STEM and STEAM with real circuits, free in your browser
Projects, lesson plans and whole units in electronics and code, for families at home and for classrooms. Every one is a real circuit that runs in a browser tab, on a Chromebook as well as a laptop, with nothing to buy and nothing to install.
For parents and homeschoolers
Things to do at home, by age, with nothing to buy.
STEM activities at home
Light an LED, build a reaction game, make a night light that knows when it is dark. Every activity below is a real circuit that runs in your browser, so a curious kid can start in a minute and nothing breaks if they get it wrong.
Coding for kids
Many kids learn to code on a screen that only ever shows more screen. Here the code switches on a light, plays a note or reads a button, which makes every line mean something you can see.
Electronics for kids, by age
Where to start depends less on age than on whether your child can read a short paragraph and type. These bands are a starting point: move up as soon as something feels easy.
A homeschool electronics unit
You do not need to know electronics to teach this. The lessons check each step against the running circuit and tell your student what is still wrong, so you can learn alongside them.
For teachers and schools
Lesson plans, units by grade band, standards and the practical side of running it.
Free STEM lesson plans
Every plan here points at a circuit your class opens in one click, on the devices they already have. Take one lesson for tomorrow, or a whole unit for the term.
Arduino curriculum by grade band
The same simulator carries a sixth grader through their first LED and a senior through an ESP32 that serves a web page. What changes is how much the student writes themselves.
NGSS and CSTA-aligned units
Each curriculum pack lists the standards it supports, week by week. We cite a code only where we checked it against the published standard, and we say when a fit is partial.
Chromebook-ready STEM
A Chromebook cannot install desktop programs like the Arduino IDE, and most school devices are managed so students cannot install anything at all. Mokxi needs neither: it is a web page.
A makerspace on a budget
Parts get lost, LEDs burn out and kits are never quite complete by spring. Simulating first means every student gets a full bench, and the hardware you do buy goes further.
A substitute-ready STEM day
Leave one link and one instruction. The lesson explains each step, checks it against the running circuit and tells the student what is still wrong, so the substitute only needs to keep the room on task.
STEAM
Light, color and music, made with electronics and code.
STEAM: art and music with electronics
Electronics is a medium as well as a science. These projects start from color, light and sound, and the engineering comes along because the art needs it.
More for teachers and classes
Curriculum packs and the 12-week course
Ready-to-teach units with lesson plans, graded checkpoints, vocabulary and standards.
Coming from Tinkercad Circuits?
What carries over, the classroom starters already built, and how to bring a project across.
Free teacher resources
Every printable lesson plan, a start-tomorrow guide and the Chromebook notes.
Building escape room props?
Keypad, RFID, knock and solenoid locks, designed and tested before the prop is built.
Kids’ privacy, plainly
What happens to a child’s information, written from what the code does.
- Every project here opens and runs with no account, so a child never has to give a name or an email to use it.
- Saving work needs an account. A child under 13 can have one only with consent: a parent writes to us from their own email address and we confirm it, or a school gives consent for its classes.
- For a student in a class, no analytics or advertising tag loads on any page, and classmates never see each other’s email addresses.
The details, for parents and schools: Student data privacy, COPPA and FERPA
Start with one circuit
Open a project, press Run, change one thing. It takes about a minute, and no account.
Free forever. Every board and part. Saves your projects. Works on Chromebooks.