VoltReflex vs BuildWire Calc

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

VoltReflex compared with BuildWire Calc
Detail	VoltReflex	BuildWire Calc
What it does	Free online reaction time test that measures your reflex speed in milliseconds	Offline calculators for electricians, builders and HVAC technicians
Stage	Not given	Not given
Founded	Not given	Not given
Based in	US	US
Pricing model	Free	Freemium
Pricing	Not given	Free: nine calculators (voltage drop, Ohm's law, watts to amps, concrete slab, roof pitch, board feet, BTU, CFM, BTU to kW), no time limit. Pro: $9.99 per year or $19.99 lifetime (one payment, no renewal).
Key features	Reaction time measured in milliseconds Sessions of 5, 10 or 20 rounds Best and average score tracking Percentile comparison with online-test benchmarks Shareable score card and friend challenge link Light and dark mode Works on mobile, tablet and desktop No registration or download required Random delay prevents anticipation	Wire sizing and voltage drop calculations Conduit fill and box fill calculations Offline operation with no network required Transparent calculation steps and NEC warnings Job organization and PDF/CSV export Motor and generator sizing calculators Power and conversion calculators Building calculations for concrete and roof pitch No ads and no account required Private with data staying on device
What makes it different	No sign-up, download, or account required Does not collect or store personal data Sub-millisecond timer precision using browser performance API Benchmarks against pro gamers, trained athletes, and average adults Fast and clean interface without ads	Works completely offline with no network or cellular signal required Private by design with no account, no ads, and calculations never leaving your device Shows exact NEC formulas and calculation steps so you can verify results before fieldwork Over 35 specialized calculators covering electrical, building and HVAC trades Tested code with automated tests against independently worked examples
Community votes	0	0
DR (Domain Rating by Ahrefs)	Not checked yet no change since last check	Not checked yet no change since last check
Trust Flow (Majestic)	0	0
Citation Flow (Majestic)	12	13
Referring domains (Majestic)	3	1

5 details filled in for both companies.

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