# SJ Resistor Calculator vs Voltage Calculator

The clearest difference is in-app purchases: Voltage Calculator at none against SJ Resistor Calculator's 5. Voltage Calculator also leads on ads (none vs shown). On price, update cadence, 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. Voltage Calculator asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on July 18, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | SJ Resistor Calculator | Voltage Calculator |
| --- | --- | --- |
| 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 | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 72 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Stephane JAILLIARD](https://appshunter.io/developer/1749751077) | [ESDEV Teknoloji](https://appshunter.io/developer/1693053468) |

## 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 |


### Voltage Calculator

[App page](https://appshunter.io/ios/app/voltage-calculator/id6790529321)

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

**In-app purchases:** none


## Frequently asked questions

### Is SJ Resistor Calculator free?

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

### Is Voltage Calculator free?

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

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

SJ Resistor Calculator shows ads; Voltage Calculator does not.

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

SJ Resistor Calculator ships an update every 2 weeks, and Voltage Calculator every 2 weeks. Most recently, SJ Resistor Calculator was updated on July 18, 2026 and Voltage Calculator on September 15, 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.*