Comparison

Petroleum VCF Basic vs Marine Survey Assistant

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Petroleum VCF Basic

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
Read full description

This app provides volume and/or densities changes calculations due to temperature and pressure changes. Calculations are for Crude Oil, Refined Products, Lube Oils, and Specialized products. Refined Products include gasolines, alkylate, naphtha, jet fuel, kerosene, diesel. Minimum data requirements are: Density (API, S.G. or kg/m3), temperature (°F) at which density was measured and pressure (PSI). A volume is not required, but if entered, the corrected volume will be calculated. The volume measurement conditions need be indicated: either at (1) the density temperature and pressure or (2) at the Alternate temperature and pressure. Volume units of measure are not required. The latest case performed is saved and can be recalled from memory. Base conditions are 60°F and 0 PSI . Based on API published correlations.

About

Marine Survey Assistant

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
Read full description

***This is a Free Offline version of Marine Survey with some Paid features but a lot of Free content and calculators. If you want to use the Full version (all included), please download Marine Survey Pro - Marine News - My Documents - MARGRAM - Contract Tracker - Trusted Crewing Companies - Draft Survey Calculator (manual / auto) - Ballast Calculator (manual / auto) - Oil Calculator (manual / auto) - Cargo Trimming Calculator (manual / auto) - Stowage Plan Calculator (auto) - ETA Calculator - Slip Calculator - Main Engine Power Calculator - Unit Converter - Humidity Calculator - List Calculator - Interpolation Calculator - Squat & UKC Calculator - Changing Draft and GM Calculator - Port Log Book - IALA Buoyage System - Country Flags - Video Courses - Theory for any crew member Marine Calculators: - Draft Survey Calculator: Manual and automatic calculation of loaded / unloaded cargo. - Ballast Calculator: Easy auto / manual calculation quantity of ballast water on board. Just add Vessel - Ballast tanks - Tank Tables and calculate quantity of ballast in tanks in a seconds - Stowage Plan Calculator: Auto calculation of cargo by holds, using SF' of cargo as well as the necessary entries in the port for arrival and departure. - Slip Calculator: Calculator for engineers. Slip of the propeller in water, i.e. the difference between the actual speed of the ship and the one it would have if the propeller didn't rotate in water, but was screwed into a solid body - Main Engine Power Calculator: Calculation of Main Engine Power for Engineers - ETA Calculator: Quick calculation of the date and time of the ship's arrival, as well as calculation of speed you have to keep to arrive at a given time - Cargo Trimming Calculator: Easy auto / manual Trimming at the end of loading. Calculation quantity of cargo to be loaded in Cargo Holds at the end of loading and get an even keel or requested trim. - Unit Convetrer: Quickly conversion of units such as Stowage Factor, Volume, Length, Speed, Temperature - Humidity Calculator: Relative Humidity Calculation. - Oil Calculator: Easy and fast manual and auto calculation of Oil and Fuel on board. - List Calculator: Calculation of heel in degrees for navigators. - Interpolation Calculator: Liner and Bilinear Calculator - Squat & UKC Calculator: Calculation of Squat and Under Keel Clearance - Changing Draft and GM Calculator: Change in ship’s draft and GM when entering water with different density. - Theory and Useful content for any crew member. Crewing Companies: - Application Form sending - Brief Company information page - Vacancies for seamen Partners: - Video Cources for seafarers Marine News: - All important news for seamen - Always be aware of what is happening at sea Weather Condition: - Weather tracking at sea (material from open source PassageWeather) My Documents: Keep all your Marine Documents in one place - Unlimited Documents - Upload pdf and images - 3 month notification before expiry date Port Log Book: - Fast entries in Port - Entries for mooring / unmooring - Daily port entries Video Courses (Russian language): - Draft Survey - Program Draft Survey - Grain Stability Theory and Useful content: - Draft Survey - Grain Stability - Helicopter Operations - Fire Control and LSA - Medical First Aid, and more. Content will be constantly updated IALA Buoyage System: - IALA Buoyage System for Mariners - Pictures of buoys and rules - Location by regions A and B Country Flags: - Countries and their flags graphically We are constantly adding new features for your convenience.

Screenshots

Petroleum VCF Basic4 screens
Marine Survey Assistant4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
Petroleum VCF Basic versus Marine Survey Assistant: the parameters behind the verdict, then further details
ParameterPetroleum VCF BasicMarine Survey Assistant
PriceFreeFree
Rating5.0 (2 ratings) — better3.0 (2 ratings)
Positive reviews—50.0% of reviews
Number of ratings22
Update frequencyEvery 2 monthsEvery 4 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhoneiPhone, iPod — better
Requires iOS16.113.0 — better
Further details — not scored
Size2 MB143 MB
Age rating4+4+
DeveloperJose MaldonadoStanislav Soroka

Customer experience

Petroleum VCF Basic

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Marine Survey Assistant

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews4 reviews
Positive50.0%
Neutral25.0%
Negative25.0%

In-app purchases

None

Petroleum VCF Basic

No in-app purchases

9 purchases

Marine Survey Assistant

One-time9
  • Remove Ads$4.99
  • Squat & UKC Calculator$5.99
  • ME Power Calculator$6.99
Show 6 more
  • Draft & GM Calculator$7.99
  • Video Courses$9.99
  • Ballast Calculator$14.99
  • Сargo Trimming Calculator$14.99
  • Oil Calculator$14.99
  • Draft Survey Calculator$17.99

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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