# SJ Resistor Calculator vs Lux Light Meter

The clearest difference is ads: Lux Light Meter at none against SJ Resistor Calculator's shown. Lux Light Meter also leads on ratings volume (5 vs 1). On price, rating, update cadence and in-app purchases there is nothing between them.

Both are free to download. SJ Resistor Calculator sells 5 one-off in-app purchases and Lux Light Meter sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for SJ Resistor Calculator against 5.0 for Lux Light Meter. That said, the two scores are not equally well evidenced: Lux Light Meter has 5 ratings behind it against 1, so its average is the more settled of the two.

SJ Resistor Calculator ships an update every 2 weeks, Lux Light Meter fortnightly. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | SJ Resistor Calculator | Lux Light Meter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/sj-resistor-calculator/id6504838457/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/lux-light-meter-illuminance/id6790679680/reviews) |
| Number of ratings | 1 | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Fortnightly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 4 MB | 4 MB |
| Requires iOS | **16.0** | 17 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Stephane JAILLIARD](https://appshunter.io/developer/1749751077) | [灿耿 陈](https://appshunter.io/developer/1688324562) |

## 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, 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 |


### Lux Light Meter

[App page](https://appshunter.io/ios/app/lux-light-meter-illuminance/id6790679680)

Measure ambient light levels with your iPhone. Get real-time lux and foot-candle readings, with specialized modes for photography and plant care. Track light history and calibrate for accuracy.

**Highlights:** Ambient light metering (lux/fc), Photography exposure suggestions, Plant light (PPFD/DLI) estimation, Continuous measurement and history, Optional meter calibration, Privacy-friendly local storage

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Access | $1.99 | per 7 days |
| Annual Subscription | $7.99 | per year |
| Lifetime Access | $12.99 | one-time |


## Frequently asked questions

### Is SJ Resistor Calculator free?

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

### Is Lux Light Meter free?

Lux Light Meter is free to download, with in-app purchases available.

### Which has better reviews, SJ Resistor Calculator or Lux Light Meter?

SJ Resistor Calculator and Lux Light Meter are both rated 5.0 out of 5 on the App Store, from 1 and 5 ratings respectively.

### Do SJ Resistor Calculator or Lux Light Meter have ads?

SJ Resistor Calculator shows ads; Lux Light Meter does not.

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

SJ Resistor Calculator ships an update every 2 weeks, and Lux Light Meter fortnightly. Most recently, SJ Resistor Calculator was updated on November 4, 2026 and Lux Light Meter on November 5, 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.*