# SEC Heat Transfer vs Pypley

The clearest difference is price: SEC Heat Transfer at Free against Pypley's $2.99. Pypley's advantage is update cadence (every 3 weeks vs every 3 months) and iOS requirement (13.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

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

SEC Heat Transfer ships an update every 3 months, Pypley every 3 weeks. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | SEC Heat Transfer | 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 3 months | **Every 3 weeks** |
| Monetization | — | Paid |
| Size | 10 MB | 4 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [S.E.C. Accessories Limited](https://appshunter.io/developer/1483746720) | [Ali Mohammed](https://appshunter.io/developer/1540444280) |

## What reviewers say

### SEC Heat Transfer

[App page](https://appshunter.io/ios/app/sec-heat-transfer/id1483746721)

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

**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 SEC Heat Transfer free?

SEC Heat Transfer is free to download, with no in-app purchases.

### Is Pypley free?

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

### Do SEC Heat Transfer or Pypley have ads?

Neither SEC Heat Transfer nor Pypley shows ads.

### Which is updated more often, SEC Heat Transfer or Pypley?

SEC Heat Transfer ships an update every 3 months, and Pypley every 3 weeks. Most recently, SEC Heat Transfer was updated on November 7, 2026 and Pypley on November 3, 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.*