Comparison

Combine Fluids vs DrillOut Calcs

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

Head to head
About

Combine Fluids

This utility app helps oil and gas professionals quickly calculate fluid volume combinations. It allows users to input various fluid types and density requirements, saving different mix possibilities for specific wells.

Highlights
  • Combine up to 10 fluid types
  • Save fluid mix possibilities per well
  • Calculate volume combinations
  • Input mud density requirements
  • Supports volume limitations or not
Features
Read full description

Combine Fluids The creators of the top-rated app, Oilfield Calendar, offer a solution to another oilfield problem. Combine Fluids is designed to provide fast answers for everyday calculations. Combine Fluids, a simple to use calculator for the oil and gas professional. • Combine up to 10 different fluid types. • Save different mix possibilities for different wells. • From Mud Men to Derrick Men, anyone combining fluids will have a new favorite app. • Built by Oilfield guys for Oilfield user’s, putting out the best productivity apps in the industry. How to use Combine Fluids • Select weather you have volume limitations or not. • Enter your current or desired mud density, the mixing requirements will then be displayed for that information. • Save your parameters and create more volume combinations as needed. You’ve got your hardhat, steal toes, and safety glasses, now add Combine Fluids to the essential tools you need when working in the patch. Make your calculations easy, keep your life turning to the right. ** Feel free to drop us a line! We’re always listening to your suggestions and strive to improve our apps! If you have any feedback just contact us, support@archimedesworkshop.co ** ** Are you happy with the Combine Fluids app? We’d love to hear about it! Please take a moment to leave us a nice review, it truly helps us continue creating great tools for the industry! ** While you’re in the sharing mood, go ahead and post about it on Facebook too, Be Good!

About

DrillOut Calcs

This app offers essential calculations for oilfield professionals performing post-frac plug drill-outs. It provides quick and accurate tools to verify flow balance, annular velocity, sweep efficiency, and surface return timing in real time, designed for simplicity and speed.

Highlights
  • Post-frac plug drill-out calculations
  • Flow balance verification
  • Annular velocity calculation
  • Sweep efficiency assessment
  • Surface return timing
  • Real-time data verification
Features
Read full description

Drill-Out Calculator provides quick, accurate tools for oilfield professionals performing post-frac plug drill-outs. Built for simplicity and speed, it helps verify flow balance, annular velocity, sweep efficiency, and surface return timing in real time.

Screenshots

Combine Fluids4 screens
DrillOut Calcs4 screens

Verdict

The call

The clearest difference is price: DrillOut Calcs at Free against Combine Fluids's $0.99. DrillOut Calcs also leads on rating (5.0 vs 3.7) and review sentiment (100% vs 67%). Combine Fluids's advantage is iOS requirement (10.0 vs 18.5). On ratings volume, update cadence, ads and in-app purchases 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

DrillOut Calcs is free to download; Combine Fluids costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

DrillOut Calcs holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews point the same way: 67% of Combine Fluids's written reviews are positive against 100% of DrillOut Calcs's.

UpkeepUpdate frequency

Combine Fluids ships an update monthly, DrillOut Calcs every 3 weeks. The most recent releases landed on November 6, 2026 and November 5, 2026 respectively.

Scorecard5 real differences · 5 level
Combine Fluids versus DrillOut Calcs: the parameters behind the verdict, then further details
ParameterCombine FluidsDrillOut Calcs
Price$0.99Free — better
Rating3.7 (3 ratings)5.0 (2 ratings) — better
Positive reviews66.7% of reviews100.0% of reviews — better
Number of ratings3 — better2
Update frequencyMonthlyEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPodiPhone, iPad
Requires iOS10.0 — better18.5
Further details — not scored
Size85 MB3 MB
Age rating4+4+
DeveloperGoodStampCody Martin

Customer experience

Combine Fluids

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

DrillOut Calcs

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Combine Fluids

No in-app purchases

None

DrillOut Calcs

No in-app purchases

Questions

Is Combine Fluids free?
Combine Fluids costs $0.99, with no in-app purchases.
Is DrillOut Calcs free?
DrillOut Calcs is free to download, with no in-app purchases.
Which has better reviews, Combine Fluids or DrillOut Calcs?
DrillOut Calcs is rated higher. Combine Fluids averages 3.7 out of 5 from 3 ratings, while DrillOut Calcs averages 5.0 from 2 ratings.
Do Combine Fluids or DrillOut Calcs have ads?
Neither Combine Fluids nor DrillOut Calcs shows ads.
Which is updated more often, Combine Fluids or DrillOut Calcs?
Combine Fluids ships an update monthly, and DrillOut Calcs every 3 weeks. Most recently, Combine Fluids was updated on November 6, 2026 and DrillOut Calcs on November 5, 2026.

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