# Dr. DE vs WellCalc

The clearest difference is in-app purchases: Dr. DE at none against WellCalc's 2. Dr. DE also leads on iOS requirement (15.6 vs 18.0). WellCalc's advantage is update cadence (weekly vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. WellCalc sells 2 in-app purchases, starting at $4.99 per month. Dr. DE asks for nothing beyond the download.

Dr. DE ships an update every 3 months, WellCalc weekly. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Dr. DE | WellCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (15 ratings)](https://appshunter.io/ios/app/dr-de/id954796004/reviews)** | — |
| Number of ratings | **15** | — |
| Positive reviews | 55.6% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | Free | — |
| Size | 33 MB | 13 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Pegasus Vertex, Inc.](https://appshunter.io/developer/954796003) | [Ryan Tinklepaugh](https://appshunter.io/developer/1883444651) |

## 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


### WellCalc

[App page](https://appshunter.io/ios/app/wellcalc/id6761081416)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WellCalc Pro Monthly | $4.99 | per month |
| WellCalc Pro Yearly | $29.99 | per year |


## Frequently asked questions

### Is Dr. DE free?

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

### Is WellCalc free?

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

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

Neither Dr. DE nor WellCalc shows ads.

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

Dr. DE ships an update every 3 months, and WellCalc weekly. Most recently, Dr. DE was updated on November 1, 2026 and WellCalc on October 31, 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.*