Comparison

Oilcalcs vs H/Comet Mobile

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

H/Comet Mobile

Access and manage crude assay data, slates, blends, and cut sets on the go. Search for assays, modify cut sets, and perform slate operations like comparisons and graphing. Analyze data with value/cut lookup tools.

Highlights
  • Access assay libraries, slates, blends, and cut sets
  • Search and view detailed assay data
  • Re-cut assays with H/CAMS technology
  • Create and modify cut sets
  • Access and modify existing or create new slates
  • Perform slate operations like cut comparisons and graphing
  • Access and modify existing or create new blends
Features
Read full description

H/Comet-Mobile by Haverly Systems allows H/Comet customers to access their existing H/Comet assay libraries, slates, blends, and cut sets on the go by logging in with their H/Comet credentials. Users have several search filters they may use to find the perfect assay and view detailed assay data. Assays can be re-cut with H/CAMS technology by editing the gray boiling point fields, or with a saved cut set. Users can also create and modify cut sets (with or without tray inefficiencies). In addition, users can access and modify existing slates or create new ones. Slate operations such as cut comparisons and group graphing can be done on a slate. H/Comet Mobile also supports blends, so users can access (and modify) existing blends as well as create new ones. Finally, assays can be graphed and then analyzed with value/cut lookup tools. Help us improve this app! If you would like to report a bug, suggest a feature, or require customer support pertaining to this app, please email john@haverly.com.

Screenshots

Oilcalcs4 screens
H/Comet Mobile4 screens

Verdict

The call

The clearest difference is price: H/Comet Mobile at Free against Oilcalcs's $9.99. H/Comet Mobile also leads on update cadence (every 3 weeks vs every 4 months) and rating (5.0 vs 4.8). Oilcalcs's advantage is ratings volume (46 vs 2). 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

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

ReceptionRating · Positive reviews · Number of ratings

H/Comet Mobile 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 2, so its average is the more settled of the two.

UpkeepUpdate frequency

Oilcalcs ships an update every 4 months, H/Comet Mobile every 3 weeks. The most recent releases landed on October 26, 2026 and October 8, 2026 respectively.

Scorecard6 real differences · 4 level
Oilcalcs versus H/Comet Mobile: the parameters behind the verdict, then further details
ParameterOilcalcsH/Comet Mobile
Price$9.99Free — better
Rating4.8 (46 ratings)5.0 (2 ratings) — better
Positive reviews100.0% of reviews—
Number of ratings46 — better2
Update frequencyEvery 4 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.69.2 — better
Further details — not scored
Size2 MB58 MB
Age rating4+4+
Developerron mooringHaverly Systems, Inc.

Customer experience

Oilcalcs

All ratings46 ratings
Positive93.5%
Neutral6.5%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

H/Comet Mobile

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

In-app purchases

None

Oilcalcs

No in-app purchases

None

H/Comet Mobile

No in-app purchases

Questions

Is Oilcalcs free?
Oilcalcs costs $9.99, with no in-app purchases.
Is H/Comet Mobile free?
H/Comet Mobile is free to download, with no in-app purchases.
Which has better reviews, Oilcalcs or H/Comet Mobile?
H/Comet Mobile is rated higher. Oilcalcs averages 4.8 out of 5 from 46 ratings, while H/Comet Mobile averages 5.0 from 2 ratings.
Do Oilcalcs or H/Comet Mobile have ads?
Neither Oilcalcs nor H/Comet Mobile shows ads.
Which is updated more often, Oilcalcs or H/Comet Mobile?
Oilcalcs ships an update every 4 months, and H/Comet Mobile every 3 weeks. Most recently, Oilcalcs was updated on October 26, 2026 and H/Comet Mobile on October 8, 2026.

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