NRG Optimizer vs SJ Resistor Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NRG Optimizer
Read full descriptionHide full description
NRG Optimizer is a commercial application designed for Operations professionals looking to improve energy savings through smart control of smart devices like LED lighting, occupancy sensors, daylight sensors, electrical outlets and lighting controls.
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
Read full descriptionHide full description
############################# # 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!
Screenshots
Verdict
The clearest difference is in-app purchases: NRG Optimizer at none against SJ Resistor Calculator's 5. NRG Optimizer also leads on ads (none vs shown) and iOS requirement (12.0 vs 16.0). SJ Resistor Calculator's advantage is update cadence (every 2 weeks vs every 13 months). On price and device support 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. NRG Optimizer asks for nothing beyond the download.
NRG Optimizer ships an update every 13 months, SJ Resistor Calculator every 2 weeks. The most recent releases landed on September 29, 2026 and September 23, 2026 respectively.
| Parameter | NRG Optimizer | SJ Resistor Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 13 months | Every 2 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 154 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | T.G.L. Inc. | Stephane JAILLIARD |
In-app purchases
NRG Optimizer
No in-app purchases
SJ Resistor Calculator
- A coffee$0.99
- A cookie$2.99
- No ads$4.99
Show 2 moreShow fewer
- A lemon tart$4.99
- A pizza$9.99
Questions
Is NRG Optimizer free?
Is SJ Resistor Calculator free?
Do NRG Optimizer or SJ Resistor Calculator have ads?
Which is updated more often, NRG Optimizer or SJ Resistor Calculator?
Other comparisons
