# O2 Duration vs 3DPrinter Cost Calculator

The clearest difference is price: 3DPrinter Cost Calculator at Free against O2 Duration's $2.99. 3DPrinter Cost Calculator also leads on rating (2.0 vs 1.0) and update cadence (every 2 months vs every 15 months). O2 Duration's advantage is in-app purchases (none vs 2) and iOS requirement (7.0 vs 17.6). On review sentiment, ratings volume, ads and device support there is nothing between them.

3DPrinter Cost Calculator is free to download; O2 Duration costs $2.99 up front. 3DPrinter Cost Calculator sells 2 one-off in-app purchases. O2 Duration asks for nothing beyond the download.

3DPrinter Cost Calculator holds the better App Store score, 2.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews split almost evenly too, at 0% and 0% positive.

O2 Duration ships an update every 15 months, 3DPrinter Cost Calculator every 2 months. The most recent releases landed on October 15, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | O2 Duration | 3DPrinter Cost Calculator |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/o2-duration/id556420187/reviews) | **[2.0 (2 ratings)](https://appshunter.io/ios/app/3dprinter-cost-calculator/id6757280580/reviews)** |
| Number of ratings | 1 | **2** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 2 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 17 MB |
| Requires iOS | **7.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Advanced Aviation LLC](https://appshunter.io/developer/540245667) | [Jay ortiz](https://appshunter.io/developer/1028893311) |

## 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


### 3DPrinter Cost Calculator

[App page](https://appshunter.io/ios/app/3dprinter-cost-calculator/id6757280580)

This app helps 3D printing enthusiasts and businesses accurately calculate the cost of their prints. It factors in material, electricity, depreciation, and labor to provide instant quotes and profit margins.

**Highlights:** Accurate cost estimation, Factor in electricity and depreciation, Track labor and slicing time, Set desired profit margins, Supports PLA, PETG, ABS, and Resin

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| pro yearly | $4.99 | one-time |
| pro lifetime | $19.99 | one-time |


## Frequently asked questions

### Is O2 Duration free?

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

### Is 3DPrinter Cost Calculator free?

3DPrinter Cost Calculator is free to download, with in-app purchases available.

### Which has better reviews, O2 Duration or 3DPrinter Cost Calculator?

3DPrinter Cost Calculator is rated higher. O2 Duration averages 1.0 out of 5 from 1 ratings, while 3DPrinter Cost Calculator averages 2.0 from 2 ratings.

### Do O2 Duration or 3DPrinter Cost Calculator have ads?

Neither O2 Duration nor 3DPrinter Cost Calculator shows ads.

### Which is updated more often, O2 Duration or 3DPrinter Cost Calculator?

O2 Duration ships an update every 15 months, and 3DPrinter Cost Calculator every 2 months. Most recently, O2 Duration was updated on October 15, 2026 and 3DPrinter Cost Calculator on October 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*