# Sistema 381 vs OneVoice

The clearest difference is in-app purchases: Sistema 381 at none against OneVoice's 4. OneVoice's advantage is update cadence (every 4 days vs every 6 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. OneVoice sells 4 one-off in-app purchases. Sistema 381 asks for nothing beyond the download.

Sistema 381 ships an update every 6 weeks, OneVoice every 4 days. The most recent releases landed on October 10, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Sistema 381 | OneVoice |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 4 days** |
| Size | 78 MB | 26 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [CBA Informatica srl](https://appshunter.io/developer/1512919600) | [Giuseppe Liccardi](https://appshunter.io/developer/1896563194) |

## What reviewers say

### Sistema 381

[App page](https://appshunter.io/ios/app/sistema-381/id6463131203)

**Features:** Vision Pro support

**In-app purchases:** none


### OneVoice

[App page](https://appshunter.io/ios/app/onevoice-translated-calls/id6768348708)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mini | $2.99 | one-time |
| Mini | $4.99 | one-time |
| Medium | $9.99 | one-time |
| Large | $17.99 | one-time |


## Frequently asked questions

### Is Sistema 381 free?

Sistema 381 is free to download, with no in-app purchases.

### Is OneVoice free?

OneVoice is free to download, with in-app purchases available.

### Do Sistema 381 or OneVoice have ads?

Neither Sistema 381 nor OneVoice shows ads.

### Which is updated more often, Sistema 381 or OneVoice?

Sistema 381 ships an update every 6 weeks, and OneVoice every 4 days. Most recently, Sistema 381 was updated on October 10, 2026 and OneVoice on October 13, 2026.

---

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