# Gas Volume Calc vs Cementing Engineer

The clearest difference is in-app purchases: Gas Volume Calc at none against Cementing Engineer's 2. Cementing Engineer's advantage is update cadence (fortnightly vs every 61 months) and rating (5.0 vs 4.7). On price, ratings volume, 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. Gas Volume Calc asks for nothing beyond the download.

Cementing Engineer holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 3 and 4 respectively.

Gas Volume Calc ships an update every 61 months, Cementing Engineer fortnightly. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Gas Volume Calc | Cementing Engineer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (3 ratings)](https://appshunter.io/ios/app/gas-volume-calc/id1082576430/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/cementing-engineer/id6779455442/reviews)** |
| Number of ratings | 3 | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 61 months | **Fortnightly** |
| Monetization | **Free** | Subscription |
| Size | 18 MB | 18 MB |
| Requires iOS | 26.1 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kelly Gayneaux](https://appshunter.io/developer/1082576429) | [Rondo Wright](https://appshunter.io/developer/6779455444) |

## What reviewers say

### Gas Volume Calc

[App page](https://appshunter.io/ios/app/gas-volume-calc/id1082576430)

This utility estimates natural gas flow rate using standard orifice meter calculations. It's designed for field use by operators, technicians, and engineers, combining meter geometry, flowing conditions, and gas composition for quick, reliable estimates.

**Highlights:** Estimates natural gas flow rate (MCFD), Uses standard orifice meter calculations, Combines meter geometry, flowing conditions, and gas composition, Provides reliable flow estimates in seconds, Simple and dependable field workflow

**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 Gas Volume Calc free?

Gas Volume Calc is free to download, with no in-app purchases.

### Is Cementing Engineer free?

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

### Which has better reviews, Gas Volume Calc or Cementing Engineer?

Cementing Engineer is rated higher. Gas Volume Calc averages 4.7 out of 5 from 3 ratings, while Cementing Engineer averages 5.0 from 4 ratings.

### Do Gas Volume Calc or Cementing Engineer have ads?

Neither Gas Volume Calc nor Cementing Engineer shows ads.

### Which is updated more often, Gas Volume Calc or Cementing Engineer?

Gas Volume Calc ships an update every 61 months, and Cementing Engineer fortnightly. Most recently, Gas Volume Calc was updated on November 2, 2026 and Cementing Engineer on October 31, 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.*