O'Nealgas Propane vs Cementing Engineer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
O'Nealgas Propane
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This is the O'Nealgas Propane App. The app allows users to view information about their account, order fuel, request service, and make payments on their account using their device. Customers create a login for this app by using an account number that they obtain from registering on our website. There is no cost or fees to register and use this app.
Cementing Engineer
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.
- 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
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Cementing Engineer is a field calculator for oilfield cementing operations, built by a cementer for cementers. The app requires an auto-renewable in-app subscription after the 7-day free trial to access the calculator, Tally Book, saved jobs, schematics, and derived cementing results. Pick the job - conductor, surface, intermediate, production, two-stage, drilling or production liner, balanced plug, kick-off plug, plug & abandon, or Bradenhead squeeze - enter the wellbore geometry and slurry stack, and every number updates live as you type. DERIVED RESULTS, SHOWN WITH THE MATH - Annular, shoe track, and displacement volumes with the capacity factors behind each number - Fluid placement tops and returns at surface - Volume calculations by slurry with sacks and totals - Pump schedule with rates and durations - Thickening time requirements - Hydrostatic, differential, lift, and bump pressures with burst limits - Mix water and total water requirements LIVE WELL SCHEMATIC A measured-depth schematic of casing, open hole, and fluid placement that redraws as the design changes, including two-stage and liner jobs. TALLY BOOK Save any job to the Tally Book: a browsable log of every well with its full design, well information, schematic, and complete derived results. Reopen any saved job straight into the calculator. WORKS IN THE FIELD Calculations run on the device, so the math works with no signal at the wellsite. Sign in with Apple or Google to keep your Tally Book synced across your devices. SUBSCRIPTION REQUIRED AFTER TRIAL Start with a 7-day free trial. After the trial, Apple automatically bills the selected plan unless canceled before renewal: $9.99/month or $79.99/year. Cancel anytime in your App Store account settings. Terms of Use: https://cement-phone-calculator.pages.dev/terms Privacy Policy: https://cement-phone-calculator.pages.dev/privacy Field estimate only - verify final volumes, pressures, and regulatory requirements before pumping.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | O'Nealgas Propane | Cementing Engineer |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (3 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Monthly | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Subscription |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 96 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Blue Cow Software, Inc. | Rondo Wright |
In-app purchases
O'Nealgas Propane
No in-app purchases
Cementing Engineer
- Pro Monthly7 Days trial$9.991 Month
- Pro Annual7 Days trial$79.991 Year
Questions
Is O'Nealgas Propane free?
Is Cementing Engineer free?
Do O'Nealgas Propane or Cementing Engineer have ads?
Which is updated more often, O'Nealgas Propane or Cementing Engineer?
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