requirement (12.0 vs 17.0). PomoTrain's advantage is update cadence (every 4 days vs every 9 days). On price, ads and device support there is nothing between them.

Both are free to download. PomoTrain sells 4 in-app purchases, starting at $3.99 per month. Subrain asks for nothing beyond the download.

Subrain ships an update every 9 days, PomoTrain every 4 days. The most recent releases landed on October 10, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Subrain | PomoTrain |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 4 days** |
| Monetization | Free | — |
| Size | 49 MB | 303 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jichan Hwang](https://appshunter.io/developer/1735193590) | [Tatsuya Kawauchi](https://appshunter.io/developer/1716320513) |

## What reviewers say

### Subrain

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

This app helps you remember important information and life keywords that you might otherwise forget. Designed for minimalists, it offers a simple way to capture thoughts and serve as a personal milestone.

**Highlights:** Simple note-taking, Capture life keywords, Minimalist design, Acts as a milestone, Organize notes into pages

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

**In-app purchases:** none


### PomoTrain

[App page](https://appshunter.io/ios/app/pomotrain/id6759304993)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Montyly | $3.99 | per month |
| Pro Yearly | $11.99 | per year |
| Pro Lifetime 24 | $14.99 | one-time |
| Pro Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is Subrain free?

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

### Is PomoTrain free?

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

### Do Subrain or PomoTrain have ads?

Neither Subrain nor PomoTrain shows ads.

### Which is updated more often, Subrain or PomoTrain?

Subrain ships an update every 9 days, and PomoTrain every 4 days. Most recently, Subrain was updated on October 10, 2026 and PomoTrain on October 9, 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.*