# Boiler Efficiency vs Pulley Calculator

The clearest difference is review sentiment: Pulley Calculator at 25% against Boiler Efficiency's 0%. Pulley Calculator also leads on price ($2.99 vs $5.99). Boiler Efficiency's advantage is update cadence (every 10 months vs every 46 months). On ads, in-app purchases, monetization model and device support there is nothing between them.

Boiler Efficiency costs $5.99 and Pulley Calculator $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Boiler Efficiency ships an update every 10 months, Pulley Calculator every 46 months. The most recent releases landed on October 30, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Boiler Efficiency | Pulley Calculator |
| --- | --- | --- |
| Price | $5.99 | **$2.99** |
| Rating | — | **[3.7 (34 ratings)](https://appshunter.io/ios/app/pulley-calculator/id1388205210/reviews)** |
| Number of ratings | — | **34** |
| Positive reviews | 0.0% of reviews | **25.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 46 months |
| Monetization | Paid | Paid |
| Size | 2 MB | 1 MB |
| Requires iOS | 14.3 | **13** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kaup Shenoy Associates](https://appshunter.io/developer/460148822) | [Nitrio](https://appshunter.io/developer/321121189) |

## 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, Vision Pro support

**In-app purchases:** none


### Pulley Calculator

[App page](https://appshunter.io/ios/app/pulley-calculator/id1388205210)

This engineering calculator helps determine belt length, ratio, RPM, and belt speed for pulley systems. It offers instant calculations with copyable results and includes formulas for reference.

**Highlights:** Calculate Belt Length, Calculate Ratio, Calculate RPM, Calculate Belt Speed, Instant calculations, Copyable results, Includes formulas

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

**In-app purchases:** none


## Frequently asked questions

### Is Boiler Efficiency free?

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

### Is Pulley Calculator free?

Pulley Calculator costs $2.99, with no in-app purchases.

### Do Boiler Efficiency or Pulley Calculator have ads?

Neither Boiler Efficiency nor Pulley Calculator shows ads.

### Which is updated more often, Boiler Efficiency or Pulley Calculator?

Boiler Efficiency ships an update every 10 months, and Pulley Calculator every 46 months. Most recently, Boiler Efficiency was updated on October 30, 2026 and Pulley Calculator on October 29, 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.*