Southwire® Conduit Fill Calc vs NX Lighting Controls
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Southwire® Conduit Fill Calc
This tool assists electricians, engineers, and contractors in determining the correct conduit size based on NEC guidelines. It calculates conduit fill percentages and jam probability, saving time compared to manual calculations.
- Conduit size calculation
- NEC fill percentages
- Jam probability
- Email results
- Quick navigation
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Southwire has created this great tool to help electricians, engineers and contractors answer the question, “What size conduit do I use” per the NEC®, includes fill percentages and jam probability. If you do not have the NEC book handy or do not want to spend time manually calculating the Conduit Fill %, this is the right app for you. The app provides quick and easy navigation. Enter the Conduit Type and Size and specify your conductors. The App will calculate the Conduit Fill % as per NEC Guidelines. Southwire Company is North America’s leading manufacturer of wire and cable used in the distribution transmission of electricity. Throughout its history, our company has sought to deliver power through our products, our service and by helping empower our customers, employees and communities. The App Answers the question, “What size conduit do I use” includes fill percentages and jam probability per the NEC®. With one click, you can email your results.
NX Lighting Controls
Configure and manage NX lighting control devices wirelessly from your iPhone or iPad. This utility app simplifies the setup process for your smart lighting system.
- Wireless device setup
- Wireless device configuration
- iPhone and iPad compatibility
- Smart lighting management
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This application allows wireless setup and wireless configuration of NX lighting Control devices from an iPhone or iPad.
Screenshots
Verdict
The clearest difference is rating: Southwire® Conduit Fill Calc at 4.5 against NX Lighting Controls's 3.6. Southwire® Conduit Fill Calc also leads on review sentiment (70% vs 33%) and ratings volume (746 vs 27). NX Lighting Controls's advantage is iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
Southwire® Conduit Fill Calc holds the better App Store score, 4.5 against 3.6. That said, the two scores are not equally well evidenced: Southwire® Conduit Fill Calc has 746 ratings behind it against 27, so its average is the more settled of the two. Written reviews point the same way: 70% of Southwire® Conduit Fill Calc's written reviews are positive against 33% of NX Lighting Controls's.
Southwire® Conduit Fill Calc ships an update monthly, NX Lighting Controls every 2 months. The most recent releases landed on September 21, 2026 and August 23, 2026 respectively.
| Parameter | Southwire® Conduit Fill Calc | NX Lighting Controls |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (746 ratings) — better | 3.6 (27 ratings) |
| Positive reviews | 70.2% of reviews — better | 33.3% of reviews |
| Number of ratings | 746 — better | 27 |
| Update frequency | Monthly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 19 MB | 131 MB |
| Age rating | 4+ | 4+ |
| Developer | Southwire Company | Current Lighting Solutions, LLC |
Customer experience
Southwire® Conduit Fill Calc
NX Lighting Controls
Bugs and requests
Southwire® Conduit Fill Calc
Reported bugs
6 issues- Blank white screen on app launch
- Conduit size data erased when changing conduit type
- Inaccurate fill calculations compared to NEC standards
- Jam probability calculations not accurate
- App crashes and fails to display results
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- No method to reload or recover from crashes
Requested features
8 requests- Add 16 & 18 AWG wire sizes
- Include bare solid copper and other conductor types
- Save calculation history/results
- Voltage drop calculator
- Maximum wire count per conduit type calculator
Show 3 moreShow fewer
- Conduit length parameter
- Restore calculate button functionality
- Auto-fill missing fields
NX Lighting Controls
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Southwire® Conduit Fill Calc
No in-app purchases
NX Lighting Controls
No in-app purchases
Questions
Is Southwire® Conduit Fill Calc free?
Is NX Lighting Controls free?
Which has better reviews, Southwire® Conduit Fill Calc or NX Lighting Controls?
Do Southwire® Conduit Fill Calc or NX Lighting Controls have ads?
Which is updated more often, Southwire® Conduit Fill Calc or NX Lighting Controls?
Other comparisons
