# Oil density vs Guide Tracker Pro

The clearest difference is in-app purchases: Guide Tracker Pro at none against Oil density's 2. Guide Tracker Pro also leads on update cadence (every 2 months vs every 47 months) and iOS requirement (15.6 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. Guide Tracker Pro asks for nothing beyond the download.

Oil density ships an update every 47 months, Guide Tracker Pro every 2 months. The most recent releases landed on September 23, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Oil density | Guide Tracker Pro |
| --- | --- | --- |
| 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 | **Every 2 months** |
| Monetization | Free | — |
| Size | 7 MB | 74 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [昆 张](https://appshunter.io/developer/517645105) | [Tamilarasan Kannan](https://appshunter.io/developer/1500116258) |

## 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 |


### Guide Tracker Pro

[App page](https://appshunter.io/ios/app/guide-tracker-pro/id6743796137)

**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 Guide Tracker Pro free?

Guide Tracker Pro is free to download, with no in-app purchases.

### Do Oil density or Guide Tracker Pro have ads?

Neither Oil density nor Guide Tracker Pro shows ads.

### Which is updated more often, Oil density or Guide Tracker Pro?

Oil density ships an update every 47 months, and Guide Tracker Pro every 2 months. Most recently, Oil density was updated on September 23, 2026 and Guide Tracker Pro on September 10, 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.*