# Drilling Engineering vs ECD Calculator

The clearest difference is review sentiment: ECD Calculator at 100% against Drilling Engineering's 50%. ECD Calculator also leads on rating (5.0 vs 3.8) and update cadence (every 5 days vs every 42 months). Drilling Engineering's advantage is in-app purchases (none vs 2) and ratings volume (19 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. Drilling Engineering asks for nothing beyond the download.

ECD Calculator holds the better App Store score, 5.0 against 3.8. Both are backed by a comparable volume of ratings — 19 and 5 respectively. Written reviews point the same way: 50% of Drilling Engineering's written reviews are positive against 100% of ECD Calculator's.

Drilling Engineering ships an update every 42 months, ECD Calculator every 5 days. The most recent releases landed on October 3, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Drilling Engineering | ECD Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (19 ratings)](https://appshunter.io/ios/app/drilling-engineering/id891302915/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ecd-calculator/id6754762850/reviews)** |
| Number of ratings | **19** | 5 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 42 months | **Every 5 days** |
| Monetization | Free | Free |
| Size | 8 MB | 45 MB |
| Requires iOS | **7.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [PT. Pertamina (Persero)](https://appshunter.io/developer/541838859) | [Drillsoft LLC](https://appshunter.io/developer/1787962403) |

## What reviewers say

### Drilling Engineering

[App page](https://appshunter.io/ios/app/drilling-engineering/id891302915)

This app provides essential tools for oil and gas professionals involved in drilling operations. It offers unit conversions, a comprehensive drilling calculator, API tubular data, stuck pipe problem identification, and well control calculations.

**Highlights:** Petroleum Unit Conversion, Drilling Calculator (90+ calculations), API Tubular Data, Stuck Pipe Problem Identification, Well Control Kill Sheet

**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 Drilling Engineering free?

Drilling Engineering 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, Drilling Engineering or ECD Calculator?

ECD Calculator is rated higher. Drilling Engineering averages 3.8 out of 5 from 19 ratings, while ECD Calculator averages 5.0 from 5 ratings.

### Do Drilling Engineering or ECD Calculator have ads?

Neither Drilling Engineering nor ECD Calculator shows ads.

### Which is updated more often, Drilling Engineering or ECD Calculator?

Drilling Engineering ships an update every 42 months, and ECD Calculator every 5 days. Most recently, Drilling Engineering was updated on October 3, 2026 and ECD Calculator on October 6, 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.*