Pricing

Every calculator is built from published references — Shigley, Roark, VDI 2230, ASTM, IPC — and verified with hand-computed test vectors.

Free

$0

No account needed for the open instruments.

  • 6 open calculators — including Tolerance Stack-Up, PCB Trace Resistance, Resistor Divider
  • Real-time interactive visualization
  • Shareable URLs — inputs encoded in the link
  • CSV and PDF export
Open the instruments

Pro

$9/ month

The full professional instrument set.

  • Everything in Free
  • 5 professional calculators — Beam Analysis, Bolted Joint, Foam Compression, Shaft Fit, and more
  • Full math derivations with cited sources
  • Priority for new instruments and requests

Lifetime

Best value
$150once

Pay once. Yours forever, including everything built later.

  • Everything in Pro, permanently
  • Every calculator added in the future — including ones built from your own requests
  • Request an instrument and it gets built into the deck
  • No subscription — nothing to renew or cancel

Questions, team plans, or a calculator you need? [email protected]