Building Wire Selector vs FieldVolt Electrical
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Building Wire Selector
This tool helps determine the correct conductor size and wire type for electrical installations. It adheres to the National Electrical Code® wiring methods, ensuring compliance and safety.
- Conductor size determination
- Wire and cable type selection
- National Electrical Code compliance
- Electrical installation guidance
Read full descriptionHide full description
Southwire's Building Wire Selector determines the minimum conductor size and the best wire and cable type for a particular installation, following the National Electrical Code® wiring methods.
FieldVolt Electrical
This app assists electricians with complex calculations for pipe bending, conduit fill, ampacity, voltage drop, and box fill. It also offers a professional subscription for expert electrical advice and troubleshooting.
- Pipe bending calculations (offsets, saddles)
- Conduit fill calculations (NEC Table 1)
- Ampacity and wire sizing
- Voltage drop calculations
- Box fill calculations (NEC 314.16)
- Expert electrical advice subscription
Read full descriptionHide full description
Built by a licensed electrician for work in the field. PIPE BENDING Offsets, 3-bend saddles, 4-bend saddles, rolled offsets, back-to-back 90s, and parallel offsets. Mark placement calculated from the working end. Shrink, gain, spacing — all of it. CONDUIT FILL NEC Table 1 calculations for mixed wire fills. Add conductors, get fill percentage. AMPACITY Wire sizing and derating for ambient temperature, number of current-carrying conductors, and conduit type. VOLTAGE DROP Feeder and branch circuit voltage drop for single-phase and three-phase systems. BOX FILL NEC 314.16 calculations for device, conductor, clamp, and support fitting fill. FIELDVOLT PRO Ask electrical questions, get straight answers. Code interpretation, troubleshooting, load calc logic — the kind of thinking you'd get from someone who's been in the trade for 30 years. 5 free sessions included. Pro subscription available at $4.99/month or $50/year. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Building Wire Selector at none against FieldVolt Electrical's 2. FieldVolt Electrical's advantage is iOS requirement (13.0 vs 16.6). On price, rating, ratings volume and update cadence 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. FieldVolt Electrical sells 2 in-app purchases, starting at $4.99 per month. Building Wire Selector asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Building Wire Selector against 5.0 for FieldVolt Electrical. Both are backed by a comparable volume of ratings — 2 and 1 respectively.
Building Wire Selector ships an update every 5 months, FieldVolt Electrical every 2 months. The most recent releases landed on September 29, 2026 and September 27, 2026 respectively.
| Parameter | Building Wire Selector | FieldVolt Electrical |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 5 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 66 MB |
| Age rating | 4+ | 4+ |
| Developer | Southwire Company | MATTHEW DAVID KOVALIK |
Customer experience
Building Wire Selector
FieldVolt Electrical
In-app purchases
Building Wire Selector
No in-app purchases
FieldVolt Electrical
- FieldVolt Pro$4.991 Month
- FieldVolt Pro$49.991 Year
Questions
Is Building Wire Selector free?
Is FieldVolt Electrical free?
Which has better reviews, Building Wire Selector or FieldVolt Electrical?
Do Building Wire Selector or FieldVolt Electrical have ads?
Which is updated more often, Building Wire Selector or FieldVolt Electrical?
Other comparisons
