Southwire® Voltage Drop Calc vs VDrop
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Southwire® Voltage Drop Calc
Calculate the appropriate wire size for electrical circuits. This tool helps determine wire size based on voltage drop and current carrying capacity, ensuring compliance with NEC ampacity limits.
- Determine wire size for voltage drop
- Calculate voltage drop for conductor runs
- Limit wire size by voltage drop
- Limit wire size by NEC ampacity
- Supports AWG and KCMIL sizes
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Southwire's voltage drop calculator will help you determine the proper wire size for an electrical circuit based on the voltage drop and current carrying capacity of an electrical circuit. Determines wire size to meet specific voltage drop limits or calculates voltage drop for a specific conductor run. When sizing conductors, calculations limits wire size to voltage drop and NEC ampacity. Southwire's Voltage Drop Calculator is designed for applications using AWG and KCMIL sizes only.
VDrop
This utility calculates voltage drop for electrical systems up to 600V. It provides detailed calculation outputs to help users verify results and build confidence in their electrical work. Custom voltage inputs are supported.
- Voltage drop calculations
- Supports up to 600V
- Custom voltage input
- Detailed calculation outputs
- User confidence building
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600V and less voltage drop calculator. Outputs provide the user details from the calculations to allow users to perform due diligence and develop confidence in the results. Custom voltages may be inputted (600V and less) also.
Screenshots
Verdict
The clearest difference is review sentiment: VDrop at 100% against Southwire® Voltage Drop Calc's 48%. VDrop also leads on rating (5.0 vs 4.6) and iOS requirement (10.0 vs 15.0). Southwire® Voltage Drop Calc's advantage is update cadence (every 2 months vs every 13 months) and ratings volume (1.5K vs 3). 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.
VDrop holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Southwire® Voltage Drop Calc has 1.5K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 48% of Southwire® Voltage Drop Calc's written reviews are positive against 100% of VDrop's.
Southwire® Voltage Drop Calc ships an update every 2 months, VDrop every 13 months. The most recent releases landed on September 17, 2026 and June 1, 2026 respectively.
| Parameter | Southwire® Voltage Drop Calc | VDrop |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (1.5K ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 48.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 1.5K — better | 3 |
| Update frequency | Every 2 months — better | Every 13 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 10.0 — better |
| Further details — not scored | ||
| Size | 10 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Southwire Company | Nebulous LLC |
Customer experience
Southwire® Voltage Drop Calc
VDrop
Bugs and requests
Southwire® Voltage Drop Calc
Reported bugs
24 issues- Useless!
- Won't work
- How to use
- Confused
- Bad app
Show 19 moreShow fewer
- Bad
- Not applicable for Residential
- Electrician
- Terrible
- Not working
- What??
- Terrible
- Don't work
- Terrible
- Choice Between AWG and Metric wire Gauge
- Updated app not so simple
- The last version was better
- App
- Terrible
- Voltage drop calculator
- IOS 8
- One flaw
- Worst app ever
- Average
Requested features
2 requests- Motor starting Voltage drop calculation
- Metric wire size options
VDrop
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Southwire® Voltage Drop Calc
No in-app purchases
VDrop
No in-app purchases
Questions
Is Southwire® Voltage Drop Calc free?
Is VDrop free?
Which has better reviews, Southwire® Voltage Drop Calc or VDrop?
Do Southwire® Voltage Drop Calc or VDrop have ads?
Which is updated more often, Southwire® Voltage Drop Calc or VDrop?
Other comparisons
