# Dr. DE vs DDToolsPro

The clearest difference is price: Dr. DE at Free against DDToolsPro's $9.99. Dr. DE also leads on in-app purchases (none vs 2) and iOS requirement (15.6 vs 18.2). On update cadence, ads and device support there is nothing between them.

Dr. DE is free to download; DDToolsPro costs $9.99 up front. DDToolsPro sells 2 in-app purchases, starting at $12.99 per month. Dr. DE asks for nothing beyond the download.

Dr. DE ships an update every 3 months, DDToolsPro every 2 months. The most recent releases landed on July 18, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Dr. DE | DDToolsPro |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | **[4.5 (16 ratings)](https://appshunter.io/ios/app/dr-de/id954796004/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 55.6% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 33 MB | 8 MB |
| Requires iOS | **15.6** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Pegasus Vertex, Inc.](https://appshunter.io/developer/954796003) | [Michael Blake](https://appshunter.io/developer/1443250004) |

## 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


### DDToolsPro

[App page](https://appshunter.io/ios/app/ddtoolspro/id6755078356)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DD Tools Pro Unlock - Monthly | $12.99 | per month |
| DD Tools Pro Unlock - Annual | $129.99 | per year |


## Frequently asked questions

### Is Dr. DE free?

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

### Is DDToolsPro free?

DDToolsPro costs $9.99, and also offers in-app purchases.

### Do Dr. DE or DDToolsPro have ads?

Neither Dr. DE nor DDToolsPro shows ads.

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

Dr. DE ships an update every 3 months, and DDToolsPro every 2 months. Most recently, Dr. DE was updated on July 18, 2026 and DDToolsPro on September 14, 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.*