# Second Brain vs CellNotes

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

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

Second Brain ships an update every 3 months, CellNotes every 3 weeks. The most recent releases landed on October 1, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Second Brain | CellNotes |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Size | 25 MB | 31 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Selahattin Bozat](https://appshunter.io/developer/1895293163) | [Takafumi Terasaki](https://appshunter.io/developer/6785186297) |

## What reviewers say

### 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 |


### CellNotes

[App page](https://appshunter.io/ios/app/cellnotes/id6785186295)

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

**In-app purchases:** none


## Frequently asked questions

### Is Second Brain free?

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

### Is CellNotes free?

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

### Do Second Brain or CellNotes have ads?

Neither Second Brain nor CellNotes shows ads.

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

Second Brain ships an update every 3 months, and CellNotes every 3 weeks. Most recently, Second Brain was updated on October 1, 2026 and CellNotes on September 20, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*