Southwire® Voltage Drop Calc vs Ferret Tools
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.
Ferret Tools
View and record live video from your inspection camera. This app allows you to capture photos and videos of hard-to-reach areas. Requires a separate Ferret inspection camera to function.
- Live video streaming
- Photo capture
- Video recording
- Inspection camera control
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A Ferret inspection camera is required to use this App – sold separately. Need help? Please visit ferrettools.com/support
Screenshots
Verdict
The clearest difference is rating: Southwire® Voltage Drop Calc at 4.6 against Ferret Tools's 3.1. Southwire® Voltage Drop Calc also leads on ratings volume (1.5K vs 23) and review sentiment (49% vs 27%). On price, update cadence, 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® Voltage Drop Calc holds the better App Store score, 4.6 against 3.1. That said, the two scores are not equally well evidenced: Southwire® Voltage Drop Calc has 1.5K ratings behind it against 23, so its average is the more settled of the two. Written reviews point the same way: 49% of Southwire® Voltage Drop Calc's written reviews are positive against 27% of Ferret Tools's.
Southwire® Voltage Drop Calc ships an update every 2 months, Ferret Tools every 6 weeks. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.
| Parameter | Southwire® Voltage Drop Calc | Ferret Tools |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (1.5K ratings) — better | 3.1 (23 ratings) |
| Positive reviews | 49.1% of reviews — better | 26.9% of reviews |
| Number of ratings | 1.5K — better | 23 |
| Update frequency | Every 2 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15 |
| Further details — not scored | ||
| Size | 10 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Southwire Company | The Cable Ferret Company Limited |
Customer experience
Southwire® Voltage Drop Calc
Ferret Tools
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
Ferret Tools
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Southwire® Voltage Drop Calc
No in-app purchases
Ferret Tools
No in-app purchases
Questions
Is Southwire® Voltage Drop Calc free?
Is Ferret Tools free?
Which has better reviews, Southwire® Voltage Drop Calc or Ferret Tools?
Do Southwire® Voltage Drop Calc or Ferret Tools have ads?
Which is updated more often, Southwire® Voltage Drop Calc or Ferret Tools?
Other comparisons
