Comparison

Resistor Tools Pro vs Air Density Calculator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Resistor Tools Pro

This utility app offers a suite of tools for calculating and finding resistor combinations. It's designed for electronics enthusiasts and professionals needing to determine series, parallel, and voltage divider configurations. Save and share your calculations easily.

Highlights
  • Calculate series/parallel resistance
  • Find resistor combinations for desired resistance
  • Voltage divider ratio and value calculation
  • Inverting amplifier gain calculation
  • Save combinations to CSV
  • Share via AirDrop
  • Upload CSV to iCloud Drive
Read full description

This app is a collection of resistor calculators. It is suitable for hobbyist or electronic engineer. * Calculate resistance of 2 resistors in series or parallel * Find out combinations of 2 resistors in series/parallel making a desired resistance * Calculate ratio of R1/R2 and voltage divider * Find out resistor values of making voltage divider ratio * Find out resistor values of making inverting amplifier gain * Save combination values in CSV file * Share document via AirDrop * Upload CSV file to iCloud Drive (For iOS8 or later)

About

Air Density Calculator

Instantly calculate air density and atmospheric properties with this offline engineering tool. Features three modes for density, reverse solving, and altitude estimation, with flexible unit support and calculation breakdown.

Highlights
  • Accurate air density calculation
  • Density, Reverse Solve, and Altitude modes
  • Flexible unit support
  • Show calculation steps
  • Tap to copy results
  • Calculation history
  • Offline functionality
Features
Read full description

Calculate air density and atmospheric properties instantly with this professional engineering calculator. Designed for engineers, pilots, meteorologists, and physics students who need quick, accurate results without an internet connection. Accurate Air Density Calculation Compute air density using the ideal gas law: ρ = (pd / (rd * T)) + (pv / (rv * T)). Enter temperature and pressure in your preferred units and get precise results immediately. Three Powerful Modes • Density Mode - Calculate air density from temperature and pressure inputs • Reverse Solve Mode - Find any unknown variable (pressure, temperature, or density) when the other two are known • Altitude Mode - Estimate temperature, pressure, and air density at any altitude using the International Standard Atmosphere (ISA) model Flexible Unit Support Switch freely between units: • Temperature: Celsius / Kelvin • Pressure: Pa / hPa / atm • Altitude: meters / feet All conversions are handled automatically so you can work in the units you prefer. Show Your Work Tap "Show Steps" to reveal the full calculation breakdown including the formula used, unit conversions, substituted values, and final result. Perfect for learning, teaching, or verifying your work. Tap to Copy Tap any result to copy it to your clipboard instantly. Paste values directly into reports, spreadsheets, or other tools. Calculation History Save your results, review past calculations, or swipe to delete. Built for Professionals • Works completely offline. No internet required. • Clean, distraction-free interface designed for fast input • Built-in reference page with formulas, constants, and unit conversions • Supports Dark Mode • Optimized for iPhone and iPad Who Is This For? • Aerospace and mechanical engineers • Pilots and aviation professionals • HVAC technicians • Meteorologists and atmospheric scientists • Physics and engineering students • Anyone working with gas laws and atmospheric data Download now and get reliable air density calculations in seconds. Thank you for your support. Please visit nitrio.com for more apps for your iOS devices.

Screenshots

Resistor Tools Pro4 screens
Air Density Calculator4 screens

Verdict

The call

The clearest difference is update cadence: Resistor Tools Pro at every 2 months against Air Density Calculator's every 20 months. Resistor Tools Pro also leads on rating (4.0 vs 3.8) and price ($0.99 vs $2.99). Air Density Calculator's advantage is ratings volume (4 vs 1). On ads, in-app purchases, monetization model and device support 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

Resistor Tools Pro costs $0.99 and Air Density Calculator $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Resistor Tools Pro holds the better App Store score, 4.0 against 3.8. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

UpkeepUpdate frequency

Resistor Tools Pro ships an update every 2 months, Air Density Calculator every 20 months. The most recent releases landed on November 4, 2026 and November 2, 2026 respectively.

Scorecard5 real differences · 5 level
Resistor Tools Pro versus Air Density Calculator: the parameters behind the verdict, then further details
ParameterResistor Tools ProAir Density Calculator
Price$0.99 — better$2.99
Rating4.0 (1 ratings) — better3.8 (4 ratings)
Positive reviews—100.0% of reviews
Number of ratings14 — better
Update frequencyEvery 2 months — betterEvery 20 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better17.6
Further details — not scored
Size4 MB1 MB
Age rating4+4+
DeveloperSiu Yuen HoNitrio

Customer experience

Resistor Tools Pro

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Air Density Calculator

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Resistor Tools Pro

No in-app purchases

None

Air Density Calculator

No in-app purchases

Questions

Is Resistor Tools Pro free?
Resistor Tools Pro costs $0.99, with no in-app purchases.
Is Air Density Calculator free?
Air Density Calculator costs $2.99, with no in-app purchases.
Which has better reviews, Resistor Tools Pro or Air Density Calculator?
Resistor Tools Pro is rated higher. Resistor Tools Pro averages 4.0 out of 5 from 1 ratings, while Air Density Calculator averages 3.8 from 4 ratings.
Do Resistor Tools Pro or Air Density Calculator have ads?
Neither Resistor Tools Pro nor Air Density Calculator shows ads.
Which is updated more often, Resistor Tools Pro or Air Density Calculator?
Resistor Tools Pro ships an update every 2 months, and Air Density Calculator every 20 months. Most recently, Resistor Tools Pro was updated on November 4, 2026 and Air Density Calculator on November 2, 2026.

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