# SISU vs Atemprotokoll

The clearest difference is in-app purchases: Atemprotokoll at none against SISU's 3. Atemprotokoll also leads on iOS requirement (15.6 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. SISU sells 3 in-app purchases, starting at $6.99 per month. Atemprotokoll asks for nothing beyond the download.

SISU ships an update fortnightly, Atemprotokoll every 10 days. The most recent releases landed on October 25, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | SISU | Atemprotokoll |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 10 days** |
| Size | 163 MB | 34 MB |
| Requires iOS | 26.0 | **15.6** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Julie Nixon](https://appshunter.io/developer/1825198116) | [Ulrich Coenen](https://appshunter.io/developer/6772607659) |

## What reviewers say

### SISU

[App page](https://appshunter.io/ios/app/sisu/id6758745440)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SISU Pro | $6.99 | per month |
| SISU Pro | $34.99 | per year |
| Sisu Pro Lifetime | $69.99 | one-time |


### Atemprotokoll

[App page](https://appshunter.io/ios/app/atemprotokoll/id6772607657)

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

**In-app purchases:** none


## Frequently asked questions

### Is SISU free?

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

### Is Atemprotokoll free?

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

### Do SISU or Atemprotokoll have ads?

Neither SISU nor Atemprotokoll shows ads.

### Which is updated more often, SISU or Atemprotokoll?

SISU ships an update fortnightly, and Atemprotokoll every 10 days. Most recently, SISU was updated on October 25, 2026 and Atemprotokoll on October 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.*