Southwire® Conduit Fill Calc vs Leviton Smart Sensor
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.
Leviton Smart Sensor
Configure and interact with Leviton Smart Sensor products. Tailor sensor settings to specific space requirements and comply with energy codes. Suitable for installers, building maintenance, and end-users.
- Configure smart sensor products
- Set space requirements
- Comply with energy codes
- Interact with sensors
- Suitable for installers and end-users
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This app can be used to interact with any of Leviton’s Smart Sensor products. The application allows user’s to configure the sensor based on the requirements for the space and per the industry’s latest energy code requirements. Application is appropriate to be used by installers, building maintainers, and end-users.
Screenshots
Verdict
The clearest difference is rating: Southwire® Conduit Fill Calc at 4.5 against Leviton Smart Sensor's 3.9. Southwire® Conduit Fill Calc also leads on update cadence (monthly vs every 5 months) and ratings volume (746 vs 9). Leviton Smart Sensor's advantage is iOS requirement (13.0 vs 15.6). On price, review sentiment, ads 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. 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 3.9. That said, the two scores are not equally well evidenced: Southwire® Conduit Fill Calc has 746 ratings behind it against 9, 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 67% of Leviton Smart Sensor's.
Southwire® Conduit Fill Calc ships an update monthly, Leviton Smart Sensor every 5 months. The most recent releases landed on September 21, 2026 and September 11, 2026 respectively.
| Parameter | Southwire® Conduit Fill Calc | Leviton Smart Sensor |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (746 ratings) — better | 3.9 (9 ratings) |
| Positive reviews | 70.2% of reviews — better | 66.7% of reviews |
| Number of ratings | 746 — better | 9 |
| Update frequency | Monthly — better | Every 5 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 | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Southwire Company | Leviton Manufacturing Co. Inc. |
Customer experience
Southwire® Conduit Fill Calc
Leviton Smart Sensor
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
Leviton Smart Sensor
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Southwire® Conduit Fill Calc
No in-app purchases
Leviton Smart Sensor
No in-app purchases
Questions
Is Southwire® Conduit Fill Calc free?
Is Leviton Smart Sensor free?
Which has better reviews, Southwire® Conduit Fill Calc or Leviton Smart Sensor?
Do Southwire® Conduit Fill Calc or Leviton Smart Sensor have ads?
Which is updated more often, Southwire® Conduit Fill Calc or Leviton Smart Sensor?
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