# Resistor vs SJ Resistor Calculator

The clearest difference is in-app purchases: Resistor at none against SJ Resistor Calculator's 5. Resistor also leads on ads (none vs shown) and ratings volume (19 vs 1). SJ Resistor Calculator's advantage is update cadence (every 2 weeks vs every 9 months) and iOS requirement (16.0 vs 26.0). On price, rating and device support there is nothing between them.

Both are free to download. SJ Resistor Calculator sells 5 one-off in-app purchases. Resistor asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for Resistor against 5.0 for SJ Resistor Calculator. That said, the two scores are not equally well evidenced: Resistor has 19 ratings behind it against 1, so its average is the more settled of the two.

Resistor ships an update every 9 months, SJ Resistor Calculator every 2 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Resistor | SJ Resistor Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (19 ratings)](https://appshunter.io/ios/app/resistor-converter/id6446839759/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sj-resistor-calculator/id6504838457/reviews)** |
| Number of ratings | **19** | 1 |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 8 MB | 4 MB |
| Requires iOS | 26.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gerhard Lentschik](https://appshunter.io/developer/629988041) | [Stephane JAILLIARD](https://appshunter.io/developer/1749751077) |

## What reviewers say

### Resistor

[App page](https://appshunter.io/ios/app/resistor-converter/id6446839759)

Quickly calculate resistor values from color bands or SMD codes, and vice versa. This tool is ideal for electronics enthusiasts, students, and DIYers working with 4, 5, or 6-band resistors and various SMD codes. It functions offline and requires no registration.

**Highlights:** Calculate resistor values from color bands, Convert resistor values to color bands, Supports 4, 5, and 6-band resistors, Handles SMD codes (EIA-3, EIA-4, EIA-96), Works offline, No registration required

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

**In-app purchases:** none


### 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, Vision Pro support

**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 |


## Frequently asked questions

### Is Resistor free?

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

### Is SJ Resistor Calculator free?

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

### Which has better reviews, Resistor or SJ Resistor Calculator?

SJ Resistor Calculator is rated higher. Resistor averages 4.9 out of 5 from 19 ratings, while SJ Resistor Calculator averages 5.0 from 1 ratings.

### Do Resistor or SJ Resistor Calculator have ads?

SJ Resistor Calculator shows ads; Resistor does not.

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

Resistor ships an update every 9 months, and SJ Resistor Calculator every 2 weeks. Most recently, Resistor was updated on November 3, 2026 and SJ Resistor Calculator on October 30, 2026.

---

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