Southwire® Voltage Drop Calc vs Wire Phase
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.
Wire Phase
This utility app helps electricians and DIYers quickly identify and number electrical phases in single and three-phase circuits. It provides color codes for common voltage configurations and allows for easy navigation and bookmarking of circuit numbers.
- Identify 120/240 single phase
- Identify 120/208 three phase
- Identify 277/480 three phase
- Endless scrolling interface
- Jump to circuit number
- Tap to remember place
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Wire Phase helps you identify and number the different phases to their circuit number. * 120/240 single phase (Black, Red) * 120/208 three phase (Black, Red, Blue) * 277/480 three phase (Brown, Orange, Yellow) Pretty dang simple: * Endless scrolling * Type circuit number to immediately jump to the specific phase color * Tap a row to remember your place @@ Big thanks to Chris McDowell
Screenshots
Verdict
The clearest difference is price: Southwire® Voltage Drop Calc at Free against Wire Phase's $0.99. Southwire® Voltage Drop Calc also leads on rating (4.6 vs 2.8) and update cadence (every 2 months vs every 57 months). Wire Phase's advantage is iOS requirement (10.0 vs 15.0). On ads, in-app purchases 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
Southwire® Voltage Drop Calc is free to download; Wire Phase costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Southwire® Voltage Drop Calc holds the better App Store score, 4.6 against 2.8. That said, the two scores are not equally well evidenced: Southwire® Voltage Drop Calc has 1.5K ratings behind it against 10, 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 20% of Wire Phase's.
Southwire® Voltage Drop Calc ships an update every 2 months, Wire Phase every 57 months. The most recent releases landed on October 20, 2026 and October 6, 2026 respectively.
| Parameter | Southwire® Voltage Drop Calc | Wire Phase |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.6 (1.5K ratings) — better | 2.8 (10 ratings) |
| Positive reviews | 48.1% of reviews — better | 20.0% of reviews |
| Number of ratings | 1.5K — better | 10 |
| Update frequency | Every 2 months — better | Every 57 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 10.0 — better |
| Further details — not scored | ||
| Size | 10 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Southwire Company | TRNSFR |
Customer experience
Southwire® Voltage Drop Calc
Wire Phase
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
Wire Phase
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Southwire® Voltage Drop Calc
No in-app purchases
Wire Phase
No in-app purchases
Questions
Is Southwire® Voltage Drop Calc free?
Is Wire Phase free?
Which has better reviews, Southwire® Voltage Drop Calc or Wire Phase?
Do Southwire® Voltage Drop Calc or Wire Phase have ads?
Which is updated more often, Southwire® Voltage Drop Calc or Wire Phase?
Other comparisons
