# Oxygen Cylinder Autonomy Calc vs BlueVoid

The clearest difference is price: Oxygen Cylinder Autonomy Calc at Free against BlueVoid's $9.99. Oxygen Cylinder Autonomy Calc also leads on device support (3 vs 1) and iOS requirement (9.2 vs 17.0). BlueVoid's advantage is update cadence (every 2 days vs every 2 months) and chart position (#144 vs unranked). On ads and in-app purchases there is nothing between them.

Oxygen Cylinder Autonomy Calc is free to download; BlueVoid costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Oxygen Cylinder Autonomy Calc ships an update every 2 months, BlueVoid every 2 days. The most recent releases landed on October 17, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Oxygen Cylinder Autonomy Calc | BlueVoid |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Best chart rank | — | **#144** |
| Size | 16 MB | 27 MB |
| Requires iOS | **9.2** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [DIGITAL IDEATORS INNOVATIONS SRL](https://appshunter.io/developer/1417180570) | [Bonomodo Ltd](https://appshunter.io/developer/6783131374) |

## What reviewers say

### Oxygen Cylinder Autonomy Calc

[App page](https://appshunter.io/ios/app/oxygen-cylinder-autonomy-calc/id1257704597)

**Features:** macOS Compatibility

**In-app purchases:** none


### BlueVoid

[App page](https://appshunter.io/ios/app/bluevoid/id6783131372)

**Currently charting:** #144 Top Paid · Sports (US App Store)

**In-app purchases:** none


## Frequently asked questions

### Is Oxygen Cylinder Autonomy Calc free?

Oxygen Cylinder Autonomy Calc is free to download, with no in-app purchases.

### Is BlueVoid free?

BlueVoid costs $9.99, with no in-app purchases.

### Do Oxygen Cylinder Autonomy Calc or BlueVoid have ads?

Neither Oxygen Cylinder Autonomy Calc nor BlueVoid shows ads.

### Which is updated more often, Oxygen Cylinder Autonomy Calc or BlueVoid?

Oxygen Cylinder Autonomy Calc ships an update every 2 months, and BlueVoid every 2 days. Most recently, Oxygen Cylinder Autonomy Calc was updated on October 17, 2026 and BlueVoid on October 25, 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.*