Comparison

Oilcalcs vs CMMI App

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

CMMI App

Features
Read full description

Founded in 1957 by a group of Master Mariners and registered under the Company's Act of 1956, 'The Company of Master Mariners of India' is a professional body representing Master Mariners with the purpose of developing and promoting the traditions and standards of the Merchant Navy in India. Today it is the only body of its kind in India with 15 chapters, 2 overseas chapter and over 3500 members. CMMI provide a valuable service to the seafarers in India through various activities such as conducting educational seminars, publishing books and magazines, advising and assisting the DGS and promoting the Merchant Navy as a career option for youngsters.

Screenshots

Oilcalcs4 screens
CMMI App4 screens

Verdict

The call

The clearest difference is price: CMMI App at Free against Oilcalcs's $9.99. CMMI App also leads on update cadence (every 2 months vs every 4 months) and iOS requirement (13.0 vs 15.6). 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

CostPrice · In-app purchases · Ads · Monetization

CMMI App is free to download; Oilcalcs costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Oilcalcs ships an update every 4 months, CMMI App every 2 months. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

Scorecard3 real differences · 7 level
Oilcalcs versus CMMI App: the parameters behind the verdict, then further details
ParameterOilcalcsCMMI App
Price$9.99Free — better
Rating4.8 (46 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings46 — better—
Update frequencyEvery 4 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.613.0 — better
Further details — not scored
Size2 MB29 MB
Age rating4+17+
Developerron mooringTanooj Mehra

In-app purchases

None

Oilcalcs

No in-app purchases

None

CMMI App

No in-app purchases

Questions

Is Oilcalcs free?
Oilcalcs costs $9.99, with no in-app purchases.
Is CMMI App free?
CMMI App is free to download, with no in-app purchases.
Do Oilcalcs or CMMI App have ads?
Neither Oilcalcs nor CMMI App shows ads.
Which is updated more often, Oilcalcs or CMMI App?
Oilcalcs ships an update every 4 months, and CMMI App every 2 months. Most recently, Oilcalcs was updated on October 26, 2026 and CMMI App on October 25, 2026.

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