# Flow Rate Help vs Air Flow Conversion Calculator

The clearest difference is rating: Flow Rate Help at 4.3 against Air Flow Conversion Calculator's 3.5. Flow Rate Help also leads on update cadence (every 15 months vs every 47 months) and price ($0.99 vs $2.99). On review sentiment, ads, in-app purchases and monetization model there is nothing between them.

Flow Rate Help costs $0.99 and Air Flow Conversion Calculator $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Flow Rate Help holds the better App Store score, 4.3 against 3.5. Both are backed by a comparable volume of ratings — 44 and 11 respectively. Written reviews split almost evenly too, at 0% and 0% positive.

Flow Rate Help ships an update every 15 months, Air Flow Conversion Calculator every 47 months. The most recent releases landed on August 6, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Flow Rate Help | Air Flow Conversion Calculator |
| --- | --- | --- |
| Price | **$0.99** | $2.99 |
| Rating | **[4.3 (44 ratings)](https://appshunter.io/ios/app/flow-rate-help/id1009898806/reviews)** | [3.5 (11 ratings)](https://appshunter.io/ios/app/air-flow-conversion-calculator/id1375810553/reviews) |
| Number of ratings | **44** | 11 |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 15 months** | Every 47 months |
| Monetization | Paid | Paid |
| Size | 3 MB | 8 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Armchair Engineering](https://appshunter.io/developer/398901339) | [Nitrio](https://appshunter.io/developer/321121189) |

## What reviewers say

### 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


### Air Flow Conversion Calculator

[App page](https://appshunter.io/ios/app/air-flow-conversion-calculator/id1375810553)

Easily calculate air velocity and airflow volume for various duct types. Input dimensions and units, and get instant results for HVAC and ventilation applications.

**Highlights:** Calculate air velocity and airflow volume, Support for circular and rectangular ducts, Multiple unit options for velocity, volume, and dimensions, Instant result display, Useful for HVAC and ventilation

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

**In-app purchases:** none


## Frequently asked questions

### Is Flow Rate Help free?

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

### Is Air Flow Conversion Calculator free?

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

### Which has better reviews, Flow Rate Help or Air Flow Conversion Calculator?

Flow Rate Help is rated higher. Flow Rate Help averages 4.3 out of 5 from 44 ratings, while Air Flow Conversion Calculator averages 3.5 from 11 ratings.

### Do Flow Rate Help or Air Flow Conversion Calculator have ads?

Neither Flow Rate Help nor Air Flow Conversion Calculator shows ads.

### Which is updated more often, Flow Rate Help or Air Flow Conversion Calculator?

Flow Rate Help ships an update every 15 months, and Air Flow Conversion Calculator every 47 months. Most recently, Flow Rate Help was updated on August 6, 2026 and Air Flow Conversion Calculator on September 18, 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.*