# DistPad vs Haverly's PetroCalc

The clearest difference is rating: Haverly's PetroCalc at 4.7 against DistPad's 3.0. Haverly's PetroCalc also leads on device support (3 vs 1). On price, ratings volume, update cadence and ads 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 holds the better App Store score, 4.7 against 3.0. Both are backed by a comparable volume of ratings — 2 and 3 respectively.

DistPad ships an update every 3 months, Haverly's PetroCalc every 2 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | DistPad | Haverly's PetroCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/distpad/id602147198/reviews) | **[4.7 (3 ratings)](https://appshunter.io/ios/app/haverlys-petrocalc/id1125079839/reviews)** |
| Number of ratings | 2 | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 22 MB | 54 MB |
| Requires iOS | **12.1** | 12.2 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ORBIS BV](https://appshunter.io/developer/602147201) | [Haverly Systems, Inc.](https://appshunter.io/developer/1125079838) |

## What reviewers say

### DistPad

[App page](https://appshunter.io/ios/app/distpad/id602147198)

Control atmospheric distillation analyzers wirelessly for petroleum and petrochemical labs. Monitor sample status, view results in tables and graphs, and export data to LIMS or printers. Easily set up measurement programs and customize reporting formats.

**Highlights:** Wireless analyzer control, Real-time results viewing, Tabular and graphical reporting, Export to LIMS via FTP, Print to Zebra thermal printer, Customizable reporting formats, Sample parameter adjustment

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is DistPad free?

DistPad is free to download, with no in-app purchases.

### Is Haverly's PetroCalc free?

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

### Which has better reviews, DistPad or Haverly's PetroCalc?

Haverly's PetroCalc is rated higher. DistPad averages 3.0 out of 5 from 2 ratings, while Haverly's PetroCalc averages 4.7 from 3 ratings.

### Do DistPad or Haverly's PetroCalc have ads?

Neither DistPad nor Haverly's PetroCalc shows ads.

### Which is updated more often, DistPad or Haverly's PetroCalc?

DistPad ships an update every 3 months, and Haverly's PetroCalc every 2 months. Most recently, DistPad was updated on October 23, 2026 and Haverly's PetroCalc on October 24, 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.*