# CallOne Softphone vs Petra

The clearest difference is update cadence: Petra at every 5 weeks against CallOne Softphone's every 3 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.

CallOne Softphone ships an update every 3 months, Petra every 5 weeks. The most recent releases landed on September 21, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | CallOne Softphone | Petra |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Size | 97 MB | 9 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [CallOne GmbH](https://appshunter.io/developer/1652646749) | [Mathias Palm](https://appshunter.io/developer/894444356) |

## What reviewers say

### CallOne Softphone

[App page](https://appshunter.io/ios/app/callone-softphone/id6444151385)

**In-app purchases:** none


### Petra

[App page](https://appshunter.io/ios/app/petra-split-costs/id6740541447)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CallOne Softphone free?

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

### Is Petra free?

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

### Do CallOne Softphone or Petra have ads?

Neither CallOne Softphone nor Petra shows ads.

### Which is updated more often, CallOne Softphone or Petra?

CallOne Softphone ships an update every 3 months, and Petra every 5 weeks. Most recently, CallOne Softphone was updated on September 21, 2026 and Petra on September 11, 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.*