# Pure NMR vs Crys

The clearest difference is update cadence: Crys at every 4 days against Pure NMR's every 8 months. Crys also leads on iOS requirement (17.0 vs 26.1). 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.

Pure NMR ships an update every 8 months, Crys every 4 days. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Pure NMR | Crys |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/crys-cast/id6784123301/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 4 days** |
| Monetization | — | Free |
| Size | 5 MB | 8 MB |
| Requires iOS | 26.1 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Marcal Casas Cartagena](https://appshunter.io/developer/468150889) | [子铭 叶](https://appshunter.io/developer/6784052907) |

## What reviewers say

### Pure NMR

[App page](https://appshunter.io/ios/app/pure-nmr/id482490330)

**In-app purchases:** none


### Crys

[App page](https://appshunter.io/ios/app/crys-cast/id6784123301)

This app allows users to view and analyze crystal structures locally on their mobile devices. It supports various file formats and offers tools for inspecting atoms, bonds, and unit cells, with features for generating simulated PXRD patterns and morphology previews.

**Highlights:** Local structure viewing, Supports CIF, XYZ, PDB, MOL, SDF, MOL2, RES files, Inspect atoms, bonds, unit cells, Display styles and scope control, Fullscreen and PXRD presentation modes, Simulated PXRD pattern generation, BFDH morphology preview

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

**In-app purchases:** none


## Frequently asked questions

### Is Pure NMR free?

Pure NMR is free to download, with no in-app purchases.

### Is Crys free?

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

### Do Pure NMR or Crys have ads?

Neither Pure NMR nor Crys shows ads.

### Which is updated more often, Pure NMR or Crys?

Pure NMR ships an update every 8 months, and Crys every 4 days. Most recently, Pure NMR was updated on November 1, 2026 and Crys on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*