# Messo vs Second Brain

The clearest difference is in-app purchases: Messo at none against Second Brain's 1. Messo also leads on update cadence (every 4 days vs every 3 months). Second Brain's advantage is iOS requirement (15.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. Second Brain sells 1 one-off in-app purchase. Messo asks for nothing beyond the download.

Messo ships an update every 4 days, Second Brain every 3 months. The most recent releases landed on October 9, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Messo | Second Brain |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 months |
| Size | 81 MB | 25 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Stas Morozov](https://appshunter.io/developer/541842204) | [Selahattin Bozat](https://appshunter.io/developer/1895293163) |

## What reviewers say

### Messo

[App page](https://appshunter.io/ios/app/messo-to-do-notes-tasks/id6758547513)

**Features:** macOS Compatibility

**In-app purchases:** none


### Second Brain

[App page](https://appshunter.io/ios/app/second-brain-notes-and-knowledge/id6775839727)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Second Brain Premium | $9.99 | one-time |


## Frequently asked questions

### Is Messo free?

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

### Is Second Brain free?

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

### Do Messo or Second Brain have ads?

Neither Messo nor Second Brain shows ads.

### Which is updated more often, Messo or Second Brain?

Messo ships an update every 4 days, and Second Brain every 3 months. Most recently, Messo was updated on October 9, 2026 and Second Brain on October 1, 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.*