Rigging Sling Angle Calculator

Leg Tension & Design Factor

$0.99 · Designed for iPad. Not verified for macOS.

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About to pick a load with a multi-leg sling and need to verify the tension per leg is within safe limits? Exceeding the sling angle threshold can cause catastrophic failure. This app computes angle, tension per leg, and design factor for 2, 3, and 4-leg configurations instantly. Enter load weight, sling length, and vertical height. Get sling angle from vertical, tension per leg, design factor, and pass/fail check against the 60° angle limit. WHAT IT CALCULATES: - Sling angle from vertical - Tension per leg for 2, 3, and 4-leg configurations - Total tension across all legs - Design factor (total tension ÷ load weight) - Pass/fail safety check SLING CONFIGURATION: - Multi-leg bridle (2, 3, 4 legs) - Metric (kg/m) and Imperial (lb/ft) units KEY FEATURES: - Built-in sling angle reference table - Color-coded safety status - Works completely offline - No account or login required Built for riggers, crane operators, ironworkers, and safety officers.

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Optimized for iPhone Duo and iPad: on wide screens, inputs and results now sit side by side so you can see the answer change as you type. Built with the iOS 27 SDK.

Version 1.0.5

The developer, Shanghai Sheyuan Network Technology Co., Ltd., 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 Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    Shanghai Sheyuan Network Technology Co., Ltd.
    Size
    1 MB
    Category
    Utilities
    Compatibility
    Requires iOS 26.2 or later.
    • iPhone
      Requires iOS 26.2 or later.
    • iPad
      Requires iPadOS 26.2 or later.
    • Mac
      Requires macOS 26.2 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.2 or later.
    Languages
    English
    Age Rating
    4+
    Copyright
    © 2026 Sheyuan Inc.
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

    More by Shanghai Sheyuan Network Technology Co., Ltd.