Voltly
Field calcs you'd wire to — code cited, all offline.
Code-true electrical answers on any job — voltage drop, ampacity, conduit fill, box fill, bending — each citing the NEC article, 100% offline.
Voltly
productivity
Field calcs you'd wire to — code cited, all offline
What you get
Voltly was built for exactly this.
The core features that make Voltly different from the generic alternatives.
Stop second-guessing your numbers — eight field calculators on one glove-friendly hub
Voltage Drop, Wire Ampacity, Conduit Fill, Box Fill, Conduit Bending, Motor FLC, a converter suite and Ohm's Law. Voltage Drop and Ohm's Law are free; the rest unlock with Pro.
Wire to the number with confidence — every result names the NEC article behind it (Table 310.16 ampacity, 314.16 box fill, Chapter 9 conduit fill), so you can defend the answer to any inspector.
Size conductors right the first time — Voltage Drop runs 1Ø/3Ø in copper or aluminum, flags anything over the 3% recommendation and suggests the upsize; Wire Ampacity uses Table 310.16 with selectable 60/75/90°C termination columns and derate factors.
Bend it once — offset, three-point saddle and 90° stub math hand you the marks before you reach for the bender, so you stop scrapping conduit.
Skip the conversion math — Motor FLC returns full-load amps with 125% conductor and OCPD sizing, plus a converter suite for units, AWG↔mm² and kVA.
Look up code with zero bars — an offline NEC reference of the tables and articles electricians check daily, in plain language with the article number cited; works in basements, panel rooms and steel buildings with no signal and no account.
Never lose a calc — save results into jobs organized by site, panel or circuit in an on-device store; the free tier keeps your last 5, Voltly Pro is unlimited.
Hand off clean paperwork — export any result as a labeled PDF job sheet and turn on iCloud sync (both Pro); tune theme, accent, imperial/metric units and NEC edition (2020 / 2023 / 2026) in settings.
A look inside
See it in your hands.
A note from the studio
“Electricians work gloved, in bad light, in dead zones — and still pay for a drawer of dated, single-trick apps to get one number. I wanted a single instrument that's fast, fully offline, and cites the code on every result, so you can wire to the answer and prove it to the inspector. That's all Voltly is: the whole drawer, done right, in one app.”
How it works
Three steps. No account. No tracking.
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Notify me when Voltly ships.
It'll launch at $9.99. Free tier: voltage drop and ohm's law calculators, free-tier nec entries, and the last 5 saved calcs — no account, fully offline..
One email when it lands on the App Store. No drip sequence.
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From the journal
Notes on the practice.
- 01
200 Amp Service Wire Size: The 83% Rule That Lets a "Too Small" Wire Feed Your Whole House
What size wire for a 200 amp service? The NEC's 83% rule lets 2/0 copper carry it all — here's the load-diversity physics that makes an undersized wire legal.
2026-07-13
7 min read
- 02
Open Neutral Symptoms: The One Electrical Failure No Breaker Can See
Open neutral symptoms — lights blazing in one room, dim in another, electronics dying — trace to a single failed wire. Here's the physics, and how to test for it.
2026-07-12
7 min read
- 03
Bootleg Ground: The Fake Ground That Fools Every Outlet Tester
A bootleg ground makes a three-light outlet tester read 'correct' on a receptacle that can put 120 volts on an appliance's metal skin. Here's how to find one.
2026-07-12
7 min read
- 04
What a Ground Rod Actually Does: Why Eight Feet of Copper in the Dirt Can't Trip a Breaker
What a ground rod actually does — and why it will never trip a breaker. The Ohm's law math behind NEC 250.53, and the wire that really protects you from shock.
2026-07-11
7 min read
- 05
Backfeeding a Generator: Why a Double-Male Cord Can Kill a Lineman Half a Mile Away
Backfeeding a generator through a dryer outlet can push 7,200 volts onto a line crews believe is dead. The physics — and the one-sentence NEC rule that prevents it.
2026-07-11
7 min read
The dispatch
A dispatch from the studio.
One short letter every few weeks. What we launched, what we cut, what we learned. No tracking pixels. Unsubscribe in one click.
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