# STS Leonardo vs SIDE Preventivi

The clearest difference is ads: STS Leonardo at none against SIDE Preventivi's shown. STS Leonardo also leads on update cadence (every 3 weeks vs every 6 months). SIDE Preventivi's advantage is iOS requirement (13.0 vs 15.6). On price, 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.

STS Leonardo ships an update every 3 weeks, SIDE Preventivi every 6 months. The most recent releases landed on September 9, 2026 and July 16, 2026 respectively.

## The numbers

| Metric | STS Leonardo | SIDE Preventivi |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 6 months |
| Size | 58 MB | 13 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [STS Elettronica Srl](https://appshunter.io/developer/1189869276) | [S.I.D.E. SPA](https://appshunter.io/developer/1805799570) |

## What reviewers say

### STS Leonardo

[App page](https://appshunter.io/ios/app/sts-leonardo/id6608973345)

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

**In-app purchases:** none


### SIDE Preventivi

[App page](https://appshunter.io/ios/app/side-preventivi/id6744056762)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is STS Leonardo free?

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

### Is SIDE Preventivi free?

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

### Do STS Leonardo or SIDE Preventivi have ads?

SIDE Preventivi shows ads; STS Leonardo does not.

### Which is updated more often, STS Leonardo or SIDE Preventivi?

STS Leonardo ships an update every 3 weeks, and SIDE Preventivi every 6 months. Most recently, STS Leonardo was updated on September 9, 2026 and SIDE Preventivi on July 16, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*