# O2 Duration vs 3DPCC

The clearest difference is review sentiment: 3DPCC at 100% against O2 Duration's 0%. 3DPCC also leads on price (Free vs $2.99) and rating (5.0 vs 1.0). O2 Duration's advantage is in-app purchases (none vs 3) and iOS requirement (7.0 vs 18.0). On ratings volume, ads and device support there is nothing between them.

3DPCC is free to download; O2 Duration costs $2.99 up front. 3DPCC sells 3 in-app purchases, starting at $3.99 per month. O2 Duration asks for nothing beyond the download.

3DPCC holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 0% of O2 Duration's written reviews are positive against 100% of 3DPCC's.

O2 Duration ships an update every 15 months, 3DPCC every 2 weeks. The most recent releases landed on October 15, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | O2 Duration | 3DPCC |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/o2-duration/id556420187/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/3dpcc-3d-printing-calculator/id6762140057/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 2 weeks** |
| Monetization | Paid | **Freemium** |
| Size | 1 MB | 12 MB |
| Requires iOS | **7.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Advanced Aviation LLC](https://appshunter.io/developer/540245667) | [David Chacon Fidalgo](https://appshunter.io/developer/1893106506) |

## What reviewers say

### O2 Duration

[App page](https://appshunter.io/ios/app/o2-duration/id556420187)

Calculate the approximate remaining oxygen in portable cylinders. Select your tank size, input current pressure and desired flow rate to see duration in minutes. Features a timer with alerts for low pressure.

**Highlights:** Oxygen cylinder duration calculation, Supports multiple cylinder sizes (A, B, D, E, G, H, K, M), Input current tank pressure, Input desired flow rate, Displays duration in minutes, Running timer with remaining time, Low pressure alerts (500lbs and 0lbs)

**Features:** macOS Compatibility

**In-app purchases:** none


### 3DPCC

[App page](https://appshunter.io/ios/app/3dpcc-3d-printing-calculator/id6762140057)

This app helps 3D printing businesses and hobbyists accurately calculate costs, set profitable prices, and manage inventory. It supports various materials, printers, and includes an Etsy fee calculator for precise profit margins.

**Highlights:** Calculate true per-unit costs, Smart pricing with profit margins, Save and track quotes, Filament and printer inventory management, Etsy fee calculator, Offline functionality

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Monthly | $3.99 | per month |
| PRO Annual | $24.99 | per year |
| PRO Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is O2 Duration free?

O2 Duration costs $2.99, with no in-app purchases.

### Is 3DPCC free?

3DPCC is free to download, with in-app purchases available.

### Which has better reviews, O2 Duration or 3DPCC?

3DPCC is rated higher. O2 Duration averages 1.0 out of 5 from 1 ratings, while 3DPCC averages 5.0 from 1 ratings.

### Do O2 Duration or 3DPCC have ads?

Neither O2 Duration nor 3DPCC shows ads.

### Which is updated more often, O2 Duration or 3DPCC?

O2 Duration ships an update every 15 months, and 3DPCC every 2 weeks. Most recently, O2 Duration was updated on October 15, 2026 and 3DPCC on October 21, 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.*