# Boiler Efficiency vs Air Density Calculator

The clearest difference is review sentiment: Air Density Calculator at 100% against Boiler Efficiency's 0%. Air Density Calculator also leads on price ($2.99 vs $5.99). Boiler Efficiency's advantage is iOS requirement (14.3 vs 17.6). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

Boiler Efficiency costs $5.99 and Air Density 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, Air Density Calculator every 20 months. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Boiler Efficiency | Air Density Calculator |
| --- | --- | --- |
| Price | $5.99 | **$2.99** |
| Rating | — | **[3.8 (4 ratings)](https://appshunter.io/ios/app/air-density-calculator/id1421668162/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 20 months |
| Monetization | Paid | Paid |
| Size | 2 MB | 1 MB |
| Requires iOS | **14.3** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| 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

**In-app purchases:** none


### Air Density Calculator

[App page](https://appshunter.io/ios/app/air-density-calculator/id1421668162)

Instantly calculate air density and atmospheric properties with this offline engineering tool. Features three modes for density, reverse solving, and altitude estimation, with flexible unit support and calculation breakdown.

**Highlights:** Accurate air density calculation, Density, Reverse Solve, and Altitude modes, Flexible unit support, Show calculation steps, Tap to copy results, Calculation history, Offline functionality

**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 Air Density Calculator free?

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

### Do Boiler Efficiency or Air Density Calculator have ads?

Neither Boiler Efficiency nor Air Density Calculator shows ads.

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

Boiler Efficiency ships an update every 10 months, and Air Density Calculator every 20 months. Most recently, Boiler Efficiency was updated on October 20, 2026 and Air Density Calculator on October 24, 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.*