# Rigging Calculator: Sling Load — Sling Angle, Bridle, Lift Plan

> Sling Angle, Bridle, Lift Plan (iPhone/iPad app by Grima Hdez.)

- Source: https://appshunter.io/ios/app/rigging-calculator-sling-load/id6789944360 (this page in markdown: same URL + `.md`)
- Developer: [Grima Hdez](https://appshunter.io/developer/1741481582)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 5 MB
- Languages: Arabic, Catalan, Croatian, Czech, Danish, Dutch, English, Finnish, French, German and 23 more
- Released: 2026-07-19
- Data updated: 2026-11-13

## What is Rigging Calculator?

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 (reduced by the choke angle) 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
• Horizontal pull per leg — the compression a spreader beam has to carry
• 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.

COMMON QUESTIONS
Does it work offline?
Yes. Every calculation runs on the phone. No signal needed on site.

Do I need an account?
No. There is no login and no sign-up.

What is free?
Sling Tension, Hitch Capacity and the Angle Reference table are free. Pro adds 3 and 4-leg bridles, unequal legs with CoG offset, the load weight estimator and the lift plan PDF, and removes the ads.

Metric or imperial?
Both, switchable at any time — kg and metres, or lb and feet.

Can I hand the result to the supervisor?
Yes. Pro turns any calculation into a one-page lift plan PDF: diagram, inputs, results, notes and three signature lines.

Does it replace the sling tag or the load chart?
No. It is an estimation aid for qualified riggers. The sling tag, the load chart and your site's rigging plan always come first.

Does it work on iPad?
Yes. Universal app, two-column layout on iPad, any orientation.

Terms of Use: https://ghapps1.wordpress.com/terms-condition/
Privacy Policy: https://ghapps1.wordpress.com/privacy-policy/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro Weekly | $0.99 | per 7 days |
| Pro Yearly | $19.99 | per year |
| RigMaster Pro Monthly | $2.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| RigMaster Pro | $39.99 | one-time |


## Is Rigging Calculator safe?

Not enough ratings yet to assess Rigging Calculator.

## Is Rigging Calculator legit?

Rigging Calculator: Sling Load appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Rigging Calculator is 75 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.8.1 — 2026-11-12

Now available in 39 languages. Small improvements.

### 1.8.0 — 2026-10-31

• Clearer Pro screen: the plans are now called One Lift, One Job, Season and Lifetime, and every price shows its billing period (per week, per month, per year or one-time payment).
• Tidier Settings screen.
• Text fixes in 24 languages.

### 1.7.0 — 2026-10-26

• Translations corrected with the real rigging terms (sling, hitch, choker, center of gravity, lift plan) in Thai, Vietnamese, Indonesian, Hindi and Polish.
• The "Pro restored" message now reads correctly in Russian, Turkish, Arabic, Thai, Vietnamese, Indonesian, Hindi and Polish.
• RigMaster now has App Store pages in Russian, Turkish, Thai, Vietnamese, Indonesian, Arabic, Hindi and Polish.

### 1.6.0 — 2026-10-14

• Choker hitch capacity now follows the choke angle (ASME B30.9 reduction factors) instead of a fixed 75%.
• New: horizontal pull per leg, the force a spreader beam carries as compression.
• New monthly plan next to the weekly, yearly and lifetime ones.
• More apps from us in Settings.

### 1.5.0 — 2026-09-16

Corrected the rigging terminology inside the app. Several languages had been machine-translated with the wrong sense of the word: "sling" came out as the catapult, "leg" as the body part, "hitch" as a jerk, and in one language "unequal legs" read as "equal legs" — on the screen that splits the load between uneven legs. Thirty-two terms rewritten by hand across seven languages.

## Apps similar to Rigging Calculator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Rigwise: Rigging Calculator](https://appshunter.io/ios/app/rigwise-rigging-calculator/id6780810237) | — | Free | Utilities |
| [RigCalcPro: Rigging Calculator](https://appshunter.io/ios/app/rigcalcpro-rigging-calculator/id6794874495) | — | Free | Utilities |
| [RigThis](https://appshunter.io/ios/app/rigthis/id6770800479) | 5.0 (1) | Free | Utilities |
| [Pocket Rigger](https://appshunter.io/ios/app/pocket-rigger/id6744535560) | — | Free | Utilities |
| [Sling Load Calculator Easy](https://appshunter.io/ios/app/sling-load-calculator-easy/id6762073651) | — | Free | Utilities |
| [Bridle Y](https://appshunter.io/ios/app/bridle-y/id6762308062) | — | Free | Utilities |

## More apps by Grima Hdez

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- [Drawing And Painting](https://appshunter.io/ios/app/drawing-and-painting/id1501400328)
- [Voice Recorder & To do list](https://appshunter.io/ios/app/voice-recorder-and-to-do-list/id1516155953)
- [Fit as - Register Your Steps](https://appshunter.io/ios/app/fit-as-register-your-steps/id1521810948)

All apps by Grima Hdez: https://appshunter.io/developer/1741481582

## Related topics

[rigging load calculator tool](https://appshunter.io/ios/topics/rigging-load-calculator-tool) · [crosby rigging](https://appshunter.io/ios/topics/crosby-rigging) · [rigging calculator](https://appshunter.io/ios/topics/rigging-calculator) · [rigging](https://appshunter.io/ios/topics/rigging)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-13.*