# Calcul Volume Pro vs ObrIA

The clearest difference is in-app purchases: ObrIA at none against Calcul Volume Pro's 1. ObrIA also leads on device support. On price and iOS requirement there is nothing between them.

Both are free to download. Calcul Volume Pro sells 1 one-off in-app purchase. ObrIA asks for nothing beyond the download.

## The numbers

| Metric | Calcul Volume Pro | ObrIA |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | — | No |
| Update frequency | — | Every 4 months |
| Size | 37 MB | 23 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nicolas Ferrante](https://appshunter.io/developer/1889615188) | [Nicolas Armanini](https://appshunter.io/developer/6776170741) |

## What reviewers say

### Calcul Volume Pro

[App page](https://appshunter.io/ios/app/calcul-volume-pro/id6761436700)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Accès Pro | $4.99 | one-time |


### ObrIA

[App page](https://appshunter.io/ios/app/obria/id6781440325)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calcul Volume Pro free?

Calcul Volume Pro is free to download, with in-app purchases available.

### Is ObrIA free?

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

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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.*