# Dr. DE vs Directional Survey Methods

The clearest difference is update cadence: Dr. DE at every 3 months against Directional Survey Methods's every 50 months. Directional Survey Methods's advantage is iOS requirement (12.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Dr. DE ships an update every 3 months, Directional Survey Methods every 50 months. The most recent releases landed on July 18, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Dr. DE | Directional Survey Methods |
| --- | --- | --- |
| Price | Free | Free |
| 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 | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 50 months |
| Monetization | Free | — |
| Size | 33 MB | 7 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Pegasus Vertex, Inc.](https://appshunter.io/developer/954796003) | [Carlos Moura](https://appshunter.io/developer/407501202) |

## 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


### Directional Survey Methods

[App page](https://appshunter.io/ios/app/directional-survey-methods/id1130800392)

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

**In-app purchases:** none


## Frequently asked questions

### Is Dr. DE free?

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

### Is Directional Survey Methods free?

Directional Survey Methods is free to download, with no in-app purchases.

### Do Dr. DE or Directional Survey Methods have ads?

Neither Dr. DE nor Directional Survey Methods shows ads.

### Which is updated more often, Dr. DE or Directional Survey Methods?

Dr. DE ships an update every 3 months, and Directional Survey Methods every 50 months. Most recently, Dr. DE was updated on July 18, 2026 and Directional Survey Methods on September 15, 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.*