# Dr. Hahn Instructions vs CentraDesign Lite

The clearest difference is iOS requirement: CentraDesign Lite at 8.0 against Dr. Hahn Instructions's 11.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Dr. Hahn Instructions ships an update every 15 months, CentraDesign Lite every 21 months. The most recent releases landed on October 5, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Dr. Hahn Instructions | CentraDesign Lite |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/centradesign-lite/id1157895841/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 15 months** | Every 21 months |
| Monetization | — | Free |
| Size | 18 MB | 13 MB |
| Requires iOS | 11.0 | **8.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Team Stiefelhagen Werbeagentur GmbH](https://appshunter.io/developer/1031243988) | [Pegasus Vertex, Inc.](https://appshunter.io/developer/954796003) |

## What reviewers say

### Dr. Hahn Instructions

[App page](https://appshunter.io/ios/app/dr-hahn-instructions/id1147190358)

**Features:** macOS Compatibility

**In-app purchases:** none


### CentraDesign Lite

[App page](https://appshunter.io/ios/app/centradesign-lite/id1157895841)

This utility app calculates casing standoff and clearance for oil and gas wells. It considers various factors like pipe sizes, inclination, buoyancy, and side force. Users can visualize casing deflection in 2D and 3D.

**Highlights:** Bow spring and rigid centralizer database, Centralizer and casing database, Calculates casing standoff and clearance, Considers buoyancy and side force, 2D and 3D casing deflection view

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Dr. Hahn Instructions free?

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

### Is CentraDesign Lite free?

CentraDesign Lite is free to download, with no in-app purchases.

### Do Dr. Hahn Instructions or CentraDesign Lite have ads?

Neither Dr. Hahn Instructions nor CentraDesign Lite shows ads.

### Which is updated more often, Dr. Hahn Instructions or CentraDesign Lite?

Dr. Hahn Instructions ships an update every 15 months, and CentraDesign Lite every 21 months. Most recently, Dr. Hahn Instructions was updated on October 5, 2026 and CentraDesign Lite on October 20, 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.*