# O'Nealgas Propane vs Cementing Engineer

The clearest difference is in-app purchases: O'Nealgas Propane at none against Cementing Engineer's 2. O'Nealgas Propane also leads on iOS requirement (8.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Cementing Engineer sells 2 in-app purchases, starting at $9.99 per month. O'Nealgas Propane asks for nothing beyond the download.

O'Nealgas Propane ships an update monthly, Cementing Engineer fortnightly. The most recent releases landed on September 30, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | O'Nealgas Propane | Cementing Engineer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/cementing-engineer/id6779455442/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | — | Subscription |
| Size | 96 MB | 18 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Blue Cow Software, Inc.](https://appshunter.io/developer/1352476536) | [Rondo Wright](https://appshunter.io/developer/6779455444) |

## What reviewers say

### O'Nealgas Propane

[App page](https://appshunter.io/ios/app/onealgas-propane/id1630965092)

**Features:** macOS Compatibility

**In-app purchases:** none


### Cementing Engineer

[App page](https://appshunter.io/ios/app/cementing-engineer/id6779455442)

This app is a field calculator for oilfield cementing operations. It allows users to input wellbore geometry and slurry details to get live, updated calculations for volumes, pressures, and pump schedules. The app also features a live well schematic and a tally book for saving and recalling job details.

**Highlights:** Field calculator for oilfield cementing, Live, updating calculations for volumes and pressures, Wellbore geometry and slurry stack input, Derived results with detailed math, Live well schematic, Tally Book for saving and recalling jobs, Offline functionality

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $9.99 | per month |
| Pro Annual | $79.99 | per year |


## Frequently asked questions

### Is O'Nealgas Propane free?

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

### Is Cementing Engineer free?

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

### Do O'Nealgas Propane or Cementing Engineer have ads?

Neither O'Nealgas Propane nor Cementing Engineer shows ads.

### Which is updated more often, O'Nealgas Propane or Cementing Engineer?

O'Nealgas Propane ships an update monthly, and Cementing Engineer fortnightly. Most recently, O'Nealgas Propane was updated on September 30, 2026 and Cementing Engineer 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.*