RigMaster: Rigging Calculator
Sling Tension & Load Weight
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
RigMaster is the rigging calculator built for working riggers, crane operators, and signal persons.
LIFT PLAN PDF (PRO)
• Turn any calculation into a one-page lift plan: diagram, inputs, results
• Room for notes and three signature lines — prepared by, signature, date
• Share it straight to the supervisor from the toolbar
IPAD & UNITS
• Universal app — two-column layout on iPad, any orientation
• Metric or imperial — kg and metres or lb and feet, switch any time
• Live sling diagram with the angle and tension on every leg
FREE CALCULATORS
• Sling Tension — 2-leg picks by angle, or by sling length & height (the way you actually measure)
• Hitch Capacity — vertical, choker, and basket capacity from YOUR sling's tag rating
• Angle Reference — the tension multiplier table, always in your pocket
PRO CALCULATORS
• 3 & 4-leg bridles with rigid/flexible load sharing
• Unequal Legs / CoG Offset — tension per leg when the center of gravity isn't centered
• Load Weight Estimator — steel, concrete, aluminum and more, by shape and dimensions
• Ad-free
Built on first-principles trigonometry with warnings at 45° and hard alerts below 30°, following standard rigging practice (ASME B30.9 guidance).
RigMaster is an estimation aid for qualified riggers. Always follow the sling tag, the load chart, and your site's rigging plan.
Terms of Use (EULA): https://ghapps1.wordpress.com/terms-condition/
Privacy Policy: https://ghapps1.wordpress.com/privacy-policy/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
NEW — Lift Plan PDF (Pro)
Turn any calculation into a one-page sheet: the diagram, the numbers it was calculated from, room for notes and three signature lines. Hand that to the supervisor instead of a screenshot.
If RigMaster is doing its job, a rating takes ten seconds and helps other riggers find it.
The developer, Grima Hdez, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Grima Hdez
- Size
- 4.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 13 more
- English, Arabic, Dutch, French, German, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Traditional Chinese, Turkish
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- RigMaster Pro $59.99
- Pro Yearly $29.99
- Pro Weekly $4.99
- Copyright
- © 2026 Grima Hdez All Rights Reserved.