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Crux

Crux is a study app for KU engineering units. It takes the past papers and books for your units and turns them into practice questions. When you get one wrong, it helps you find the step where your working went off.

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Crux comes with Engineering Study Hub membership, including the 7-day free trial you get when you join.

Setting up Crux

You only do this once.

  1. 1

    Make a Discord account

    Skip this if you have one.

    Sign up on Discord
  2. 2

    Join the Hub's server

    Your 7-day free trial starts here.

    Join the server
  3. 3

    Come back here and sign in

    Press Authorize when Discord asks.

    Sign in with Discord
  4. 4

    Pick your course and units

    Crux asks for these the first time you open it. On a phone, it also offers to go on your home screen so it opens like an app.

Practice questions from your papers and books

  • Past papers and CATs, split into questions with each part on its own line.
  • The worked examples and exercises in your unit's books, word for word, with the book's own solution kept as the answer.
  • Open in book takes you to the page the question is on.
A practice question from Fundamentals of Strength of Materials, Example 1.1, with Open in book at page 22

Worked solutions

  • Type your final answer and Crux checks it. If it's wrong, you pick the step where your working went off, and that step is saved as a weak spot.
  • Ask for the full solution: what's given, the method, numbered steps with the maths typeset, and a check at the end.
  • Beams and bars come with a free body diagram drawn to scale.
A worked solution with a free body diagram of a simply supported beam: a 5 kN load and the two reactions

A study guide for each topic

  • What the course expects you to be able to do, the formulas, and the chapter, section and pages to read in your own books.
  • What you can skip, how the topic tends to be examined, and an order to study it in.
  • Each guide is made once and shared with your whole class.
The study guide for Stress and Strain: what you should be able to do, the formulas, and the sections to read in Gere

Notes and a focus timer

  • Select a formula or a step anywhere in Crux and pin it. It stays in the notes bar while you work, and you can copy it into any AI.
  • A focus timer you can run alone or in a unit room with others studying the same unit.
  • There are also timed papers, a Prompt Builder for ChatGPT or Claude, and your work syncs between your phone and laptop.
The focus timer with the notes bar beside it

What it costs

Crux is part of your Hub membership. There's nothing extra to pay for it.

Free trial

KES 0

7 days from when you join. 15 AI actions and 2 file downloads a day.

Basic

KES 50 a semester

15 AI actions and 2 file downloads a day.

Premium

KES 500 a semester

40 AI actions a day and unlimited downloads. If you're on Basic already, the upgrade is KES 350.