Comparison

William Hackett App vs Sling Load Calc

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

William Hackett App

Read full description

The William Hackett App Totally re-written to provide an essential suite of tools to those working in the lifting and hoisting fields. RFID Scanning. Scan William Hackett products in the field using your mobile phone to access data on that individual item such as its Declaration of Conformity Certificate containing it’s serial number, item code, working load limit and date of manufacture. In addition to essential information such as safe use instructions available at the press of a button, wherever you are. Sling Calc. William Hackett Sling Calc is part of the new William Hackett app that lets you configure your chain sling by taking you through a number of steps. Once completed, the sling specification can be viewed along with a 3D image of exactly how the sling will look. A part code for the sling is generated and by hitting ‘request quote’ you can have a quote emailed to yourself instantly. This key feature is great for when working on site. Once you have the app downloaded, please fill out your details in the account settings and create an account for free. This account will also provide you access to members content on the William Hackett website (https://www.williamhackett.co.uk) such as CAD file downloads. Updated version: Revised design and performance fixes. Now supports both Imperial and Metric measurements, offers pricing in GBP, USD and Euros. Find these options in your Account Settings. The Sling Calc will take you through the following steps: - Product selection – Choose between grade 8, grade 10 or auto. If auto is selected, the app will work out the cheapest option for you based on the sling specification. - How many legs – Select how many legs you require on your sling. - Weight of load – Input the weight of the load to be lifted by the sling. - Headroom – Select whether headroom is restricted or not. If yes is selected, then sling rating will be 45°-60°. If no is selected, the sling will be rated from 0°-45°. - Leg length – Do you know the nominal leg length? If yes, simply input the length. If no, use the diagram to help you and input the distance between the lifting points. The sling calculator will then work out the required leg length. (note – all sling configurations are to the full meter, therefore slings may be rounded up). - Terminations – Select shortening device (if any) and lower termination. You will then be given a summary page, where it will list your requirements. This is what you have entered into the calculator. It will also give you a sling specification, this is the sling that the calculator has generated for you based on your requirements. A part code, sling description, RRP and 3D image is also visible on this page. Request quote will email your sling specification and quote to the email address entered in account settings. You can view old quotes by selecting ‘retrieve existing quote’ from the dashboard. You can also change your account settings from here.

About

Sling Load Calc

This app provides precise calculations for sling tension, length, and angle, essential for safe and efficient lifting operations. It's designed for professionals in heavy lifting industries, offering detailed reports and supporting various rigging configurations.

Highlights
  • Accurate sling tension calculations
  • Support for vertical and multi-sling loads
  • Easy-to-use interface
  • Detailed load and tension reports
  • Choice of measurement systems
  • Ensures safety standard compliance
Features
Read full description

Find accurate sling tension, length, and angle calculations anytime, anywhere with the Rigging Calculator Tool app. Need a reliable and precise tool for lifting and rigging calculations? The Rigging Calculator Tool app empowers engineers, project managers, heavy equipment operators, riggers and crane operators, students learning about rigging and lifting operations, and construction professionals with accurate sling tension analysis and load management. Ensure safe, efficient lifting operations and optimize every project with this must-have tool! ### Why Choose the Rigging Calculator Tool App? - Accurate Sling Tension Calculations – Calculate sling angles, sling loads, and tension values for various rigging configurations. - Easy-to-Use Interface – Intuitive design for quick and hassle-free operations. - Comprehensive Results – Get detailed load and sling tension reports to ensure safe lifts. - Industry-Specific Tool – Ideal for engineers, riggers, and construction professionals working in heavy lifting industries. ### Key Features: - Quickly and accurately calculate sling tensions for balanced lifting operations. - Support for both vertical and multi-sling load distributions. - Ensure compliance with safety standards during rigging and lifting tasks. - Generate detailed reports for project documentation. - Choose your preferred measurement system. Accurate sling load calculations are critical for safe and efficient lifting operations. ### How to Use: 1. Enter load weight and sling lengths. 2. Input sling angles and connection points. 3. View detailed tension calculations for each sling bridle. 4. Finally, get the results you want. The Rigging Calculator Tool app eliminates manual guesswork, minimizes errors, and ensures every lift is performed with confidence and precision. Optimize your lifting operations, minimize risk, and ensure compliance with safety standards. Join numerous professionals already benefiting from the Rigging Calculator Tool app. Don't miss out! Download the Rigging Calculator Tool today and elevate your rigging expertise! Privacy : https://topsuperapps.com/privacy.html Terms : https://topsuperapps.com/terms.html

Screenshots

William Hackett App4 screens
Sling Load Calc4 screens

Verdict

The call

The clearest difference is in-app purchases: William Hackett App at none against Sling Load Calc's 4. William Hackett App also leads on iOS requirement (12.2 vs 15.0). Sling Load Calc's advantage is update cadence (every 2 weeks vs every 4 months). On price, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Sling Load Calc sells 4 in-app purchases, starting at $1.99 per month. William Hackett App asks for nothing beyond the download.

UpkeepUpdate frequency

William Hackett App ships an update every 4 months, Sling Load Calc every 2 weeks. The most recent releases landed on September 10, 2026 and August 31, 2026 respectively.

Scorecard3 real differences · 6 level
William Hackett App versus Sling Load Calc: the parameters behind the verdict, then further details
ParameterWilliam Hackett AppSling Load Calc
PriceFreeFree
Rating—5.0 (4 ratings) — better
Number of ratings—4 — better
Update frequencyEvery 4 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.2 — better15.0
Further details — not scored
Size124 MB111 MB
Age rating4+4+
DeveloperLazy Grace LimitedPrakash Solanki

In-app purchases

None

William Hackett App

No in-app purchases

4 purchases

Sling Load Calc

Subscriptions4
  • 1 month plan$1.991 Month
  • Special 1 Year Plan$9.991 Year
  • Rigging Cal Pro3 Days trial$14.991 Year
Show 1 more
  • Yearly Pro Plan$14.991 Year

Questions

Is William Hackett App free?
William Hackett App is free to download, with no in-app purchases.
Is Sling Load Calc free?
Sling Load Calc is free to download, with in-app purchases available.
Do William Hackett App or Sling Load Calc have ads?
Neither William Hackett App nor Sling Load Calc shows ads.
Which is updated more often, William Hackett App or Sling Load Calc?
William Hackett App ships an update every 4 months, and Sling Load Calc every 2 weeks. Most recently, William Hackett App was updated on September 10, 2026 and Sling Load Calc on August 31, 2026.

Other comparisons