Comparison

O'Nealgas Propane vs Cementing Engineer

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

O'Nealgas Propane

Features
Read full description

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.

About

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.

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
Read full description

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

O'Nealgas Propane2 screens
Cementing Engineer4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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

Scorecard2 real differences · 8 level
O'Nealgas Propane versus Cementing Engineer: the parameters behind the verdict, then further details
ParameterO'Nealgas PropaneCementing Engineer
PriceFreeFree
Rating—5.0 (3 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—3 — better
Update frequencyMonthlyFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Subscription
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better15.0
Further details — not scored
Size96 MB18 MB
Age rating4+4+
DeveloperBlue Cow Software, Inc.Rondo Wright

In-app purchases

None

O'Nealgas Propane

No in-app purchases

2 purchases

Cementing Engineer

Subscriptions2
  • Pro Monthly7 Days trial$9.991 Month
  • Pro Annual7 Days trial$79.991 Year

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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