# Habit Builder vs Subrain

The clearest difference is in-app purchases: Subrain at none against Habit Builder's 2. Subrain also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Habit Builder sells 2 in-app purchases, starting at $3.99 per month. Subrain asks for nothing beyond the download.

Habit Builder ships an update every 10 days, Subrain every 8 days. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Habit Builder | Subrain |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 8 days** |
| Monetization | — | Free |
| Size | 1 MB | 41 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Adam Feher](https://appshunter.io/developer/1462164182) | [Jichan Hwang](https://appshunter.io/developer/1735193590) |

## What reviewers say

### Habit Builder

[App page](https://appshunter.io/ios/app/habit-builder-brick-by-brick/id6475047132)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro - Monthly | $3.99 | per month |
| Pro - Yearly | $24.99 | per year |


### 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 Habit Builder free?

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

### Is Subrain free?

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

### Do Habit Builder or Subrain have ads?

Neither Habit Builder nor Subrain shows ads.

### Which is updated more often, Habit Builder or Subrain?

Habit Builder ships an update every 10 days, and Subrain every 8 days. Most recently, Habit Builder was updated on October 25, 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.*