Wire sizing, voltage drop, overcurrent, the one-line and the bill of materials — assembled into one PDF, with every value traceable to the NEC or ABYC section it came from. The calculators are free either way.
All prices in USD · 14-day trial on subscriptions · cancel anytime
Free USD
no card, forever
Every single-run calculator, with code citations — no signup, forever. We never paywall the math.
$79 USD
one-time · no subscription
The full code-cited documentation pack — residential EV charger and panel upgrades (NEC 220.83 / 220.87), plus off-grid, RV/van, marine and solar+storage.
$290/yr USD
≈$25/mo billed annually · or $39/mo month-to-month
For the one-person shop. Unlimited work, one price.
$790/yr USD
≈$66/mo billed annually · or $99/mo month-to-month
For the shop that hands documents to a client: your branding on the page, and the exports to back it up.
✓ 30-day money-back, plus free regeneration & revisions for 90 days.
✓ Your price never increases while you're subscribed.
$190/yr USD · Solo, locked for life
In exchange: a 15-minute onboarding call, and permission to request a testimonial or short case study after your first accepted document.
Offer ends at 100 founding accounts or Dec 31 2026, whichever comes first.
Claim a founding spotNo. The Compliance Pack is a one-time purchase per project. Build your design on the free tools, then buy the document when you need the paper — for an installer, an insurer, or an inspection. Spend it on documents first and it credits your first subscription invoice.
Yes, and it has no signup. Every single-run calculator is free forever with its code citations. Signing up free adds saved projects and watermarked previews.
Yes. Manage your plan in Billing — no contracts. Subscriptions carry a 30-day money-back guarantee, and documents come with free regeneration and revisions for 90 days.
No. Your price never increases while you are subscribed. When list prices rise they rise for new customers only.