# Boiler Efficiency vs Flow Rate Help

The clearest difference is price: Flow Rate Help at $0.99 against Boiler Efficiency's $5.99. Flow Rate Help also leads on device support (4 vs 2) and iOS requirement (11.0 vs 14.3). On review sentiment, update cadence, ads and in-app purchases there is nothing between them.

Boiler Efficiency costs $5.99 and Flow Rate Help $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Boiler Efficiency ships an update every 10 months, Flow Rate Help every 15 months. The most recent releases landed on September 16, 2026 and August 6, 2026 respectively.

## The numbers

| Metric | Boiler Efficiency | Flow Rate Help |
| --- | --- | --- |
| Price | $5.99 | **$0.99** |
| Rating | — | **[4.3 (44 ratings)](https://appshunter.io/ios/app/flow-rate-help/id1009898806/reviews)** |
| Number of ratings | — | **44** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 15 months |
| Monetization | Paid | Paid |
| Size | 2 MB | 3 MB |
| Requires iOS | 14.3 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Kaup Shenoy Associates](https://appshunter.io/developer/460148822) | [Armchair Engineering](https://appshunter.io/developer/398901339) |

## 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


### Flow Rate Help

[App page](https://appshunter.io/ios/app/flow-rate-help/id1009898806)

Calculate liquid flow rate, pipe diameter, or velocity with ease. Customize units for diameter, velocity, and flow rate, and set your preferred decimal places for precise results.

**Highlights:** Solve flow rate equations, Customizable diameter units, Customizable velocity units, Customizable flow rate units, Set decimal places

**Features:** 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 Flow Rate Help free?

Flow Rate Help costs $0.99, with no in-app purchases.

### Do Boiler Efficiency or Flow Rate Help have ads?

Neither Boiler Efficiency nor Flow Rate Help shows ads.

### Which is updated more often, Boiler Efficiency or Flow Rate Help?

Boiler Efficiency ships an update every 10 months, and Flow Rate Help every 15 months. Most recently, Boiler Efficiency was updated on September 16, 2026 and Flow Rate Help on August 6, 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.*