Flow Rate Help vs Air Flow Conversion Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Flow Rate Help
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.
- Solve flow rate equations
- Customizable diameter units
- Customizable velocity units
- Customizable flow rate units
- Set decimal places
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Quickly find flow rate, required pipe diameter or velocity of a liquid! Features Include: - Accurately solve flow rate equations - Set preferred diameter unit from: mm, cm, m, km, inches, feet, yards and miles - Set preferred velocity unit from: m/s, m/min, km/min, km/h, ft/s, ft/min, mi/min and mph - Set preferred flow rate unit from: m³/s, m³/min, m³/h, l/s, l/min, l/h, gps. gpm and gph - Select your preferred number of decimal places
Air Flow Conversion Calculator
Easily calculate air velocity and airflow volume for various duct types. Input dimensions and units, and get instant results for HVAC and ventilation applications.
- 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
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Air Flow Conversion Calculator calculate the rate of displacement of air or gas at a specific location. - Enter the air velocity or volume airflow. - Choose circular or rectangular duct and type the required dimension(s), then select the appropriate units. - Result will be displayed instantly. Airflow Value:- Velocity Units: -fl/min (LFM) -m/s -miles/hr (MPH) Volume Airflow Units: -ft3/min (CFM) -m3/hr -L/s Dimension Units: -in -foot -mm -cm -m Air velocity (distance traveled per unit of time) is usually expressed in Linear Feet per Minute (LFM). By multiplying air velocity by the cross section area of a duct, you can determine the air volume flowing past a point in the duct per unit of time. Volume flow is usually measured in Cubic Feet per Minute (CFM). Example Concept of Air Velocity can be used in air conditioning, heating and ventilating work. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Flow Rate Help | Air Flow Conversion Calculator |
|---|---|---|
| Price | $0.99 — better | $2.99 |
| Rating | 4.3 (44 ratings) — better | 3.5 (11 ratings) |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| Number of ratings | 44 — better | 11 |
| Update frequency | Every 15 months — better | Every 47 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 3 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Armchair Engineering | Nitrio |
Customer experience
Flow Rate Help
Air Flow Conversion Calculator
In-app purchases
Flow Rate Help
No in-app purchases
Air Flow Conversion Calculator
No in-app purchases
Questions
Is Flow Rate Help free?
Is Air Flow Conversion Calculator free?
Which has better reviews, Flow Rate Help or Air Flow Conversion Calculator?
Do Flow Rate Help or Air Flow Conversion Calculator have ads?
Which is updated more often, Flow Rate Help or Air Flow Conversion Calculator?
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