# SIGMA AOSTA vs ChessTools.it

The clearest difference is update cadence: ChessTools.it at every 3 days against SIGMA AOSTA's every 33 months. SIGMA AOSTA's advantage is iOS requirement (11.0 vs 17.0). On price and in-app purchases there is nothing between them.

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

SIGMA AOSTA ships an update every 33 months, ChessTools.it every 3 days. The most recent releases landed on September 24, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | SIGMA AOSTA | ChessTools.it |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | Every 33 months | **Every 3 days** |
| Size | 22 MB | 3 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | — | **iPhone** |
| Age rating | 12+ | 4+ |
| Developer | [ID&A S.r.l.](https://appshunter.io/developer/1446283055) | [Giorgio Donnoli](https://appshunter.io/developer/6777981338) |

## What reviewers say

### SIGMA AOSTA

[App page](https://appshunter.io/ios/app/sigma-aosta/id6463710239)

**In-app purchases:** none


### ChessTools.it

[App page](https://appshunter.io/ios/app/chesstoolsit/id6791041579)

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

**In-app purchases:** none


## Frequently asked questions

### Is SIGMA AOSTA free?

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

### Is ChessTools.it free?

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

### Which is updated more often, SIGMA AOSTA or ChessTools.it?

SIGMA AOSTA ships an update every 33 months, and ChessTools.it every 3 days. Most recently, SIGMA AOSTA was updated on September 24, 2026 and ChessTools.it on October 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.*