# Second Brain vs Zettelkasten

The clearest difference is in-app purchases: Second Brain 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. Second Brain asks for nothing beyond the download.

## The numbers

| Metric | Second Brain | Zettelkasten |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (1 ratings)](https://appshunter.io/ios/app/zettelkasten-notes-graph/id6771281468/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Monthly |
| Monetization | — | Freemium |
| Size | 21 MB | 6 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Konstantin Akushev](https://appshunter.io/developer/1879211261) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### Second Brain

[App page](https://appshunter.io/ios/app/second-brain-voice-notes/id6759515692)

**In-app purchases:** none


### Zettelkasten

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

This app creates a visual knowledge graph from your notes, allowing you to see and explore connections between ideas. It uses wiki-style linking and automatic backlinks to help you rediscover relationships and build a personal knowledge base without relying on traditional folders. Enjoy a private, ad-free experience where all your data stays on your device.

**Highlights:** Visual knowledge graph, Automatic backlinks, Wiki-style linking, Interactive orbit graph, Full-text search, Markdown export

**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 Second Brain free?

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

### Is Zettelkasten free?

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

### Do Second Brain or Zettelkasten have ads?

Neither Second Brain 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.*