# Dr. DE vs Driller's Method Worksheets

The clearest difference is price: Dr. DE at Free against Driller's Method Worksheets's $19.99. Dr. DE also leads on device support (3 vs 1). On update cadence, ads, in-app purchases and iOS requirement there is nothing between them.

Dr. DE is free to download; Driller's Method Worksheets costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Dr. DE ships an update every 3 months, Driller's Method Worksheets every 4 months. The most recent releases landed on October 24, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Dr. DE | Driller's Method Worksheets |
| --- | --- | --- |
| Price | **Free** | $19.99 |
| Rating | **[4.5 (15 ratings)](https://appshunter.io/ios/app/dr-de/id954796004/reviews)** | — |
| Number of ratings | **15** | — |
| Positive reviews | 55.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free | — |
| Size | 33 MB | 10 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 17+ | 4+ |
| Developer | [Pegasus Vertex, Inc.](https://appshunter.io/developer/954796003) | [Carlos Moura](https://appshunter.io/developer/407501202) |

## 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


### Driller's Method Worksheets

[App page](https://appshunter.io/ios/app/drillers-method-worksheets/id1069961915)

**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 Driller's Method Worksheets free?

Driller's Method Worksheets costs $19.99, with no in-app purchases.

### Do Dr. DE or Driller's Method Worksheets have ads?

Neither Dr. DE nor Driller's Method Worksheets shows ads.

### Which is updated more often, Dr. DE or Driller's Method Worksheets?

Dr. DE ships an update every 3 months, and Driller's Method Worksheets every 4 months. Most recently, Dr. DE was updated on October 24, 2026 and Driller's Method Worksheets on October 12, 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.*