# Oilcalcs vs CMMI App

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.

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.

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.

## The numbers

| Metric | Oilcalcs | CMMI App |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.8 (46 ratings)](https://appshunter.io/ios/app/oilcalcs/id612283154/reviews)** | — |
| Number of ratings | **46** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 2 MB | 29 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [ron mooring](https://appshunter.io/developer/612283157) | [Tanooj Mehra](https://appshunter.io/developer/1438328293) |

## What reviewers say

### Oilcalcs

[App page](https://appshunter.io/ios/app/oilcalcs/id612283154)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### CMMI App

[App page](https://appshunter.io/ios/app/cmmi-app/id6476921990)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*