# DifCal vs Crystalz

The clearest difference is price: DifCal at Free against Crystalz's $0.99. Crystalz's advantage is update cadence (every 5 weeks vs every 15 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

DifCal is free to download; Crystalz costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DifCal ships an update every 15 months, Crystalz every 5 weeks. The most recent releases landed on October 10, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | DifCal | Crystalz |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 20.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 5 weeks** |
| Monetization | — | Paid |
| Size | 9 MB | 233 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sean Brennan](https://appshunter.io/developer/898026482) | [Jeremy Burkett](https://appshunter.io/developer/1254864326) |

## What reviewers say

### DifCal

[App page](https://appshunter.io/ios/app/difcal/id898026479)

**Features:** Vision Pro support

**In-app purchases:** none


### Crystalz

[App page](https://appshunter.io/ios/app/crystalz/id1254864327)

Visualize and understand complex crystal lattice structures with interactive 3D models. Explore all 14 Bravais lattices, rotate them from any angle, and access detailed information on cell sizes and angles. Includes special viewing modes for cubic structures.

**Highlights:** 3D crystal lattice models, 14 Bravais lattice structures, Interactive rotation and viewing, Cell size and angle information, Space filling mode, Unit cell mode

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

**In-app purchases:** none


## Frequently asked questions

### Is DifCal free?

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

### Is Crystalz free?

Crystalz costs $0.99, with no in-app purchases.

### Do DifCal or Crystalz have ads?

Neither DifCal nor Crystalz shows ads.

### Which is updated more often, DifCal or Crystalz?

DifCal ships an update every 15 months, and Crystalz every 5 weeks. Most recently, DifCal was updated on October 10, 2026 and Crystalz on October 14, 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.*