# Resistor Tools Pro vs Air Density Calculator

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.

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.

## The numbers

| Metric | Resistor Tools Pro | Air Density Calculator |
| --- | --- | --- |
| Price | **$0.99** | $2.99 |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/resistor-tools-pro/id825620924/reviews)** | [3.8 (4 ratings)](https://appshunter.io/ios/app/air-density-calculator/id1421668162/reviews) |
| Number of ratings | 1 | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 20 months |
| Monetization | Paid | Paid |
| Size | 4 MB | 1 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Nitrio](https://appshunter.io/developer/321121189) |

## What reviewers say

### Resistor Tools Pro

[App page](https://appshunter.io/ios/app/resistor-tools-pro/id825620924)

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

**In-app purchases:** none


### Air Density Calculator

[App page](https://appshunter.io/ios/app/air-density-calculator/id1421668162)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*