# KRAH Pipe Calculation vs Pypley

The clearest difference is price: KRAH Pipe Calculation at Free against Pypley's $2.99. Pypley's advantage is update cadence (every 3 weeks vs every 2 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

KRAH Pipe Calculation is free to download; Pypley costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

KRAH Pipe Calculation ships an update every 2 months, Pypley every 3 weeks. The most recent releases landed on October 10, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | KRAH Pipe Calculation | Pypley |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/pypley/id1540444278/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 83.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | — | Paid |
| Size | 74 MB | 4 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Krah GmbH](https://appshunter.io/developer/1379033149) | [Ali Mohammed](https://appshunter.io/developer/1540444280) |

## What reviewers say

### KRAH Pipe Calculation

[App page](https://appshunter.io/ios/app/krah-pipe-calculation/id1379033150)

**Features:** macOS Compatibility

**In-app purchases:** none


### Pypley

[App page](https://appshunter.io/ios/app/pypley/id1540444278)

This app calculates flow rate, pressure drop, and pump performance for circular pipe systems. It supports custom pumps and fittings, and allows for unit conversions between Metric and US Imperial. Ideal for hydraulic and process engineers for early-stage design and quick estimations.

**Highlights:** Flow rate and pressure drop calculation, Customizable pump and fitting database, Metric/Imperial unit conversion, Pump performance curve plotting, Cavitation risk assessment (NPSH), Reynolds number and friction factor calculation

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

**In-app purchases:** none


## Frequently asked questions

### Is KRAH Pipe Calculation free?

KRAH Pipe Calculation is free to download, with no in-app purchases.

### Is Pypley free?

Pypley costs $2.99, with no in-app purchases.

### Do KRAH Pipe Calculation or Pypley have ads?

Neither KRAH Pipe Calculation nor Pypley shows ads.

### Which is updated more often, KRAH Pipe Calculation or Pypley?

KRAH Pipe Calculation ships an update every 2 months, and Pypley every 3 weeks. Most recently, KRAH Pipe Calculation was updated on October 10, 2026 and Pypley on October 20, 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.*