Dr. DE vs DrillOut Calcs
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
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.
- Post-frac plug drill-out calculations
- Flow balance verification
- Annular velocity calculation
- Sweep efficiency assessment
- Surface return timing
- Real-time data verification
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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
Verdict
The clearest difference is review sentiment: DrillOut Calcs at 100% against Dr. DE's 56%. DrillOut Calcs also leads on rating (5.0 vs 4.5) and update cadence (every 3 weeks vs every 3 months). Dr. DE's advantage is ratings volume (15 vs 2) and iOS requirement (15.6 vs 18.5). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
DrillOut Calcs holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Dr. DE has 15 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 56% of Dr. DE's written reviews are positive against 100% of DrillOut Calcs's.
Dr. DE ships an update every 3 months, DrillOut Calcs every 3 weeks. Both last shipped on October 24, 2026.
| Parameter | Dr. DE | DrillOut Calcs |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (15 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 55.6% of reviews | 100.0% of reviews — better |
| Number of ratings | 15 — better | 2 |
| Update frequency | Every 3 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 18.5 |
| Further details — not scored | ||
| Size | 33 MB | 3 MB |
| Age rating | 17+ | 4+ |
| Developer | Pegasus Vertex, Inc. | Cody Martin |
Customer experience
Dr. DE
DrillOut Calcs
In-app purchases
Dr. DE
No in-app purchases
DrillOut Calcs
No in-app purchases
