SJ Resistor Calculator vs Lux Light Meter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SJ Resistor Calculator
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.
- Resistor color code decoding (4, 5, 6 band)
- Series resistor calculations
- Parallel resistor calculations
- Accurate resistance and tolerance values
- User-friendly interface
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############################# # SJ RESISTOR CALCULATOR # ############################# Never misread your electronic components again! SJ Resistor Calculator is the essential tool for professionals, students, and electronics enthusiasts. No more color code errors or tedious calculations for your circuits! +----------------------------------------+ | WHY CHOOSE THIS APP | +----------------------------------------+ [ INTUITIVE DECODING ] - Instantly read 4, 5, or 6-band resistors. - Get the exact value and tolerance effortlessly. [ SERIES CALCULATIONS ] - Calculate the equivalent resistance of your series circuits. - Add as many components as you need. [ PARALLEL CALCULATIONS ] - Easily analyze the behavior of your parallel circuits. - Absolute precision for your electrical designs. [ PROFESSIONAL RELIABILITY ] - A clean, ergonomic, and straightforward interface. - Designed for maintenance, studies, and troubleshooting. Free and available in your language, download it today!
Lux Light Meter
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.
- Ambient light metering (lux/fc)
- Photography exposure suggestions
- Plant light (PPFD/DLI) estimation
- Continuous measurement and history
- Optional meter calibration
- Privacy-friendly local storage
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Lux Light Meter: Illuminance A practical lux and illuminance meter for iPhone. Measure ambient light in seconds, check if a room is bright enough for study, work, or home use, and get helpful exposure and plant-lighting guidance when you need it. Core metering works offline. Key Features: Ambient light metering - Live lux / fc readings with scene targets that tell you if the light is too dim, about right, or too bright — plus simple tips to adjust Photography mode (Pro) - Aperture- or shutter-priority suggestions with ISO and exposure compensation so you can dial in exposure faster Plant mode (Pro) - Estimate PPFD and DLI for common houseplants, with light source and daily photoperiod options Continuous measure & history - Save single readings, track how light changes over time, and review min, average, and max values Optional calibration - Fine-tune against a trusted meter; Pro saves separate factors for the front and rear cameras Units & privacy-friendly storage - Switch between lux and fc; your measurements stay on your device How to Use: Open the app, allow camera access, and point your iPhone at the area you want to measure. Switch between Environment, Photography, and Plant modes, then save a reading or run a continuous measurement when you need a longer sample. Subscription Options: * Weekly and yearly subscriptions, plus a lifetime purchase * Payment will be charged to your Apple ID account * Subscriptions renew automatically within 24 hours before the current period ends * Manage or cancel anytime in your Account Settings Clearer readings. Better light decisions. Terms of Use: https://lightmeter.xzonesoft.com/terms.html Privacy Policy: https://lightmeter.xzonesoft.com/privacy.html Contact Us: support@xzonesoft.com
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | SJ Resistor Calculator | Lux Light Meter |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (5 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 5 — better |
| Update frequency | Every 2 weeks — better | Fortnightly |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 17 |
| Further details — not scored | ||
| Size | 4 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Stephane JAILLIARD | 灿耿 陈 |
Customer experience
SJ Resistor Calculator
Lux Light Meter
In-app purchases
SJ Resistor Calculator
- A coffee$0.99
- A cookie$2.99
- No ads$4.99
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- A lemon tart$4.99
- A pizza$9.99
Lux Light Meter
- Weekly Access$1.997 Days
- Annual Subscription$7.991 Year
- Lifetime Access$12.99
Questions
Is SJ Resistor Calculator free?
Is Lux Light Meter free?
Which has better reviews, SJ Resistor Calculator or Lux Light Meter?
Do SJ Resistor Calculator or Lux Light Meter have ads?
Which is updated more often, SJ Resistor Calculator or Lux Light Meter?
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