# SJ Resistor Calculator vs Resistor Color Code Reader

The clearest difference is ads: Resistor Color Code Reader at none against SJ Resistor Calculator's shown. SJ Resistor Calculator's advantage is update cadence (every 2 weeks vs every 4 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. SJ Resistor Calculator sells 5 one-off in-app purchases and Resistor Color Code Reader sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

SJ Resistor Calculator ships an update every 2 weeks, Resistor Color Code Reader every 4 weeks. The most recent releases landed on July 18, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | SJ Resistor Calculator | Resistor Color Code Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sj-resistor-calculator/id6504838457/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 4 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 58 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Stephane JAILLIARD](https://appshunter.io/developer/1749751077) | [Ravinderjeet Dhillon](https://appshunter.io/developer/1896491671) |

## What reviewers say

### SJ Resistor Calculator

[App page](https://appshunter.io/ios/app/sj-resistor-calculator/id6504838457)

This tool simplifies resistor calculations for electronics enthusiasts, students, and professionals. It accurately decodes resistor color codes and performs series/parallel calculations for complex circuit analysis. Avoid manual errors and streamline your electronics projects.

**Highlights:** Resistor color code decoding (4, 5, 6 band), Series resistor calculations, Parallel resistor calculations, Accurate resistance and tolerance values, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| A coffee | $0.99 | one-time |
| A cookie | $2.99 | one-time |
| No ads | $4.99 | one-time |
| A lemon tart | $4.99 | one-time |
| A pizza | $9.99 | one-time |


### Resistor Color Code Reader

[App page](https://appshunter.io/ios/app/resistor-color-code-reader/id6799727676)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Workbench Tools | $3.99 | one-time |


## Frequently asked questions

### Is SJ Resistor Calculator free?

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

### Is Resistor Color Code Reader free?

Resistor Color Code Reader is free to download, with in-app purchases available.

### Do SJ Resistor Calculator or Resistor Color Code Reader have ads?

SJ Resistor Calculator shows ads; Resistor Color Code Reader does not.

### Which is updated more often, SJ Resistor Calculator or Resistor Color Code Reader?

SJ Resistor Calculator ships an update every 2 weeks, and Resistor Color Code Reader every 4 weeks. Most recently, SJ Resistor Calculator was updated on July 18, 2026 and Resistor Color Code Reader on October 1, 2026.

---

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