# ACI Sign OTP vs SIDA Drive Controller

The clearest difference is update cadence: SIDA Drive Controller at every 4 months against ACI Sign OTP's every 12 months. ACI Sign OTP's advantage is iOS requirement (13.0 vs 17.6). 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.

ACI Sign OTP ships an update every 12 months, SIDA Drive Controller every 4 months. The most recent releases landed on October 25, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | ACI Sign OTP | SIDA Drive Controller |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 4 months** |
| Size | 8 MB | 16 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ACI Informatica S.p.A.](https://appshunter.io/developer/408680677) | [Autosoft Multimedia srl](https://appshunter.io/developer/784464890) |

## What reviewers say

### ACI Sign OTP

[App page](https://appshunter.io/ios/app/aci-sign-otp/id1626986472)

**Features:** macOS Compatibility

**In-app purchases:** none


### SIDA Drive Controller

[App page](https://appshunter.io/ios/app/sida-drive-controller/id1637093133)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is ACI Sign OTP free?

ACI Sign OTP is free to download, with no in-app purchases.

### Is SIDA Drive Controller free?

SIDA Drive Controller is free to download, with no in-app purchases.

### Do ACI Sign OTP or SIDA Drive Controller have ads?

Neither ACI Sign OTP nor SIDA Drive Controller shows ads.

### Which is updated more often, ACI Sign OTP or SIDA Drive Controller?

ACI Sign OTP ships an update every 12 months, and SIDA Drive Controller every 4 months. Most recently, ACI Sign OTP was updated on October 25, 2026 and SIDA Drive Controller 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.*