# Dr. DE vs Drillstring Toolbox

The clearest difference is review sentiment: Drillstring Toolbox at 100% against Dr. DE's 56%. Dr. DE's advantage is rating (4.5 vs 3.3) and update cadence (every 3 months vs every 39 months). 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.

Dr. DE holds the better App Store score, 4.5 against 3.3. 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 100% of Drillstring Toolbox'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, Drillstring Toolbox every 39 months. The most recent releases landed on July 18, 2026 and September 5, 2026 respectively.

## The numbers

| Metric | Dr. DE | Drillstring Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (16 ratings)](https://appshunter.io/ios/app/dr-de/id954796004/reviews)** | [3.3 (3 ratings)](https://appshunter.io/ios/app/drillstring-toolbox/id1068605189/reviews) |
| Number of ratings | **16** | 3 |
| Positive reviews | 55.6% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 39 months |
| Monetization | Free | Free |
| Size | 33 MB | 1 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Pegasus Vertex, Inc.](https://appshunter.io/developer/954796003) | [Bureau Veritas North America, Inc.](https://appshunter.io/developer/1770295442) |

## 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


### Drillstring Toolbox

[App page](https://appshunter.io/ios/app/drillstring-toolbox/id1068605189)

This utility app calculates drill-stem load capacities based on API connections and sizes. It also provides makeup torque and tensile capacity, as well as tensile and torsion capacities for drill pipe tubes.

**Highlights:** Drill-stem load capacity calculation, API connection selection, Makeup torque calculation, Tensile capacity calculation, Drill pipe tube capacities

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Dr. DE free?

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

### Is Drillstring Toolbox free?

Drillstring Toolbox is free to download, with no in-app purchases.

### Which has better reviews, Dr. DE or Drillstring Toolbox?

Dr. DE is rated higher. Dr. DE averages 4.5 out of 5 from 16 ratings, while Drillstring Toolbox averages 3.3 from 3 ratings.

### Do Dr. DE or Drillstring Toolbox have ads?

Neither Dr. DE nor Drillstring Toolbox shows ads.

### Which is updated more often, Dr. DE or Drillstring Toolbox?

Dr. DE ships an update every 3 months, and Drillstring Toolbox every 39 months. Most recently, Dr. DE was updated on July 18, 2026 and Drillstring Toolbox on September 5, 2026.

---

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