# Celsius® hollow section design vs Pypley

The clearest difference is price: Celsius® hollow section design at Free against Pypley's $2.99. Celsius® hollow section design also leads on review sentiment (100% vs 83%). Pypley's advantage is update cadence (every 3 weeks vs every 7 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Celsius® hollow section design is free to download; Pypley costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Celsius® hollow section design ships an update every 7 months, Pypley every 3 weeks. The most recent releases landed on October 13, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Celsius® hollow section design | Pypley |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/pypley/id1540444278/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | **100.0% of reviews** | 83.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | **Free** | Paid |
| Size | 11 MB | 4 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tata Steel IJmuiden B.V.](https://appshunter.io/developer/1346513780) | [Ali Mohammed](https://appshunter.io/developer/1540444280) |

## What reviewers say

### Celsius® hollow section design

[App page](https://appshunter.io/ios/app/celsius-hollow-section-design/id1484496183)

This app assists structural engineers in selecting the optimal hollow section size based on design load conditions and buckling length. It calculates and lists suitable sections from a comprehensive range, providing key information like efficiency factor and mass per meter. Users can filter results by size, utilization, embodied CO₂, or weight, and share selections via email or messaging.

**Highlights:** Calculate section size based on axial load and buckling length, Select sections for members in bending, List sections with efficiency factor and mass per meter, Filter results by size, utilization, CO₂, or weight, Classify sections by UK market availability, Share selected sections via email or messaging

**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 Celsius® hollow section design free?

Celsius® hollow section design is free to download, with no in-app purchases.

### Is Pypley free?

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

### Do Celsius® hollow section design or Pypley have ads?

Neither Celsius® hollow section design nor Pypley shows ads.

### Which is updated more often, Celsius® hollow section design or Pypley?

Celsius® hollow section design ships an update every 7 months, and Pypley every 3 weeks. Most recently, Celsius® hollow section design was updated on October 13, 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.*