# Flow Rate Conversion vs Haverly's PetroCalc

The clearest difference is review sentiment: Haverly's PetroCalc at 100% against Flow Rate Conversion's 0%. Haverly's PetroCalc also leads on price (Free vs $2.99) and rating (4.7 vs 3.0). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Haverly's PetroCalc is free to download; Flow Rate Conversion costs $2.99 up front. 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 — 1 and 3 respectively. Written reviews point the same way: 0% of Flow Rate Conversion's written reviews are positive against 100% of Haverly's PetroCalc's.

Flow Rate Conversion ships an update every 29 months, Haverly's PetroCalc every 2 months. The most recent releases landed on September 13, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Flow Rate Conversion | Haverly's PetroCalc |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/flow-rate-conversion/id525300855/reviews) | **[4.7 (3 ratings)](https://appshunter.io/ios/app/haverlys-petrocalc/id1125079839/reviews)** |
| Number of ratings | 1 | **3** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 54 MB |
| Requires iOS | 13 | **12.2** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Haverly Systems, Inc.](https://appshunter.io/developer/1125079838) |

## What reviewers say

### Flow Rate Conversion

[App page](https://appshunter.io/ios/app/flow-rate-conversion/id525300855)

Easily convert between various units of flow rate, including volume-based, mass-based, and mole-based measurements. Essential for physics and engineering applications involving fluid dynamics and hydrometry.

**Highlights:** Volume flow rate conversion, Mass flow rate conversion, Mole-based flow rate conversion, Physics and engineering utility, Fluid dynamics calculations

**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 Flow Rate Conversion free?

Flow Rate Conversion costs $2.99, 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, Flow Rate Conversion or Haverly's PetroCalc?

Haverly's PetroCalc is rated higher. Flow Rate Conversion averages 3.0 out of 5 from 1 ratings, while Haverly's PetroCalc averages 4.7 from 3 ratings.

### Do Flow Rate Conversion or Haverly's PetroCalc have ads?

Neither Flow Rate Conversion nor Haverly's PetroCalc shows ads.

### Which is updated more often, Flow Rate Conversion or Haverly's PetroCalc?

Flow Rate Conversion ships an update every 29 months, and Haverly's PetroCalc every 2 months. Most recently, Flow Rate Conversion was updated on September 13, 2026 and Haverly's PetroCalc on September 8, 2026.

---

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