# Calc pH vs Pipe Coil Development Pro

The clearest difference is price: Calc pH at Free against Pipe Coil Development Pro's $3.99. Calc pH also leads on iOS requirement (9.0 vs 16.1). On update cadence, ads, in-app purchases and device support there is nothing between them.

Calc pH is free to download; Pipe Coil Development Pro costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Calc pH ships an update every 59 months, Pipe Coil Development Pro every 41 months. The most recent releases landed on September 17, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Calc pH | Pipe Coil Development Pro |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 59 months | **Every 41 months** |
| Size | 0 MB | 1 MB |
| Requires iOS | **9.0** | 16.1 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ZOFTERM](https://appshunter.io/developer/557950548) | [Imran Pinjara](https://appshunter.io/developer/1484488781) |

## What reviewers say

### Calc pH

[App page](https://appshunter.io/ios/app/calc-ph/id566354963)

**Features:** macOS Compatibility

**In-app purchases:** none


### Pipe Coil Development Pro

[App page](https://appshunter.io/ios/app/pipe-coil-development-pro/id1491738588)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calc pH free?

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

### Is Pipe Coil Development Pro free?

Pipe Coil Development Pro costs $3.99, with no in-app purchases.

### Do Calc pH or Pipe Coil Development Pro have ads?

Neither Calc pH nor Pipe Coil Development Pro shows ads.

### Which is updated more often, Calc pH or Pipe Coil Development Pro?

Calc pH ships an update every 59 months, and Pipe Coil Development Pro every 41 months. Most recently, Calc pH was updated on September 17, 2026 and Pipe Coil Development Pro on September 8, 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.*