# Oil density vs ENGINE SFC

The clearest difference is in-app purchases: ENGINE SFC at none against Oil density's 2. ENGINE SFC also leads on update cadence (daily vs every 47 months) and iOS requirement (15.2 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Oil density sells 2 one-off in-app purchases. ENGINE SFC asks for nothing beyond the download.

Oil density ships an update every 47 months, ENGINE SFC daily. The most recent releases landed on September 23, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Oil density | ENGINE SFC |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/oil-density/id1641733273/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 47 months | **Daily** |
| Monetization | Free | — |
| Size | 7 MB | 6 MB |
| Requires iOS | 17.0 | **15.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [昆 张](https://appshunter.io/developer/517645105) | [Oleksii Nezhalskyi](https://appshunter.io/developer/1687730603) |

## What reviewers say

### Oil density

[App page](https://appshunter.io/ios/app/oil-density/id1641733273)

This tool calculates the standard density of oil products based on measured apparent density. It automatically queries density tables and computes volume correction factors for accurate standard volume and mass calculations. Improve efficiency and accuracy compared to manual methods.

**Highlights:** Calculates standard oil density, Queries petroleum density tables, Computes volume correction factor (VCF), Calculates standard volume and mass, Adheres to GB/T 1885-1998 national standard

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly card | $2.99 | one-time |
| Lifetime Card | $8.99 | one-time |


### ENGINE SFC

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Oil density free?

Oil density is free to download, with in-app purchases available.

### Is ENGINE SFC free?

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

### Do Oil density or ENGINE SFC have ads?

Neither Oil density nor ENGINE SFC shows ads.

### Which is updated more often, Oil density or ENGINE SFC?

Oil density ships an update every 47 months, and ENGINE SFC daily. Most recently, Oil density was updated on September 23, 2026 and ENGINE SFC on September 11, 2026.

---

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