# DifCal vs CrystalGen

The clearest difference is update cadence: DifCal at every 15 months against CrystalGen's every 38 months. DifCal also leads on price ($1.99 vs $2.99) and iOS requirement (12.0 vs 17.2). On ads, in-app purchases and device support there is nothing between them.

DifCal costs $1.99 and CrystalGen $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DifCal ships an update every 15 months, CrystalGen every 38 months. The most recent releases landed on September 19, 2026 and November 30, 2025 respectively.

## The numbers

| Metric | DifCal | CrystalGen |
| --- | --- | --- |
| Price | **$1.99** | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 15 months** | Every 38 months |
| Size | 9 MB | 3 MB |
| Requires iOS | **12.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sean Brennan](https://appshunter.io/developer/898026482) | [Steve Kliewer](https://appshunter.io/developer/1255655631) |

## What reviewers say

### DifCal

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

**In-app purchases:** none


### CrystalGen

[App page](https://appshunter.io/ios/app/crystalgen/id1589074466)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DifCal free?

DifCal costs $1.99, with no in-app purchases.

### Is CrystalGen free?

CrystalGen costs $2.99, with no in-app purchases.

### Do DifCal or CrystalGen have ads?

Neither DifCal nor CrystalGen shows ads.

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

DifCal ships an update every 15 months, and CrystalGen every 38 months. Most recently, DifCal was updated on September 19, 2026 and CrystalGen on November 30, 2025.

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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.*