Foundation
Class 1 to 2
Picture-led computing: screens, sorting, pixels, and kind habits.
Public beta · Class 1 to 12
Learn by Doing. Grow Every Day.
Fun, interactive lessons for students from Class 1 to Class 12. Build plans, run experiments, and watch every idea come alive with clear, step-by-step explanations.
Choose Your Class
Find lessons designed for your age and learning level.
Building Skills
Class 3 to 5
No typing yet. Robot plans, patterns, maps, and screen habits.
Middle School
Class 6 to 8
Explore deeper concepts and real-world applications.
High School
Class 9 to 10
Prepare for advanced concepts and future success.
Senior School
Class 11 to 12
Master board-level topics with clear step-by-step labs.
Safe. Structured. Smart Learning for Every Student.
Don't Just Learn. Try It Yourself.
Build a list of moves and step through the robot grid. No account, no signup.
Robot planner
Sequences, turns, repeats and choices→
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The plan
- Forward
- Forward
- Forward
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Start
The robot starts here, facing right. The plan has 3 steps. It will follow them exactly, even when that is wrong.
Pick a Learning Path
Choose a path and follow the lessons in order. Each one ends with a project, a quiz, and your CodexLab certificate.
Class 1 to 2See how computers work before you read about them.
Picture-led computing for ages 5 to 7: input and output, sorting data, pixels and patterns, and safe habits online. Every activity links to how a real computer works.
Start with Computer Input and Output, then Sort Pattern and Pixels, then Safe Computing.
Start here!6 lessons
Computer Input and Output
How you send commands in, and the computer shows answers out.
Up next6 lessons
Sort, Pattern and Pixels
Classify, sort, repeat and paint like a computer.
Step 36 lessons
Safe Computing
Kind, careful habits for young computer users.
Class 3 to 5No typing. Just clear thinking.
A computer is a machine that follows instructions exactly. Start with robot plans and patterns, then try maps, daily routines and kind screen habits. No typing needed.
Start with Computers Without Code, then try Patterns and Predictions.
Start here!8 lessons
Computers Without Code
Give the robot a plan and watch it run.
Up next9 lessons
Patterns and Predictions
Spot the repeat, guess what comes next.
Step 39 lessons
Maps, Grids and Directions
Read the map, plan the route, reach the treasure.
Step 49 lessons
Everyday Algorithms
Recipes, routines and rules you already follow.
Step 59 lessons
Safe and Smart with Screens
Kind, careful and rested online.
Class 6 to 8Find out what the machine is actually doing.
Open the box: bits and logic inside the machine, then follow a search across the internet and learn passwords, phishing checks and kind behaviour online.
Start with How a Computer Thinks, then How the Internet Works, then Staying Safe Online.
Start here!6 lessons
How a Computer Thinks
Start with a switch. Finish with a working processor.
Up next6 lessons
How the Internet Works
Follow a search from your screen to a server and back.
Step 36 lessons
Staying Safe Online
Passwords, tricks, permissions and kindness.
Class 9 to 10Method, data and the systems you use daily.
Split problems apart, see how pictures and sound become numbers, and learn what AI chatbots really do, with honest limits and school-friendly examples.
Start with Think Like a Programmer, then Pictures, Sound and Files, then How AI Guesses.
Start here!6 lessons
Think Like a Programmer
Split problems, trace code, backtrack, then type.
Up next6 lessons
Pictures, Sound and Files
RGB grids, wave samples and smaller files.
Step 36 lessons
How AI Guesses the Next Word
Tokens, patterns, training and honest limits.
Class 11 to 12Watch every structure move, step by step.
Data structures, algorithms and the cost of a decision measured rather than asserted. The summit of the ladder, still taught with animations you control.
15 Subjects for Every Stage
The ladder starts with no typing at all and ends with data structures and algorithms.
Class 1 to 2
Computer Input and Output
The first computing ideas: screens as output, taps and clicks as input, power states, picture plus sound together, and asking for help when something on screen looks wrong.
6 topics available
Class 1 to 2
Sort, Pattern and Pixels
Classification, colour sorting, size compare on screen, icon shapes, repeating patterns that lead to loops, and painting with pixels like a real digital image.
6 topics available
Class 1 to 2
Safe Computing
Digital citizenship for class 1 to 2: trusted adult nearby, caring for hardware, kind online choices, privacy and passwords, fair sharing of devices, and family screen rules.
6 topics available
Class 3 to 5
Computers Without Code
The first ideas in computing, with nothing to type. Put steps in the right order, repeat them, choose between them, and watch a robot do exactly what you said rather than what you meant.
8 topics available
Class 3 to 5
Patterns and Predictions
Unplugged pattern thinking before formal loops. Clap, colour, grow and build AB and ABC patterns, then tell pattern from random.
9 topics available
Class 3 to 5
Maps, Grids and Directions
Spatial thinking with directions, map symbols, grid robots and landmark routes. Extends the robot ideas with real navigation skills.
9 topics available
Class 3 to 5
Everyday Algorithms
Daily tasks as algorithms: recipes, morning routines, packing, drawing, cleaning, fair sharing, game rules and weekly planning.
9 topics available
Class 3 to 5
Safe and Smart with Screens
Light digital citizenship for ages 8 to 10: screen balance, safe clicking, kind words, privacy basics and asking adults for help.
9 topics available
Class 6 to 8
How a Computer Thinks
What is actually happening under the screen: bits, logic gates wired into an adder, and the fetch-decode-execute loop your processor repeats billions of times a second. Labs let you flip switches and step through each stage.
6 topics available
Class 6 to 8
How the Internet Works
Names turned into numbers, packets hopping across the world, and why the padlock in the browser bar matters. Written for class 6 to 8, with labs you can step through.
6 topics available
Class 6 to 8
Staying Safe Online
Passwords, phishing, app permissions and being kind online. Defence and good habits only, taught the way a school pastoral team would want it said.
6 topics available
Class 9 to 10
Think Like a Programmer
Split homework-sized tasks into steps, trace variables on paper, backtrack through mazes, and plan before you type. Thinking skills for any language you learn in senior classes.
6 topics available
Class 9 to 10
Pictures, Sound and Files
How photos become RGB grids, how sound becomes samples, and why files shrink without disappearing. Science fair level, with pixel and wave labs you can play with.
6 topics available
Class 9 to 10
How AI Guesses the Next Word
A plain mental model of the chatbots students already use: tokens, next-word guessing, training from examples, and why confident wrong answers happen. School honesty rules included.
6 topics available
Class 11 to 12
Data Structures & Algorithms
Board exam structures taught as animations you control: step through arrays, trees, sorts and searches, then see why Big-O matters on large inputs.
13 topics available
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Certificates
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Badges
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Learning Streaks
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Completed Challenges
Take on quizzes and projects to prove what you know.
Learning Designed for Growing Minds
CodexLab is built for students and trusted by parents. Clear progress, safe content, and real skills.
- Age-appropriate lessons for Class 1 to Class 12
- No account required: progress is saved on this device
- Optional name on certificates stays in the browser
- Certificates awarded for completed learning paths
- Skill-based learning with hands-on labs and quizzes