Oilcalcs vs PSC Check
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Oilcalcs
This app provides comprehensive calculations for professionals in the oil and gas industry. It offers versatile tools for volume and weight conversions, density corrections, and blending calculations, supporting various industry tables and units.
- Volume and weight conversions
- Density correction for special applications
- Viscosity, pour point, and flash point blender
- LNG and LPG density calculators
- Support for ASTM tables and units
- Data export to database
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The most complete, flexible and versatile calculator for professionals in the oil and gas industry! Now optimized for iOS 26. Newly added features: - Calculator for Aromatics - Added the following tables to the oil conversion screen: table 4, 8, 9, 10, 11, 12, 13, 14, 52, 56, 57, 58 - Added a field for density correction in the main calculator (and quantity editor) for the calculation of special applications in case a thermal expansion coefficient is not available - Viscosity / pour point / flash point blender - LNG density calculator - Viscosity / Temperature calculator - Density data for both the LPG and LNG density calculator are stored in the phone for easy retrieval The app uses the ASTM tables / formulas to calculate weights and volumes based on entered density15, density20, relative density or API, observed volume, pressure and temperature, and calculates the following: - Volume correction factor (to number of decimals of your own choice or as set by table Version) - Metric tons (vacuum) - Metric tons (air) - GSV (M3 @15) - BBLS (@60) - Longtons - Gallons OilCalcs contains both ASTM 1980 and ASTM 2009 tables as well as the ASTM 1952 version of LPG Table 54, and users can select which table to use in the settings screen. Users can also select whether they want to calculate using SI Metric units or Imperial units. Precision for VCF, GSV, MTons, LTons and Bbls can be changed using the settings screen. Settings are saved in the app so that when you use the app next time it will calculate with your chosen settings. Densities can be entered in the following formats which are automatically recognized: e.g 0.9664 / 966.4 / 9664 The app can calculate for crude oil, black and white products, lubrication oils and special applications, and input can be changed between density in vacuum at 15 and 20 deg C/ API / relative density / observed, and degrees Celsius / Fahrenheit by touching the applicable buttons. The user has the choice to calculate using as input observed M3 / M3 at 15 / observed Barrels / Barrels 60 / Metric tons air/vac / Ltons / Gallons. The user can also calculate weights of LPG / NGL, using either density @ 15C, relative density @60F, observed density or density @ 20C. Aside from the conversion screen with conversions between API, observed density, density 15, density 20 and relative density, there is also a screen with conversions used in LPG / NGL. For products, lube oils and crude there are two tools for calculating final density when blending two components: one tool that calculates the blend after loading the 2nd component, and another tool that lets the user choose the two components and advises which component to load first, based on density 15C or API 60F and actual temperature of the components. Both tools also calculate volume shrinkage due to blending. A utility has been included that enables the user to export data from the calculator screen directly into a database for future reference. The same utility can be used to enter data manually and edit previously entered data. For a detailed tutorial please visit our webpage (http://mooringmarineconsultancy.wordpress.com). Download the manual here: https://mooringmarineconsultancy.wordpress.com/wp-content/uploads/2020/09/oilcalcs-for-iphone-user-manual.pdf
PSC Check
This app assists with pre-departure equipment checks for maritime vessels, helping to reduce the risk of inspection detentions and deficiencies. It categorizes items by location, allows for input of inspection results with notes and photos, and generates PDF reports. Users can also review statistical data on common deficiencies.
- Categorized equipment checklist by location
- Input inspection results with notes and photos
- Generate PDF reports for shore-side forwarding
- Analyze detainable deficiency statistics
- Regular updates for checklist and statistics
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ARRIVAL CHECKLIST for PSC is the preparatory onboard equipment checklist mobile app to help minimize the risk of PSC detentions and deficiencies. Key features: - The app categorizes items that are frequently pointed out as deficiency at PSC inspections by location. - Inspection results can be input into the system along with notes and photos for each corresponding checklist item. - Users have the option of creating a PDF version of the completed results, which can be forwarded shore side. - Users can also confirm the statistical data and the tendency of detainable deficiencies in across a number of major PSC areas. - Updates are available for the checklist and statistics to ensure the app has the latest PSC data.
Screenshots
Verdict
The clearest difference is price: PSC Check at Free against Oilcalcs's $9.99. PSC Check also leads on rating (5.0 vs 4.8). Oilcalcs's advantage is ratings volume (46 vs 1) and update cadence (every 4 months vs every 10 months). On ads, in-app purchases, device support and iOS requirement 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
PSC Check is free to download; Oilcalcs costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
PSC Check holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Oilcalcs has 46 ratings behind it against 1, so its average is the more settled of the two.
Oilcalcs ships an update every 4 months, PSC Check every 10 months. The most recent releases landed on October 21, 2026 and October 12, 2026 respectively.
| Parameter | Oilcalcs | PSC Check |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 4.8 (46 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 46 — better | 1 |
| Update frequency | Every 4 months — better | Every 10 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 2 MB | 27 MB |
| Age rating | 4+ | 17+ |
| Developer | ron mooring | NIPPON KAIJI KYOKAI GENERAL INCORPORATED FOUNDATION |
Customer experience
Oilcalcs
PSC Check
In-app purchases
Oilcalcs
No in-app purchases
PSC Check
No in-app purchases









