# Aether vs Zettelkasten

The clearest difference is in-app purchases: Aether at none against Zettelkasten's 2. Aether also leads on update cadence (weekly vs monthly) and device support (3 vs 1). On price and ads there is nothing between them.

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

Aether ships an update weekly, Zettelkasten monthly. The most recent releases landed on September 18, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Aether | Zettelkasten |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Monthly |
| Size | 18 MB | 6 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Critical Dynamics OU](https://appshunter.io/developer/330152929) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### Aether

[App page](https://appshunter.io/ios/app/aether-knowledge-engine/id6761418802)

**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 Aether free?

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

### Is Zettelkasten free?

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

### Do Aether or Zettelkasten have ads?

Neither Aether nor Zettelkasten shows ads.

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

Aether ships an update weekly, and Zettelkasten monthly. Most recently, Aether was updated on September 18, 2026 and Zettelkasten on September 8, 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.*