# Volumetric Method vs O

The clearest difference is price: O at Free against Volumetric Method's $19.99. O also leads on update cadence (every 2 weeks vs every 38 months). Volumetric Method's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement there is nothing between them.

O is free to download; Volumetric Method costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Volumetric Method ships an update every 38 months, O every 2 weeks. The most recent releases landed on September 10, 2026 and December 23, 2025 respectively.

## The numbers

| Metric | Volumetric Method | O |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 38 months | **Every 2 weeks** |
| Size | 16 MB | 52 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carlos Moura](https://appshunter.io/developer/407501202) | [O-Pitblast, Lda.](https://appshunter.io/developer/1190650181) |

## What reviewers say

### Volumetric Method

[App page](https://appshunter.io/ios/app/volumetric-method/id1067133508)

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

**In-app purchases:** none


### O

[App page](https://appshunter.io/ios/app/o/id1645853605)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Volumetric Method free?

Volumetric Method costs $19.99, with no in-app purchases.

### Is O free?

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

### Do Volumetric Method or O have ads?

O shows ads; Volumetric Method does not.

### Which is updated more often, Volumetric Method or O?

Volumetric Method ships an update every 38 months, and O every 2 weeks. Most recently, Volumetric Method was updated on September 10, 2026 and O on December 23, 2025.

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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.*