# Birthdays vs Zettelkasten

The clearest difference is in-app purchases: Birthdays at none against Zettelkasten's 2. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Zettelkasten sells 2 in-app purchases, starting at $9.99 per 7 days. Birthdays asks for nothing beyond the download.

## The numbers

| Metric | Birthdays | Zettelkasten |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Monthly |
| Size | 4 MB | 6 MB |
| Requires iOS | **16.2** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [JEANLOUIS REBELLO](https://appshunter.io/developer/1736243366) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### Birthdays

[App page](https://appshunter.io/ios/app/birthdays/id6481118390)

**Features:** macOS Compatibility

**In-app purchases:** none


### Zettelkasten

[App page](https://appshunter.io/ios/app/zettelkasten-notes-graph/id6771281468)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $9.99 | per 7 days |
| Yearly | $49.99 | per year |


## Frequently asked questions

### Is Birthdays free?

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

### Is Zettelkasten free?

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

### Do Birthdays or Zettelkasten have ads?

Neither Birthdays nor Zettelkasten shows ads.

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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.*