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.
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.
- 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
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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)
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.
- Accurate air density calculation
- Density, Reverse Solve, and Altitude modes
- Flexible unit support
- Show calculation steps
- Tap to copy results
- Calculation history
- Offline functionality
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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
Verdict
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
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.
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.
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.
| Parameter | Resistor Tools Pro | Air Density Calculator |
|---|---|---|
| Price | $0.99 — better | $2.99 |
| Rating | 4.0 (1 ratings) — better | 3.8 (4 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 4 — better |
| Update frequency | Every 2 months — better | Every 20 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 4 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Siu Yuen Ho | Nitrio |
Customer experience
Resistor Tools Pro
Air Density Calculator
In-app purchases
Resistor Tools Pro
No in-app purchases
Air Density Calculator
No in-app purchases
Questions
Is Resistor Tools Pro free?
Is Air Density Calculator free?
Which has better reviews, Resistor Tools Pro or Air Density Calculator?
Do Resistor Tools Pro or Air Density Calculator have ads?
Which is updated more often, Resistor Tools Pro or Air Density Calculator?
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