# MUDSheet vs ECD Calculator

The clearest difference is in-app purchases: MUDSheet at none against ECD Calculator's 2. MUDSheet also leads on iOS requirement (9.0 vs 15.1). ECD Calculator's advantage is update cadence (every 5 days vs every 2 months) and ratings volume (5 vs 1). On price, rating, ads and monetization model there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for MUDSheet against 5.0 for ECD Calculator. That said, the two scores are not equally well evidenced: ECD Calculator has 5 ratings behind it against 1, so its average is the more settled of the two.

MUDSheet ships an update every 2 months, ECD Calculator every 5 days. The most recent releases landed on September 29, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | MUDSheet | ECD Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/mudsheet/id1510513381/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/ecd-calculator/id6754762850/reviews) |
| Number of ratings | 1 | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Free | Free |
| Size | 18 MB | 45 MB |
| Requires iOS | **9.0** | 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

### MUDSheet

[App page](https://appshunter.io/ios/app/mudsheet/id1510513381)

This app provides essential calculations and data for mud engineering. It distills critical information from various engineering resources into a convenient tool for mud and drilling engineers, offering quick access to equations and chemical formulas.

**Highlights:** Essential mud engineering calculations, Quick access to drilling equations, Chemical formulas and atomic table, Unit conversion and setup exchange, Input data validation, Multiple table references

**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 MUDSheet free?

MUDSheet 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, MUDSheet or ECD Calculator?

MUDSheet and ECD Calculator are both rated 5.0 out of 5 on the App Store, from 1 and 5 ratings respectively.

### Do MUDSheet or ECD Calculator have ads?

Neither MUDSheet nor ECD Calculator shows ads.

### Which is updated more often, MUDSheet or ECD Calculator?

MUDSheet ships an update every 2 months, and ECD Calculator every 5 days. Most recently, MUDSheet was updated on September 29, 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.*