# Bragg Law — A beamline companion > Calculates diffraction angles and crystal structure properties for X-ray and neutron diffraction. (iPhone/iPad app by Jonathan Tischler.) - Source: https://appshunter.io/ios/app/bragg-law/id1608718703 (this page in markdown: same URL + `.md`) - Developer: [Jonathan Tischler](https://appshunter.io/developer/1608718705) - Category: Reference, Education - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 13.6 · 12 MB - Languages: American English - Released: 2025-04-15 - Data updated: 2026-06-04 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/bragg-law/id1608718703/reviews.md ## What is Bragg Law? This is a handy companion for people engaged in x-ray or neutron diffraction. It provides an easy way to calculate the diffraction angles or d-spacings for a crystal structure. When two of the parameters of Bragg's Law, λ = 2d sin(θ), are provided, the third is calculated. For example if you know energy and d-spacing then the angle θ is calculated. Also for the loaded crystal structure, it provides atomic positions, calculated values for the Kinematic and Dynamical Integrated Intensities, absorption factor, structure factor, and can further provide plots of the rocking curve, mirror reflectivity, F(000), µ, powder pattern, stereographic projection, Laue pattern, multiple reflections, and 3D model of the unit cell and 1st Brillouin zone. Atomic structure factors for X-rays and Neutrons are included. There is the same functionality on both iPhone and iPad. ## Key features - Calculate diffraction angles and d-spacings - Compute Kinematic and Dynamical Integrated Intensities - Generate rocking curve, mirror reflectivity, and powder pattern plots - Visualize stereographic projection, Laue pattern, and 3D unit cell models - Includes atomic structure factors for X-rays and Neutrons ## Frequently asked questions about Bragg Law ### What is Bragg Law used for? Bragg Law is used to calculate diffraction angles or d-spacings for a crystal structure when two parameters of Bragg's Law (λ = 2d sin(θ)) are known. It helps in understanding the relationship between wavelength, interplanar spacing, and diffraction angle. ### What types of plots can Bragg Law generate? Bragg Law can generate plots of the rocking curve, mirror reflectivity, F(000), µ, powder pattern, stereographic projection, Laue pattern, multiple reflections, and a 3D model of the unit cell and 1st Brillouin zone. ### Does Bragg Law support both X-rays and Neutrons? Yes, Bragg Law includes atomic structure factors for both X-rays and Neutrons, making it versatile for different types of diffraction experiments. ### What devices is Bragg Law available on? Bragg Law is available on iPhone, iPad, and iPod devices, offering the same functionality across all supported Apple platforms. ### How often is Bragg Law updated? The latest version of Bragg Law is 2.3.3, which was last updated on November 18, 2025. This indicates a recent update, suggesting active development and maintenance. ### What is the age rating for Bragg Law? Bragg Law has an age rating of 4+, making it suitable for a wide audience, including younger users interested in scientific applications. ### Does Bragg Law have ads? No, Bragg Law does not contain advertisements. It is a free application that provides its full functionality without interruption from ads. ### What is the user rating for Bragg Law? Bragg Law has an exceptional rating of 5.0 stars based on 1 review, indicating a very positive user experience among its current users. ## Version history (last 5 releases) ### 2.3.3 — 2025-11-18 Improved interpretation of chemical formulas when specifying an Absorber, also better handling of alloys with weight percents and isotope mixtures. Cleaned up some interface issues, and some small internal issues. Reordered the tab bar to make finding the Load/Save easier change Version & Build 2.3.2 --> 2.3.3 on November 18, 2025 2:00pm (EDT) hash dbaf52a iOS ### 2.3.2 — 2025-10-14 Added support for non-crystalline absorbers. It provides calculations and plots of I/Io and µ for a set of built-in absorbers and loading files of user supplied absorbers. See help for a description of this and the associated *.mtl files. and some other small upgrades. change Version & Build 2.3.1 --> 2.3.2 on September 30, 2025 5:30pm (EDT) hash 1234567 iOS ### 2.3.1 — 2025-10-01 Added support for non-crystalline absorbers. It provides calculations and plots of I/Io and µ for a set of built-in absorbers and loading files of user supplied absorbers. See help for a description of this and the associated *.mtl files. Fixed a bug when plotting rocking curve with Q on x-axis, Q was off by factors of 10 due to incorrect unit conversion. Also some improvements to other unit conversions. change Version & Build 2.2.4 --> 2.3.1 on September 30, 2025 10am (EDT) hash 9f71352 iOS ### 2.2.3 — 2025-08-13 fixed bug reading cif files containing an offset of 7/6 in the symmetry operations. A very strange thing to do. change Version & Build 2.2.2 --> 2.2.3 on July 31, 2025 8pm (EDT) hash fae7db1 iOS ### 2.2.2 — 2025-08-01 •Display Settings add another switch to show more information. •show Eω/P₀ and FWHM for multi-bounce rocking curves, hide multi-bounce curve when too small, and sometimes show ∫RⁿdE in info window. •Some plot improvements. •Added some internal xtal files, and isotope changes. •Some plot improvements and other small changes and tiny bug fixes. change Version & Build 2.2.1 --> 2.2.2 on July 31, 2025 8pm (EDT) hash 71eb4bb iOS ## Related topics [bragg law](https://appshunter.io/ios/topics/bragg-law) --- *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 2026-06-04.*