Southwire® Voltage Drop Calc vs CMC Swift
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.
CMC Swift
Control Omicron CMCs to output analog voltages and currents, feed in binary signals, or measure them. Perform wiring and control system checks, as well as trip tests for protective functions quickly and easily. It also facilitates polarity checks when used with a handheld CPOL device.
- Output analog voltages and currents
- Feed in binary signals
- Measure binary signals
- Perform wiring and control system checks
- Conduct trip tests for protective functions
- Perform polarity checks with CPOL device
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For more information how to get started, visit https://www.omicronenergy.com/cmcswift With CMC Swift you can output analog voltages and currents via your CMC, feed in binary signals or measure them. Wiring and control system checks as well as pickup and trip tests of protective functions, such as overcurrent protection, can be performed quickly and easily. In combination with a handheld CPOL device, polarity checks can be easily performed.
Screenshots
Verdict
The clearest difference is rating: CMC Swift at 5.0 against Southwire® Voltage Drop Calc's 4.6. Southwire® Voltage Drop Calc's advantage is ratings volume (1.5K vs 1) and update cadence (every 2 months vs every 4 months). 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.
CMC Swift 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 1, so its average is the more settled of the two.
Southwire® Voltage Drop Calc ships an update every 2 months, CMC Swift every 4 months. The most recent releases landed on September 17, 2026 and July 5, 2026 respectively.
| Parameter | Southwire® Voltage Drop Calc | CMC Swift |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (1.5K ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 48.1% of reviews | — |
| Number of ratings | 1.5K — better | 1 |
| Update frequency | Every 2 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 10 MB | 127 MB |
| Age rating | 4+ | 4+ |
| Developer | Southwire Company | OMICRON electronics GmbH |
Customer experience
Southwire® Voltage Drop Calc
CMC Swift
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
CMC Swift
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Southwire® Voltage Drop Calc
No in-app purchases
CMC Swift
No in-app purchases
Questions
Is Southwire® Voltage Drop Calc free?
Is CMC Swift free?
Which has better reviews, Southwire® Voltage Drop Calc or CMC Swift?
Do Southwire® Voltage Drop Calc or CMC Swift have ads?
Which is updated more often, Southwire® Voltage Drop Calc or CMC Swift?
Other comparisons
