# Wait and Weight Method vs ECD Calculator

The clearest difference is price: ECD Calculator at Free against Wait and Weight Method's $19.99. ECD Calculator also leads on update cadence (every 5 days vs every 28 months). Wait and Weight Method's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

ECD Calculator is free to download; Wait and Weight Method costs $19.99 up front. ECD Calculator sells 2 one-off in-app purchases. Wait and Weight Method asks for nothing beyond the download.

Wait and Weight Method ships an update every 28 months, ECD Calculator every 5 days. The most recent releases landed on October 2, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Wait and Weight Method | ECD Calculator |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ecd-calculator/id6754762850/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 5 days** |
| Monetization | — | Free |
| Size | 17 MB | 45 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Carlos Moura](https://appshunter.io/developer/407501202) | [Drillsoft LLC](https://appshunter.io/developer/1787962403) |

## What reviewers say

### Wait and Weight Method

[App page](https://appshunter.io/ios/app/wait-and-weight-method/id1067063428)

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

**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 Wait and Weight Method free?

Wait and Weight Method costs $19.99, with no in-app purchases.

### Is ECD Calculator free?

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

### Do Wait and Weight Method or ECD Calculator have ads?

Neither Wait and Weight Method nor ECD Calculator shows ads.

### Which is updated more often, Wait and Weight Method or ECD Calculator?

Wait and Weight Method ships an update every 28 months, and ECD Calculator every 5 days. Most recently, Wait and Weight Method was updated on October 2, 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.*