Comparison

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.

Head to head
About

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.

Highlights
  • Solve flow rate equations
  • Customizable diameter units
  • Customizable velocity units
  • Customizable flow rate units
  • Set decimal places
Features
Read full description

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

About

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.

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
Read full description

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

Flow Rate Help3 screens
Air Flow Conversion Calculator4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Flow Rate Help versus Air Flow Conversion Calculator: the parameters behind the verdict, then further details
ParameterFlow Rate HelpAir Flow Conversion Calculator
Price$0.99 — better$2.99
Rating4.3 (44 ratings) — better3.5 (11 ratings)
Positive reviews0.0% of reviews0.0% of reviews
Number of ratings44 — better11
Update frequencyEvery 15 months — betterEvery 47 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS11.0 — better12.0
Further details — not scored
Size3 MB8 MB
Age rating4+4+
DeveloperArmchair EngineeringNitrio

Customer experience

Flow Rate Help

All ratings44 ratings
Positive86.4%
Neutral0.0%
Negative13.6%
Written reviews3 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Air Flow Conversion Calculator

All ratings11 ratings
Positive54.5%
Neutral18.2%
Negative27.3%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Flow Rate Help

No in-app purchases

None

Air Flow Conversion Calculator

No in-app purchases

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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