E vs Building Wire Selector
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
E
This tool helps determine technical characteristics of enamelled copper wire based on industry standards. It offers functions for diameter conversion, resistance calculations, and breakdown voltage.
- Diameter conversion (mm, inch, AWG)
- Resistance calculation
- Metal wire diameter calculation
- Resistance tolerance
- Enamelled copper quantity and length
- Breakdown voltage
- Winding tension calculation
- Overall diameter tolerance
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E-Wire Calc is an enamelled copper wire (magnet wire) tool based on the industry standards IEC, NEMA or JIS. It provides several functions for the determination of various technical characteristics of the wire in the range 0,010 - 0,8 mm or AWG 58 - 20 respectively. The function DIAMETER allows the conversion of mm, inch and AWG The function RESISTANCE shows the nominal resistance for the given bare copper wire according to the set standard or calculates the diameter for the given resistance respectively The function METALS allows the calculation of bare wire diameters of different metals for a given resistance. The function RESISTANCE TOLERANCE shows the minimal and maximal permitted resistance for a given nominal copper wire diameter according to the set standard. The function SIZES calculates the quantity of enamelled copper for a selected unit of length, the length for a selected unit of quantity and the cross section for a given bare wire and outer diameter. The function BREAKDOWN VOLTAGE shows the minimum voltage of an enamelled copper wire with a given nominal diameter for different addition / increase classes. The function WINDING TENSION calculates the maximal winding tension in cN recommended by ELEKTRISOLA for a given nominal copper wire diameter. The function OVERALL DIAMETER TOLERANCE shows the minimal and maximal permitted outer diameter for an enamelled wire with a given nominal diameter in different addition / increase classes according to the set standard.
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
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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.
Screenshots
Verdict
The clearest difference is update cadence: Building Wire Selector at every 5 months against E's every 18 months. E's advantage is iOS requirement (13.0 vs 16.6). On price, rating, ratings volume and ads 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.
On the App Store both sit at effectively the same score — 5.0 for E against 5.0 for Building Wire Selector. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
E ships an update every 18 months, Building Wire Selector every 5 months. The most recent releases landed on September 12, 2026 and August 30, 2026 respectively.
| Parameter | E | Building Wire Selector |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (2 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 18 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 26 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | ELEKTRISOLA | Southwire Company |
Customer experience
E
Building Wire Selector
In-app purchases
E
No in-app purchases
Building Wire Selector
No in-app purchases
Questions
Is E free?
Is Building Wire Selector free?
Which has better reviews, E or Building Wire Selector?
Do E or Building Wire Selector have ads?
Which is updated more often, E or Building Wire Selector?
Other comparisons
