# Boiler Efficiency vs Viscosity Conversion

The clearest difference is update cadence: Boiler Efficiency at every 10 months against Viscosity Conversion's every 30 months. Viscosity Conversion's advantage is price ($2.99 vs $5.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Boiler Efficiency costs $5.99 and Viscosity Conversion $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, Viscosity Conversion every 30 months. The most recent releases landed on September 16, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Boiler Efficiency | Viscosity Conversion |
| --- | --- | --- |
| Price | $5.99 | **$2.99** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 30 months |
| Monetization | 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

**In-app purchases:** none


### Viscosity Conversion

[App page](https://appshunter.io/ios/app/viscosity-conversion/id630288155)

**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 Viscosity Conversion free?

Viscosity Conversion costs $2.99, with no in-app purchases.

### Do Boiler Efficiency or Viscosity Conversion have ads?

Neither Boiler Efficiency nor Viscosity Conversion shows ads.

### Which is updated more often, Boiler Efficiency or Viscosity Conversion?

Boiler Efficiency ships an update every 10 months, and Viscosity Conversion every 30 months. Most recently, Boiler Efficiency was updated on September 16, 2026 and Viscosity Conversion on September 23, 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.*