# Dr. DE vs Kyanite Pro

The clearest difference is rating: Kyanite Pro at 5.0 against Dr. DE's 4.5. Kyanite Pro also leads on update cadence (every 8 days vs every 3 months). Dr. DE's advantage is in-app purchases (none vs 7) and ratings volume (15 vs 2). On price, ads and device support there is nothing between them.

Both are free to download. Kyanite Pro sells 7 in-app purchases, starting at $9.99 per month. Dr. DE asks for nothing beyond the download.

Kyanite Pro holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Dr. DE has 15 ratings behind it against 2, so its average is the more settled of the two.

Dr. DE ships an update every 3 months, Kyanite Pro every 8 days. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Dr. DE | Kyanite Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (15 ratings)](https://appshunter.io/ios/app/dr-de/id954796004/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/kyanite-pro/id6802395850/reviews)** |
| Number of ratings | **15** | 2 |
| Positive reviews | 55.6% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 8 days** |
| Monetization | **Free** | Freemium |
| Size | 33 MB | 30 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) | [Mike Haynes](https://appshunter.io/developer/6802395852) |

## 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


### Kyanite Pro

[App page](https://appshunter.io/ios/app/kyanite-pro/id6802395850)

This app offers a suite of offline drilling calculators and reference tools for oil and gas professionals. It includes features for mud engineers, cementers, and directional drillers, with options to share data with crews. A free tier provides basic tools, while a subscription unlocks advanced calculators and job sheets.

**Highlights:** Offline drilling calculators, Mud, cement, and directional drilling tools, Field notes and reference charts, Crew data sharing, Kill sheet and cement job sheet, Chemical inventory management

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kyanite Pro Monthly | $9.99 | per month |
| Kyanite Ultra Monthly | $20.00 | per month |
| Kyanite Pro Yearly | $50.00 | per year |
| Kyanite Ultra Yearly | $119.99 | per year |
| Starter Pack | $2.99 | one-time |
| Value Pack | $4.99 | one-time |
| Professional Pack | $9.99 | one-time |


## Frequently asked questions

### Is Dr. DE free?

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

### Is Kyanite Pro free?

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

### Which has better reviews, Dr. DE or Kyanite Pro?

Kyanite Pro is rated higher. Dr. DE averages 4.5 out of 5 from 15 ratings, while Kyanite Pro averages 5.0 from 2 ratings.

### Do Dr. DE or Kyanite Pro have ads?

Neither Dr. DE nor Kyanite Pro shows ads.

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

Dr. DE ships an update every 3 months, and Kyanite Pro every 8 days. Most recently, Dr. DE was updated on October 24, 2026 and Kyanite Pro on October 25, 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.*