Interactive tools
Reading about a truth table is not the same as building one. These tools let you do the thing itself, get it wrong, and see immediately why. Everything runs in your browser, nothing you type is sent anywhere, and none of it needs an account.
Number base converter
Convert between denary, binary and hexadecimal, with every step of the working written out.
File size calculator
Work out the size of an image, a sound file or a block of text, one conversion at a time.
Logic gate simulator
Build a circuit from gates, wire it up, and see the truth table fill in as you go.
Sorting algorithm visualiser
Run bubble, insertion, merge and quick sort side by side and count the comparisons.
Trace table trainer
Fill in a trace table row by row and have it marked as you type.
Little Man Computer
Assemble and run LMC programs and watch the fetch decode execute cycle happen.
Classifier scorer
Move the threshold and watch precision and recall trade against each other.
Correlation lab
Add and drag points on a scatter plot and watch the coefficient respond.
Games
Practice that does not feel like practice.