Rigwise: Rigging Calculator

Rigwise is the rigging calculator built for the field — fast, correct, fully offline, and a one-time purchase. No subscription. No account. No internet required. Your data never leaves your phone.

Built for crane riggers, signal persons, ironworkers, and anyone who plans a lift.

THE CALCULATORS (always free)
• Sling Tension — see how the load in each leg climbs as the sling angle drops. Enter the angle, or just the sling length and height. Clear red warning below 30°.
• Working Load Limit — vertical, choker, and basket hitches, with the angle and D/d reduction factors applied.
• Center of Gravity — find how much each pick point actually carries when the load is off-center.
• Crane Capacity % — check your load against the chart capacity, with a warning when you're over.

Every result shows a plain-language safety state, glove-readable, in light or dark.

RIGWISE PRO — the studio (one-time purchase, yours forever)
• Gear inventory — log your slings, shackles, chains, and hooks with their tagged WLL.
• Inspection tracking — Rigwise flags gear that's overdue for inspection before you grab it.
• Lift Plans — save a named lift; Rigwise re-computes the numbers from your inputs so a saved plan is never a stale, hand-typed figure.
• Field-ready export — share a clean lift-plan summary with your crew.

WHY RIGWISE
• Works 100% offline — job sites don't have signal.
• One-time purchase — the tools you paid for keep working, forever.
• Private by design — no account, no tracking, nothing collected.
• Correct — the math is deterministic and exhaustively tested against standard rigging practice.

SAFETY
Rigwise is a calculation aid. Always verify every result against the manufacturer's tag, the load chart, and a qualified person. It is not a substitute for an engineered lift plan or professional judgment. Rigging is inherently hazardous; you are solely responsible for the safety of any lift.