# Pipe Pressure drop calculator vs Process Engineer Calc

The clearest difference is in-app purchases: Process Engineer Calc at none against Pipe Pressure drop calculator's 1. Process Engineer Calc also leads on update cadence (every 10 days vs every 3 months). Pipe Pressure drop calculator's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 17.0). On price and ads there is nothing between them.

Both are free to download. Pipe Pressure drop calculator sells 1 one-off in-app purchase. Process Engineer Calc asks for nothing beyond the download.

Pipe Pressure drop calculator ships an update every 3 months, Process Engineer Calc every 10 days. The most recent releases landed on September 8, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Pipe Pressure drop calculator | Process Engineer Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 10 days** |
| Size | 61 MB | 11 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ashvin Kevadiya](https://appshunter.io/developer/1756324971) | [冯泰 蔡](https://appshunter.io/developer/1896641064) |

## What reviewers say

### Pipe Pressure drop calculator

[App page](https://appshunter.io/ios/app/pipe-pressure-drop-calculator/id6752385472)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Premium | $7.99 | one-time |


### Process Engineer Calc

[App page](https://appshunter.io/ios/app/process-engineer-calc-lms/id6774295442)

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

**In-app purchases:** none


## Frequently asked questions

### Is Pipe Pressure drop calculator free?

Pipe Pressure drop calculator is free to download, with in-app purchases available.

### Is Process Engineer Calc free?

Process Engineer Calc is free to download, with no in-app purchases.

### Do Pipe Pressure drop calculator or Process Engineer Calc have ads?

Neither Pipe Pressure drop calculator nor Process Engineer Calc shows ads.

### Which is updated more often, Pipe Pressure drop calculator or Process Engineer Calc?

Pipe Pressure drop calculator ships an update every 3 months, and Process Engineer Calc every 10 days. Most recently, Pipe Pressure drop calculator was updated on September 8, 2026 and Process Engineer Calc on September 12, 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.*