# Boiler Efficiency vs Calc pH

The clearest difference is price: Calc pH at Free against Boiler Efficiency's $5.99. Calc pH also leads on iOS requirement (9.0 vs 14.3). Boiler Efficiency's advantage is update cadence (every 10 months vs every 59 months). On ads, in-app purchases and device support there is nothing between them.

Calc pH is free to download; Boiler Efficiency costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Boiler Efficiency ships an update every 10 months, Calc pH every 59 months. The most recent releases landed on October 3, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Boiler Efficiency | Calc pH |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 59 months |
| Monetization | Paid | — |
| Size | 2 MB | 0 MB |
| Requires iOS | 14.3 | **9.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kaup Shenoy Associates](https://appshunter.io/developer/460148822) | [ZOFTERM](https://appshunter.io/developer/557950548) |

## What reviewers say

### Boiler Efficiency

[App page](https://appshunter.io/ios/app/boiler-efficiency/id490506363)

Perform preliminary audits on boiler efficiency and identify various losses in steam generation. Customize boiler applications, compare fuel grades, and analyze heat balance and flue gas for potential savings and improvements.

**Highlights:** Boiler efficiency audits, Loss identification, Customizable boiler applications, Fuel grade comparison, Heat balance sheet, Flue gas analysis, CHP (Brayton) cycle analysis

**Features:** macOS Compatibility

**In-app purchases:** none


### Calc pH

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Boiler Efficiency free?

Boiler Efficiency costs $5.99, with no in-app purchases.

### Is Calc pH free?

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

### Do Boiler Efficiency or Calc pH have ads?

Neither Boiler Efficiency nor Calc pH shows ads.

### Which is updated more often, Boiler Efficiency or Calc pH?

Boiler Efficiency ships an update every 10 months, and Calc pH every 59 months. Most recently, Boiler Efficiency was updated on October 3, 2026 and Calc pH on October 4, 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.*