# To vs Zettelkasten

The clearest difference is in-app purchases: To at none against Zettelkasten's 2. To also leads on update cadence (weekly vs monthly). 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. To asks for nothing beyond the download.

To ships an update weekly, Zettelkasten monthly. The most recent releases landed on September 19, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | To | Zettelkasten |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Monthly |
| Size | 11 MB | 6 MB |
| Requires iOS | 17 | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [友健 高](https://appshunter.io/developer/1871964438) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### To

[App page](https://appshunter.io/ios/app/to-do/id6758857570)

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

**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 To free?

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

### Is Zettelkasten free?

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

### Do To or Zettelkasten have ads?

Neither To nor Zettelkasten shows ads.

### Which is updated more often, To or Zettelkasten?

To ships an update weekly, and Zettelkasten monthly. Most recently, To was updated on September 19, 2026 and Zettelkasten on September 24, 2026.

---

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