# InputSmart vs Zettelkasten

The clearest difference is in-app purchases: InputSmart at none against Zettelkasten's 2. InputSmart also leads on device support (3 vs 1) and iOS requirement (11.0 vs 17.0). Zettelkasten's advantage is update cadence (monthly vs every 5 months). 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. InputSmart asks for nothing beyond the download.

InputSmart ships an update every 5 months, Zettelkasten monthly. The most recent releases landed on October 1, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | InputSmart | Zettelkasten |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Monthly** |
| Size | 28 MB | 6 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [SPACENETWORK SOCIEDAD LIMITADA](https://appshunter.io/developer/1590561804) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### InputSmart

[App page](https://appshunter.io/ios/app/inputsmart/id1672847009)

**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 InputSmart free?

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

### Is Zettelkasten free?

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

### Do InputSmart or Zettelkasten have ads?

Neither InputSmart nor Zettelkasten shows ads.

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

InputSmart ships an update every 5 months, and Zettelkasten monthly. Most recently, InputSmart was updated on October 1, 2026 and Zettelkasten on September 24, 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.*