# ECD Calculator vs CBT Auto

The clearest difference is in-app purchases: CBT Auto at none against ECD Calculator's 2. CBT Auto also leads on iOS requirement (13.0 vs 15.1). ECD Calculator's advantage is update cadence (every 5 days vs fortnightly). On price, ads and device support there is nothing between them.

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

ECD Calculator ships an update every 5 days, CBT Auto fortnightly. Both last shipped on October 30, 2026.

## The numbers

| Metric | ECD Calculator | CBT Auto |
| --- | --- | --- |
| Price | Free | 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 | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Fortnightly |
| Monetization | Free | — |
| Size | 45 MB | 39 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Drillsoft LLC](https://appshunter.io/developer/1787962403) | [香港塞伯坦汽车科技有限公司](https://appshunter.io/developer/1840306705) |

## What reviewers say

### 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 |


### CBT Auto

[App page](https://appshunter.io/ios/app/cbt-auto/id6755667651)

**In-app purchases:** none


## Frequently asked questions

### Is ECD Calculator free?

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

### Is CBT Auto free?

CBT Auto is free to download, with no in-app purchases.

### Do ECD Calculator or CBT Auto have ads?

Neither ECD Calculator nor CBT Auto shows ads.

### Which is updated more often, ECD Calculator or CBT Auto?

ECD Calculator ships an update every 5 days, and CBT Auto fortnightly. Most recently, ECD Calculator was updated on October 30, 2026 and CBT Auto on October 30, 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.*