# OutputAI vs Zettelkasten

The clearest difference is update cadence: OutputAI at every 8 days against Zettelkasten's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. OutputAI sells 2 in-app purchases, starting at $4.99 per month and Zettelkasten sells 2 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.

OutputAI ships an update every 8 days, Zettelkasten monthly. The most recent releases landed on October 13, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | OutputAI | Zettelkasten |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/outputai/id6746968191/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Monthly |
| Monetization | Freemium | — |
| Size | 131 MB | 6 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Caleb Mesfien](https://appshunter.io/developer/1514249157) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### OutputAI

[App page](https://appshunter.io/ios/app/outputai/id6746968191)

Get instant AI-powered answers and summaries from anything on your screen. This app works with screenshots, links, and text, delivering clear explanations directly to your notifications without interrupting your workflow.

**Highlights:** Instant AI answers, On-screen content analysis, Summaries and explanations, Notification delivery, Works with screenshots, links, and text, Seamless iOS integration

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OutputAI Premium | $4.99 | per month |
| OutputAI Pro | $14.99 | per month |


### 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 OutputAI free?

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

### Is Zettelkasten free?

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

### Do OutputAI or Zettelkasten have ads?

Neither OutputAI nor Zettelkasten shows ads.

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

OutputAI ships an update every 8 days, and Zettelkasten monthly. Most recently, OutputAI was updated on October 13, 2026 and Zettelkasten on October 10, 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.*