# Density Calculator vs ENGINE SFC

The clearest difference is update cadence: ENGINE SFC at daily against Density Calculator's every 3 weeks. Density Calculator's advantage is iOS requirement (13.0 vs 15.2). 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.

Density Calculator ships an update every 3 weeks, ENGINE SFC daily. The most recent releases landed on October 3, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Density Calculator | ENGINE SFC |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Daily** |
| Size | 41 MB | 6 MB |
| Requires iOS | **13.0** | 15.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [STAGE CODING, Travnik](https://appshunter.io/developer/1637068135) | [Oleksii Nezhalskyi](https://appshunter.io/developer/1687730603) |

## What reviewers say

### Density Calculator

[App page](https://appshunter.io/ios/app/density-calculator-calcon/id1619684799)

**Features:** macOS Compatibility

**In-app purchases:** none


### ENGINE SFC

[App page](https://appshunter.io/ios/app/engine-sfc/id6469806252)

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

**In-app purchases:** none


## Frequently asked questions

### Is Density Calculator free?

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

### Is ENGINE SFC free?

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

### Do Density Calculator or ENGINE SFC have ads?

Neither Density Calculator nor ENGINE SFC shows ads.

### Which is updated more often, Density Calculator or ENGINE SFC?

Density Calculator ships an update every 3 weeks, and ENGINE SFC daily. Most recently, Density Calculator was updated on October 3, 2026 and ENGINE SFC on October 19, 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.*