Build flowcharts, run your logic, and watch your ideas come to life.
No syntax. No installation. Just learn how programs think.
Build → Run → See
your logic come alive!
Flowchart
Run Result
Programming is really about breaking a problem into steps, making decisions and repeating things. B4Coder lets you learn exactly that, before a single line of code gets in the way.
A missing bracket or semicolon stops most beginners on day one. Here every step is a block in plain words, so you spend your time on the idea.
Press Step and watch the program think: the block that's running lights up, every value is on screen, and FlowBot says what's happening.
When the logic makes sense, one click shows the same program in Python, Java, C++, C# or JavaScript. Typing code comes next, not first.
It all happens in your browser, on any computer or Chromebook.
1 Build
Snap blocks together and join them with arrows: Ask, Decide, Tell, Repeat.
2 Run
Press Run, or Step one block at a time, and watch your program think out loud.
❓ What is your age? 17
🤖 I'm checking: age >= 18 → NO
💬 You are a minor
3 See the code
One click turns your flowchart into real code, in the language your class uses.
age = int(input("What is your age? ")) if age >= 18: print("You are an adult") else: print("You are a minor")
Your flowchart drives a cartoon: make Rahul walk to breakfast, teach Robo maths, run a hotel kitchen, feed the pets. Each mission says what to build and which blocks to use.
Story Mode · 🏠 Rahul's Morning
Your flowchart says
steps = 0
Repeat 5 times:
steps = steps + 1
holding = "banana"
Tell "Breakfast time!"
Run it, or press Step to go one block at a time. The running block glows, every value is on screen, and FlowBot explains each step in plain English. Mistakes stop being a mystery.
Steps
FlowBot says17 isn't 18 or more, so I'll follow the NO path.
age Number
17
Press View Code and your flowchart appears as a real program: the same steps in Python, Java, C++, C# or JavaScript, with the types worked out for you. It's the bridge from blocks to typing code.
n = int(input("Which times table? "))i = 1for _ in range(10): print(str(n) + " x " + str(i) + " = " + str(n * i)) i = i + 15 worlds of challenges, each adding a few new blocks on top of the last, with three hints for every challenge that nudge you without giving the answer away.
Never coded before? You won't be lost. Start here shows what to do next, and ticks off each step as you go.
Coming next: 📱 App Mode, turn your flowcharts into real apps for your phone.
Set up your institution in minutes and give every student their own login. Teachers can use B4Coder in class straight away, with nothing to install.
Runs in any up-to-date browser: lab computers, laptops and Chromebooks.
Paste your students' names and print their login cards. No email or phone needed.
A forgotten password is fixed in a click, right in class.
Pay only for students, for the year. Teachers and admins are free.
Yes, to start. Every block, the guide, the first missions of every story, the starter examples and the first challenges are free, with no account needed. Pro opens every story and every challenge. See pricing.
No. It runs in your web browser, on any computer or Chromebook. Sign in (it's free) when you want to save your programs.
Students from about age 10 up to college, and anyone starting to program. You don't need to know any code: plain words and big buttons all the way.
Yes. The blocks are the real ideas of programming: steps, values, decisions, loops, lists, functions and classes. And View Code shows every program in JavaScript, Python, Java, C++ and C#.
Yes. Set up your institution for free, give students logins without email, and pay a yearly licence per student; teachers are free. For educators.
“Everyone can learn to program. It just takes the right tools.” Your first program is about a minute away, and it's free.