# O2gO2 vs Dial Timer

The clearest difference is in-app purchases: Dial Timer at none against O2gO2's 1. Dial Timer also leads on update cadence (every 3 weeks vs every 28 months). O2gO2's advantage is iOS requirement (12.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. O2gO2 sells 1 in-app purchase, starting at $2.99 per year. Dial Timer asks for nothing beyond the download.

O2gO2 ships an update every 28 months, Dial Timer every 3 weeks. The most recent releases landed on October 2, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | O2gO2 | Dial Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/o2go2/id895990670/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 2 MB | 13 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Aeronautical Data Systems Inc.](https://appshunter.io/developer/552304929) | [John Millhouse](https://appshunter.io/developer/415183789) |

## What reviewers say

### O2gO2

[App page](https://appshunter.io/ios/app/o2go2/id895990670)

This utility app converts oxygen cylinder pressure into remaining time, helping users manage their compressed gas resources. It provides visual indicators and calculates duration based on tank size, current pressure, and flow rate.

**Highlights:** Converts PSI to time remaining, Calculates duration based on tank size, pressure, and flow rate, Visual multicolored strip indicates oxygen level, Yellow and red indicators for low oxygen, Automatic reset for pressure input, Assumes consistent tank size

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| O2 Go2 Yearly Subscription | $2.99 | per year |


### Dial Timer

[App page](https://appshunter.io/ios/app/dial-timer/id1507822386)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is O2gO2 free?

O2gO2 is free to download, with in-app purchases available.

### Is Dial Timer free?

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

### Do O2gO2 or Dial Timer have ads?

Neither O2gO2 nor Dial Timer shows ads.

### Which is updated more often, O2gO2 or Dial Timer?

O2gO2 ships an update every 28 months, and Dial Timer every 3 weeks. Most recently, O2gO2 was updated on October 2, 2026 and Dial Timer on October 5, 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.*