# Libretto Scala vs SO/ Vienna

The clearest difference is update cadence: SO/ Vienna at every 9 days against Libretto Scala's monthly. On price, ads, in-app purchases and device support there is nothing between them.

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

Libretto Scala ships an update monthly, SO/ Vienna every 9 days. The most recent releases landed on October 11, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Libretto Scala | SO/ Vienna |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 9 days** |
| Size | 5 MB | 261 MB |
| Requires iOS | 14.0 | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lemon42 IT, Web und Software GmbH](https://appshunter.io/developer/794941037) | [Artefact Mixed Reality Studio OG](https://appshunter.io/developer/1480525611) |

## What reviewers say

### Libretto Scala

[App page](https://appshunter.io/ios/app/libretto-scala/id1623322004)

**Features:** macOS Compatibility

**In-app purchases:** none


### SO/ Vienna

[App page](https://appshunter.io/ios/app/so-vienna/id6738056147)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Libretto Scala free?

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

### Is SO/ Vienna free?

SO/ Vienna is free to download, with no in-app purchases.

### Do Libretto Scala or SO/ Vienna have ads?

Neither Libretto Scala nor SO/ Vienna shows ads.

### Which is updated more often, Libretto Scala or SO/ Vienna?

Libretto Scala ships an update monthly, and SO/ Vienna every 9 days. Most recently, Libretto Scala was updated on October 11, 2026 and SO/ Vienna on October 9, 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.*