# Petroleum VCF Basic vs Marine Survey Assistant

The clearest difference is rating: Petroleum VCF Basic at 5.0 against Marine Survey Assistant's 3.0. Petroleum VCF Basic also leads on in-app purchases (none vs 9) and ads (none vs shown). Marine Survey Assistant's advantage is update cadence (every 4 weeks vs every 2 months) and iOS requirement (13.0 vs 16.1). On price, ratings volume and device support there is nothing between them.

Both are free to download. Marine Survey Assistant sells 9 one-off in-app purchases. Petroleum VCF Basic asks for nothing beyond the download.

Petroleum VCF Basic holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

Petroleum VCF Basic ships an update every 2 months, Marine Survey Assistant every 4 weeks. The most recent releases landed on June 4, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Petroleum VCF Basic | Marine Survey Assistant |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/petroleum-vcf-basic/id6475608625/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/marine-survey-assistant/id6475769290/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 2 MB | 143 MB |
| Requires iOS | 16.1 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jose Maldonado](https://appshunter.io/developer/1724473480) | [Stanislav Soroka](https://appshunter.io/developer/1701402639) |

## What reviewers say

### Petroleum VCF Basic

[App page](https://appshunter.io/ios/app/petroleum-vcf-basic/id6475608625)

Calculate volume and density changes for various petroleum products due to temperature and pressure variations. Supports crude oil, refined products, and specialized oils. Requires minimum density and temperature data, with optional volume input.

**Highlights:** Volume and density change calculations, Supports crude oil, refined products, and lube oils, Calculations based on temperature and pressure, Handles various density units, Optional volume input for corrected volume, Saves and recalls last performed calculation

**In-app purchases:** none


### Marine Survey Assistant

[App page](https://appshunter.io/ios/app/marine-survey-assistant/id6475769290)

This app offers a comprehensive suite of tools and information for marine professionals. It includes various calculators for draft, ballast, oil, and cargo, along with marine news, a port logbook, and video courses. Users can also manage documents and track contracts.

**Highlights:** Draft Survey Calculator, Ballast Calculator, Oil & Cargo Calculators, ETA & Slip Calculators, Unit Converter, Port Log Book, Marine News & Documents

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $4.99 | one-time |
| Squat & UKC Calculator | $5.99 | one-time |
| ME Power Calculator | $6.99 | one-time |
| Draft & GM Calculator | $7.99 | one-time |
| Video Courses | $9.99 | one-time |
| Ballast Calculator | $14.99 | one-time |
| Сargo Trimming Calculator | $14.99 | one-time |
| Oil Calculator | $14.99 | one-time |
| Draft Survey Calculator | $17.99 | one-time |


## Frequently asked questions

### Is Petroleum VCF Basic free?

Petroleum VCF Basic is free to download, with no in-app purchases.

### Is Marine Survey Assistant free?

Marine Survey Assistant is free to download, with in-app purchases available.

### Which has better reviews, Petroleum VCF Basic or Marine Survey Assistant?

Petroleum VCF Basic is rated higher. Petroleum VCF Basic averages 5.0 out of 5 from 2 ratings, while Marine Survey Assistant averages 3.0 from 2 ratings.

### Do Petroleum VCF Basic or Marine Survey Assistant have ads?

Marine Survey Assistant shows ads; Petroleum VCF Basic does not.

### Which is updated more often, Petroleum VCF Basic or Marine Survey Assistant?

Petroleum VCF Basic ships an update every 2 months, and Marine Survey Assistant every 4 weeks. Most recently, Petroleum VCF Basic was updated on June 4, 2026 and Marine Survey Assistant on September 12, 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.*