# Dr. DE vs DrillOut Calcs

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.

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.

## The numbers

| Metric | Dr. DE | DrillOut Calcs |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (15 ratings)](https://appshunter.io/ios/app/dr-de/id954796004/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/drillout-calcs/id6754534235/reviews)** |
| Number of ratings | **15** | 2 |
| Positive reviews | 55.6% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 33 MB | 3 MB |
| Requires iOS | **15.6** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Pegasus Vertex, Inc.](https://appshunter.io/developer/954796003) | [Cody Martin](https://appshunter.io/developer/1796736420) |

## What reviewers say

### Dr. DE

[App page](https://appshunter.io/ios/app/dr-de/id954796004)

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.

**Highlights:** 29 drilling engineering functions, 11 functional groups, Bit hydraulics calculations, Hole cleaning analysis, Well control solutions, Unit conversion tools, Tank capacity calculations

**Features:** macOS Compatibility

**In-app purchases:** none


### DrillOut Calcs

[App page](https://appshunter.io/ios/app/drillout-calcs/id6754534235)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Dr. DE free?

Dr. DE is free to download, with no in-app purchases.

### Is DrillOut Calcs free?

DrillOut Calcs is free to download, with no in-app purchases.

### Which has better reviews, Dr. DE or DrillOut Calcs?

DrillOut Calcs is rated higher. Dr. DE averages 4.5 out of 5 from 15 ratings, while DrillOut Calcs averages 5.0 from 2 ratings.

### Do Dr. DE or DrillOut Calcs have ads?

Neither Dr. DE nor DrillOut Calcs shows ads.

### Which is updated more often, Dr. DE or DrillOut Calcs?

Dr. DE ships an update every 3 months, and DrillOut Calcs every 3 weeks. Most recently, Dr. DE was updated on October 24, 2026 and DrillOut Calcs on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*