Dr. DE vs Combine Fluids
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Dr. DE
This mobile toolbox simplifies complex drilling engineering calculations. It offers a comprehensive suite of 29 functions across 11 categories, eliminating the need for handbooks and improving efficiency for engineers and technicians.
- 29 drilling engineering functions
- 11 functional groups
- Bit hydraulics calculations
- Hole cleaning analysis
- Well control solutions
- Unit conversion tools
- Tank capacity calculations
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Do you want to solve drilling engineering problems in seconds? It is easier than ever before to use Dr. DE Lite mobile app, a must-have toolbox app that includes a substantial collection of functions for every drilling engineer and technician. Bid farewell to flipping through handbooks, textbooks, standards, etc. for answers. This free app, sophisticated yet simple to use, not only saves time and money, but also makes your engineering and sales efforts more reliable and professional. The Dr. DE Lite app is equipped with 29 functions that are divided into 11 groups. --Bit Hydraulics --Casing Centralizer --Hole Cleaning --Hydraulics --Mud Additives --Pipe --Pump --Tank Capacity --Volume and Capacity --Well Control --Unit Conversion
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.
- Combine up to 10 fluid types
- Save fluid mix possibilities per well
- Calculate volume combinations
- Input mud density requirements
- Supports volume limitations or not
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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!
Screenshots
Verdict
The clearest difference is price: Dr. DE at Free against Combine Fluids's $0.99. Dr. DE also leads on rating (4.5 vs 3.7) and ratings volume (16 vs 3). Combine Fluids's advantage is update cadence (monthly vs every 3 months) and review sentiment (67% vs 56%). On ads, in-app purchases 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
Dr. DE is free to download; Combine Fluids costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Dr. DE holds the better App Store score, 4.5 against 3.7. That said, the two scores are not equally well evidenced: Dr. DE has 16 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 56% of Dr. DE's written reviews are positive against 67% of Combine Fluids's, so the app with the better star average is not the one people write more warmly about.
Dr. DE ships an update every 3 months, Combine Fluids monthly. Both last shipped on October 7, 2026.
| Parameter | Dr. DE | Combine Fluids |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.5 (16 ratings) — better | 3.7 (3 ratings) |
| Positive reviews | 55.6% of reviews | 66.7% of reviews — better |
| Number of ratings | 16 — better | 3 |
| Update frequency | Every 3 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 10.0 — better |
| Further details — not scored | ||
| Size | 33 MB | 85 MB |
| Age rating | 17+ | 4+ |
| Developer | Pegasus Vertex, Inc. | GoodStamp |
Customer experience
Dr. DE
Combine Fluids
In-app purchases
Dr. DE
No in-app purchases
Combine Fluids
No in-app purchases
Questions
Is Dr. DE free?
Is Combine Fluids free?
Which has better reviews, Dr. DE or Combine Fluids?
Do Dr. DE or Combine Fluids have ads?
Which is updated more often, Dr. DE or Combine Fluids?
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