# Haverly's PetroCalc vs Process Engineer Calc

The clearest difference is update cadence: Process Engineer Calc at every 10 days against Haverly's PetroCalc's every 2 months. Haverly's PetroCalc's advantage is device support (3 vs 1) and iOS requirement (12.2 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Haverly's PetroCalc ships an update every 2 months, Process Engineer Calc every 10 days. The most recent releases landed on September 8, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Haverly's PetroCalc | Process Engineer Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/haverlys-petrocalc/id1125079839/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | Free | — |
| Size | 54 MB | 11 MB |
| Requires iOS | **12.2** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Haverly Systems, Inc.](https://appshunter.io/developer/1125079838) | [冯泰 蔡](https://appshunter.io/developer/1896641064) |

## What reviewers say

### Haverly's PetroCalc

[App page](https://appshunter.io/ios/app/haverlys-petrocalc/id1125079839)

This application provides engineers, technicians, and students with a comprehensive set of tools for petroleum property calculations. It offers features for unit conversion, crude oil blending, viscosity prediction, and distillation curve analysis, all accessible offline.

**Highlights:** Unit conversion for energy, temperature, pressure, and viscosity, Distillation curve analysis and interpolation, Crude oil and petroleum blending calculations, Fuel property index computation, Heating value calculations, Boiling point utilities, K-factor calculations, Viscosity prediction models

**Features:** macOS Compatibility

**In-app purchases:** none


### Process Engineer Calc

[App page](https://appshunter.io/ios/app/process-engineer-calc-lms/id6774295442)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Haverly's PetroCalc free?

Haverly's PetroCalc is free to download, with no in-app purchases.

### Is Process Engineer Calc free?

Process Engineer Calc is free to download, with no in-app purchases.

### Do Haverly's PetroCalc or Process Engineer Calc have ads?

Neither Haverly's PetroCalc nor Process Engineer Calc shows ads.

### Which is updated more often, Haverly's PetroCalc or Process Engineer Calc?

Haverly's PetroCalc ships an update every 2 months, and Process Engineer Calc every 10 days. Most recently, Haverly's PetroCalc was updated on September 8, 2026 and Process Engineer Calc on September 12, 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.*