# Sinum vs Keratronik Atina

Sinum and Keratronik Atina are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 3 weeks. Both last shipped on November 3, 2026.

## The numbers

| Metric | Sinum | Keratronik Atina |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Size | 92 MB | 82 MB |
| Requires iOS | 16.4 | **15.6** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TECH Sterowniki](https://appshunter.io/developer/1155426726) | [Keratronik](https://appshunter.io/developer/794919726) |

## What reviewers say

### Sinum

[App page](https://appshunter.io/ios/app/sinum/id1598099137)

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

**In-app purchases:** none


### Keratronik Atina

[App page](https://appshunter.io/ios/app/keratronik-atina/id6443598356)

**In-app purchases:** none


## Frequently asked questions

### Is Sinum free?

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

### Is Keratronik Atina free?

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

### Do Sinum or Keratronik Atina have ads?

Neither Sinum nor Keratronik Atina shows ads.

### Which is updated more often, Sinum or Keratronik Atina?

Sinum ships an update every 3 weeks, and Keratronik Atina every 3 weeks. Most recently, Sinum was updated on November 3, 2026 and Keratronik Atina on November 3, 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.*