Comparison

Haverly's PetroCalc vs Samogon

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Haverly's PetroCalc

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
Read full description

PETROCALC – THE TRUSTED PETROLEUM CALCULATOR IN YOUR POCKET PetroCalc is the all‑in‑one oil & gas calculator that engineers, technicians, and students rely on for fast, accurate viscosity calculations, crude‑oil blending, and every other petroleum‑property task. Whether you need an oil calculator for the field, a crude‑oil calculator for the lab, or a classroom reference, PetroCalc streamlines every petroleum calculation—from viscosity blending to heating‑value look‑ups—completely offline. KEY FEATURES • Unit Conversion – Instantly switch between energy units (MJ/m³, MBTU/bbl, BTU/gal, kCal), temperature (°F/°C), pressure (psi/bar), oil‑density & gravity (kg/m³, API °, specific gravity), kinematic ↔ dynamic viscosity (cSt ↔ cP) and operational scales (SUS, SFS, Redwood I, Engler °), plus calorific‑value conversions and more with our intuitive oil & gas calculator interface. • Distillation‑Curve Tools – Convert temperatures between TBP, ASTM D86, D1160, and D2887 scales and perform yield‑temperature interpolation for full distillation‑curve analysis. • Blending Tools – Execute precise crude‑oil blending and petroleum blending for RVP, Flash Point, Smoke Point, Pour / Cloud / Freeze Point, API Gravity, Aniline Point, Mercaptan Sulfur, Nitrogen, and custom fractions. • Fuel Property Indices – Compute Cetane Index (ASTM D4737 A/B, D976), Driveability Index, Refractive Index, and additional viscosity calculations. • Heating Values – Obtain Gross & Net HHV in MJ/m³, MBTU/bbl, BTU/gal, kCal/kg, and more. • Boiling‑Point Utilities – IBP/EBP plus five average‑boiling‑point methods (Volume, Weight, Molal, Cubic, Mean). • K‑Factor Calculations – UOP K, Watson K, VRC K, Whole‑Crude K at any temperature. • Viscosity Prediction – Single‑point, two‑point (Twu), and API 11A4.2 models with built‑in viscosity‑blending conversions. WHY PETROCALC? • Developed by Haverly Systems, a leader in petroleum‑process modeling. • Optimized for petroleum, chemical, and process engineers—and perfect for students in engineering courses who need a dependable petroleum calculator and oil calculator for coursework. • Works fully offline—no data connection required on‑site. • Simple, accurate, and fast: the only crude‑oil calculator and petroleum‑blending tool you’ll ever need. Download PetroCalc today and tackle every oil & gas calculation—from distillation‑curve conversions and viscosity blending to heating values—with confidence.

About

Samogon

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
Read full description

Moonshiner's calculator - fractional distillation, dilution and mixing with contraction, drip rate measuring, hydrometer correction. - Privacy Policy: http://rexdev.ru/SamStation/pp.html Terms and Conditions: http://rexdev.ru/SamStation/ua.html

Screenshots

Haverly's PetroCalc4 screens
Samogon4 screens

Verdict

The call

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 (76 vs 3). On price, device support and iOS requirement 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

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.

ReceptionRating · Positive reviews · Number of ratings

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 76 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.

UpkeepUpdate frequency

Haverly's PetroCalc ships an update every 2 months, Samogon every 5 days. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard7 real differences · 3 level
Haverly's PetroCalc versus Samogon: the parameters behind the verdict, then further details
ParameterHaverly's PetroCalcSamogon
PriceFreeFree
Rating4.7 (3 ratings) — better4.3 (76 ratings)
Positive reviews100.0% of reviews — better52.3% of reviews
Number of ratings376 — better
Update frequencyEvery 2 monthsEvery 5 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.2 — better13.0
Further details — not scored
Size54 MB114 MB
Age rating4+17+
DeveloperHaverly Systems, Inc.Roman Kolesnichenko

Customer experience

Haverly's PetroCalc

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Samogon

All ratings49 ratings
Positive81.6%
Neutral4.1%
Negative14.3%
Written reviews65 reviews
Positive52.3%
Neutral3.1%
Negative44.6%

In-app purchases

None

Haverly's PetroCalc

No in-app purchases

3 purchases

Samogon

Subscriptions2
  • Monthly Premium Access$0.991 Month
  • Yearly Premium Access$3.991 Year
One-time1
  • Premium Forever$17.99

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 76 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 3, 2026.

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