# Personal Calendar vs Second Brain

The clearest difference is in-app purchases: Personal Calendar at none against Second Brain's 1. Personal Calendar also leads on update cadence (every 2 days 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. Personal Calendar asks for nothing beyond the download.

Personal Calendar ships an update every 2 days, Second Brain every 3 months. The most recent releases landed on October 3, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Personal Calendar | Second Brain |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 months |
| Size | 27 MB | 25 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yakup Keskin](https://appshunter.io/developer/1884926282) | [Selahattin Bozat](https://appshunter.io/developer/1895293163) |

## What reviewers say

### Personal Calendar

[App page](https://appshunter.io/ios/app/personal-calendar/id6762839910)

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

**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 Personal Calendar free?

Personal Calendar 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 Personal Calendar or Second Brain have ads?

Neither Personal Calendar nor Second Brain shows ads.

### Which is updated more often, Personal Calendar or Second Brain?

Personal Calendar ships an update every 2 days, and Second Brain every 3 months. Most recently, Personal Calendar was updated on October 3, 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.*