# DifCal

> DifCal (iPhone/iPad app by Sean Brennan.)

- Source: https://appshunter.io/ios/app/difcal/id898026479 (this page in markdown: same URL + `.md`)
- Developer: [Sean Brennan](https://appshunter.io/developer/898026482)
- Category: Education
- Price: $1.99
- Age rating: 4+
- Requires: iOS 12.0 · 9 MB
- Languages: American English
- Released: 2014-09-28
- Data updated: 2026-05-16
- User reviews in markdown: https://appshunter.io/ios/app/difcal/id898026479/reviews.md

## What is DifCal?

Calculate diffraction angles for a particular crystal with a defined orientation matrix.  New crystals can be added to the database.  Energy/wavelength can be changed. Currently knows about 4-circle, Z-Axis and Theta-Theta diffractometers as well as 2-circle, powder and amorphous diffraction modes.  Current crystals include silicon, diamond, GaAs, Muscovite (mica), graphite, many 3-5 and 2-6 crystals.  There are separate screens for setting the crystal (or creating a new one), defining the orientation matrix, defining the diffractometer mode, and calculating either angles, given h,k,l, or hkl given a set of angles.  With the larger screen of the iPad all the controls are visible on a single page.


## Version history (last 5 releases)

### 2.42 — 2025-12-13

Updated age ratings

### 2.41 — 2025-06-04

Update for the larger iPad and iPhone screen sizes as well as for the latest operating system.

### 2.3 — 2022-02-21

Updated for iOS 15

### 2.2.2 — 2020-12-12

Updated Privacy Policy

### 2.2 — 2020-11-16

Updated for the bigger screens now prevalent.

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| --- | --- | --- | --- |
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## More apps by Sean Brennan

- [bClk](https://appshunter.io/ios/app/bclk/id1496472095)
- [kWx](https://appshunter.io/ios/app/kwx/id1497992924)

All apps by Sean Brennan: https://appshunter.io/developer/898026482

## Related topics

[difcal](https://appshunter.io/ios/topics/difcal)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-16.*