# OX MONTH vs Second Brain Vault

The clearest difference is ads: Second Brain Vault at none against OX MONTH's shown. OX MONTH's advantage is update cadence (every 2 days vs every 4 months) and device support (3 vs 1). On price and in-app purchases there is nothing between them.

Both are free to download. OX MONTH sells 2 in-app purchases, starting at $4.99 per month and Second Brain Vault sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

OX MONTH ships an update every 2 days, Second Brain Vault every 4 months. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | OX MONTH | Second Brain Vault |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Every 4 months |
| Size | 30 MB | 2 MB |
| Requires iOS | **14.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nawon Kyung](https://appshunter.io/developer/1896528749) | [Byoungho Kim](https://appshunter.io/developer/1888452963) |

## What reviewers say

### OX MONTH

[App page](https://appshunter.io/ios/app/ox-month/id6767996492)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OX MONTH Premium Monthly | $4.99 | per month |
| OX MONTH premium yearly | $39.99 | per year |


### Second Brain Vault

[App page](https://appshunter.io/ios/app/second-brain-vault/id6782200821)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Second Brain Vault (Lifetime) | $17.99 | one-time |


## Frequently asked questions

### Is OX MONTH free?

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

### Is Second Brain Vault free?

Second Brain Vault is free to download, with in-app purchases available.

### Do OX MONTH or Second Brain Vault have ads?

OX MONTH shows ads; Second Brain Vault does not.

### Which is updated more often, OX MONTH or Second Brain Vault?

OX MONTH ships an update every 2 days, and Second Brain Vault every 4 months. Most recently, OX MONTH was updated on October 31, 2026 and Second Brain Vault on November 5, 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.*