Oilcalcs vs Substations
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
Substations
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Delta Sama Jaya Sdn Bhd is a company that specializes in substation, cabling installation and supplies. Our premise is based in Kuala Lumpur (KL), Malaysia. We are committed to support our customers to the best of our abilities by providing sound professional advice, prompt response, accurate order taking and on-time product delivery. Feel free to browse through our website for more details. Electrical We provide the top-notch electrical products and accessories for high voltage usage and substation environments. All the products and accessories are in high quality and has been tested many times to match the standards and safety features. Rail Accesories Rail accessories are the products and accessories that used for the maintenance and construction of rail related works. In Delta Sama Jaya, we have various rail products and accessories that are able to meet your needs and requirements. Safety Equipment Safety Equipment and Accessories is the products and accessories used for safety reasons in electrical site works to help preventing injuries and fatalities when handling with high voltage works. Passive Fire Protection In Delta Sama Jaya, we offer various high quality fire protection paint to help you protect your steel structures and cable against high heat and fire. Key Features: - Access latest company information and news from us. - Easily search products and directly send email enquiry to us. - Easy to find our contact information and location. - Push Notification update for products & news. Website: https://www.substations.com.my #App Developed by: NEWPAGES NETWORK SDN BHD https://www.newpages.com.my
Screenshots
Verdict
The clearest difference is price: Substations at Free against Oilcalcs's $9.99. Substations also leads on iOS requirement (11.0 vs 15.6). Oilcalcs's advantage is update cadence (every 4 months vs every 66 months). On ads, in-app purchases 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
Substations is free to download; Oilcalcs costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Oilcalcs ships an update every 4 months, Substations every 66 months. The most recent releases landed on September 17, 2026 and September 9, 2026 respectively.
| Parameter | Oilcalcs | Substations |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 4.8 (46 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 46 — better | — |
| Update frequency | Every 4 months — better | Every 66 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 11.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 32 MB |
| Age rating | 4+ | 12+ |
| Developer | ron mooring | Delta Sama Jaya Sdn Bhd |
In-app purchases
Oilcalcs
No in-app purchases
Substations
No in-app purchases







