# Resistor Tools vs HCC2D Decoder

The clearest difference is in-app purchases: HCC2D Decoder at none against Resistor Tools's 1. HCC2D Decoder also leads on update cadence (fortnightly vs every 2 months). Resistor Tools's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 17.0). On price and ads there is nothing between them.

Both are free to download. Resistor Tools sells 1 one-off in-app purchase. HCC2D Decoder asks for nothing beyond the download.

Resistor Tools ships an update every 2 months, HCC2D Decoder fortnightly. The most recent releases landed on September 24, 2026 and September 3, 2026 respectively.

## The numbers

| Metric | Resistor Tools | HCC2D Decoder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (10 ratings)](https://appshunter.io/ios/app/resistor-tools/id826045228/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 8 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Marco Querini](https://appshunter.io/developer/1893348109) |

## What reviewers say

### Resistor Tools

[App page](https://appshunter.io/ios/app/resistor-tools/id826045228)

This utility app provides a suite of tools for calculating and determining resistor values. It assists hobbyists and engineers with series, parallel, and voltage divider calculations, as well as inverting amplifier gain.

**Highlights:** Series and parallel resistor calculation, Resistor combination finder, Voltage divider ratio and value calculation, Inverting amplifier gain calculation, Save combinations to CSV

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock pro feature | $0.99 | one-time |


### HCC2D Decoder

[App page](https://appshunter.io/ios/app/hcc2d-decoder/id6762202762)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Resistor Tools free?

Resistor Tools is free to download, with in-app purchases available.

### Is HCC2D Decoder free?

HCC2D Decoder is free to download, with no in-app purchases.

### Do Resistor Tools or HCC2D Decoder have ads?

Neither Resistor Tools nor HCC2D Decoder shows ads.

### Which is updated more often, Resistor Tools or HCC2D Decoder?

Resistor Tools ships an update every 2 months, and HCC2D Decoder fortnightly. Most recently, Resistor Tools was updated on September 24, 2026 and HCC2D Decoder on September 3, 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.*