# Dr. DE vs ECD Calculator

The clearest difference is review sentiment: ECD Calculator at 100% against Dr. DE's 56%. ECD Calculator also leads on rating (5.0 vs 4.5) and update cadence (every 5 days vs every 3 months). Dr. DE's advantage is in-app purchases (none vs 2) and ratings volume (15 vs 5). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. ECD Calculator sells 2 one-off in-app purchases. Dr. DE asks for nothing beyond the download.

ECD Calculator holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 15 and 5 respectively. Written reviews point the same way: 56% of Dr. DE's written reviews are positive against 100% of ECD Calculator's.

Dr. DE ships an update every 3 months, ECD Calculator every 5 days. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Dr. DE | ECD Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (15 ratings)](https://appshunter.io/ios/app/dr-de/id954796004/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ecd-calculator/id6754762850/reviews)** |
| Number of ratings | **15** | 5 |
| Positive reviews | 55.6% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Monetization | Free | Free |
| Size | 33 MB | 45 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Pegasus Vertex, Inc.](https://appshunter.io/developer/954796003) | [Drillsoft LLC](https://appshunter.io/developer/1787962403) |

## 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


### ECD Calculator

[App page](https://appshunter.io/ios/app/ecd-calculator/id6754762850)

This utility app assists drilling and mud engineers in calculating Equivalent Circulating Density (ECD) at any point during operations. It offers a streamlined process with just a few clicks.

**Highlights:** ECD calculation, Drilling engineering, Mud engineering, Point-of-operation calculation, Streamlined interface

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 50 credits | $3.99 | one-time |
| 300 Credits | $9.99 | one-time |


## Frequently asked questions

### Is Dr. DE free?

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

### Is ECD Calculator free?

ECD Calculator is free to download, with in-app purchases available.

### Which has better reviews, Dr. DE or ECD Calculator?

ECD Calculator is rated higher. Dr. DE averages 4.5 out of 5 from 15 ratings, while ECD Calculator averages 5.0 from 5 ratings.

### Do Dr. DE or ECD Calculator have ads?

Neither Dr. DE nor ECD Calculator shows ads.

### Which is updated more often, Dr. DE or ECD Calculator?

Dr. DE ships an update every 3 months, and ECD Calculator every 5 days. Most recently, Dr. DE was updated on October 24, 2026 and ECD Calculator on October 6, 2026.

---

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