# Haverly's PetroCalc vs Samogon

The clearest difference is review sentiment: Haverly's PetroCalc at 100% against Samogon's 52%. Haverly's PetroCalc also leads on in-app purchases (none vs 3) and ads (none vs shown). Samogon's advantage is update cadence (every 5 days vs every 2 months) and ratings volume (77 vs 3). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Samogon sells 3 in-app purchases, starting at $0.99 per month. Haverly's PetroCalc asks for nothing beyond the download.

Haverly's PetroCalc holds the better App Store score, 4.7 against 4.3. That said, the two scores are not equally well evidenced: Samogon has 77 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 100% of Haverly's PetroCalc's written reviews are positive against 52% of Samogon's.

Haverly's PetroCalc ships an update every 2 months, Samogon every 5 days. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Haverly's PetroCalc | Samogon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/haverlys-petrocalc/id1125079839/reviews)** | [4.3 (77 ratings)](https://appshunter.io/ios/app/samogon/id1532844245/reviews) |
| Number of ratings | 3 | **77** |
| Positive reviews | **100.0% of reviews** | 52.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 54 MB | 114 MB |
| Requires iOS | **12.2** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Haverly Systems, Inc.](https://appshunter.io/developer/1125079838) | [Roman Kolesnichenko](https://appshunter.io/developer/602824943) |

## 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


### Samogon

[App page](https://appshunter.io/ios/app/samogon/id1532844245)

This app assists with the complex calculations involved in moonshining. It handles fractional distillation, dilution, mixing, drip rate measurement, and hydrometer corrections.

**Highlights:** Fractional distillation calculations, Dilution and mixing calculations, Contraction calculations, Drip rate measuring, Hydrometer correction

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium Access | $0.99 | per month |
| Yearly Premium Access | $3.99 | per year |
| Premium Forever | $17.99 | one-time |


## Frequently asked questions

### Is Haverly's PetroCalc free?

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

### Is Samogon free?

Samogon is free to download, with in-app purchases available.

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

Haverly's PetroCalc is rated higher. Haverly's PetroCalc averages 4.7 out of 5 from 3 ratings, while Samogon averages 4.3 from 77 ratings.

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

Samogon shows ads; Haverly's PetroCalc does not.

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

Haverly's PetroCalc ships an update every 2 months, and Samogon every 5 days. Most recently, Haverly's PetroCalc was updated on November 2, 2026 and Samogon on November 7, 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.*