# OpusTel vs DUO Holding

The clearest difference is update cadence: DUO Holding at every 6 weeks against OpusTel's every 14 months. 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.

OpusTel ships an update every 14 months, DUO Holding every 6 weeks. The most recent releases landed on August 29, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | OpusTel | DUO Holding |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/opustel/id945641896/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 98 MB | 47 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [OpusTel](https://appshunter.io/developer/945641895) | [DUO Holding GmbH](https://appshunter.io/developer/1483201947) |

## What reviewers say

### OpusTel

[App page](https://appshunter.io/ios/app/opustel/id945641896)

This app provides a real Swiss international telephone number for secure VoIP calls on iOS devices. It offers HD audio quality, free global calls between users, and call recording capabilities, all with a focus on user privacy.

**Highlights:** Real Swiss international telephone number, Secure VoIP calls, HD high-definition audio quality, Free global calls between users, Call recording, Conference calls, Automatic language selection

**In-app purchases:** none


### DUO Holding

[App page](https://appshunter.io/ios/app/duo-holding/id1483448919)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OpusTel free?

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

### Is DUO Holding free?

DUO Holding is free to download, with no in-app purchases.

### Do OpusTel or DUO Holding have ads?

Neither OpusTel nor DUO Holding shows ads.

### Which is updated more often, OpusTel or DUO Holding?

OpusTel ships an update every 14 months, and DUO Holding every 6 weeks. Most recently, OpusTel was updated on August 29, 2026 and DUO Holding on September 14, 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.*