AP CSP Pseudocode Blocks Editor — Free, In-Browser
A free AP CSP block & pseudocode editor with robot-grid challenges that matches the exam reference sheet. Runs in your browser, no install, no login.
Common questions
Is the AP CSP pseudocode editor free?
Yes. The AP CSP Pseudocode IDE is completely free and always will be — no payment, no credit card, and no trial limit. CS++ also offers an optional $9.99 lifetime membership that unlocks the full AP CSP course, mock exams, and AI tools, but the pseudocode editor itself stays free.
Do I need to install anything or create an account?
No. The editor runs entirely in your web browser with no install and no login required. Just open csplusplus.com/blocks, drag blocks into the workspace, and click Run. Creating a free account is optional and only adds progress saving and access to the rest of the AP CSP course.
Does it work on Chromebooks and school devices?
Yes. Because everything runs in the browser, the AP CSP pseudocode editor works on Chromebooks, school-managed laptops, tablets, and any device with a modern browser — no admin rights or app store needed, which makes it well suited to school computer labs.
Does it match the official AP CSP exam reference sheet?
Yes. The blocks mirror the AP Computer Science Principles exam reference sheet pseudocode — variables and assignment, conditionals, REPEAT and REPEAT UNTIL loops, 1-indexed lists, and procedures — so what you build looks and behaves like the pseudocode you'll see on exam day.
Can I practice the AP CSP robot grid questions?
Yes. Toggle to Robot Blocks mode to control a robot on a grid using the AP CSP exam commands MOVE_FORWARD, ROTATE_LEFT, ROTATE_RIGHT, and CAN_MOVE. It mirrors the robot questions from the AP CSP exam so you can trace and test robot programs visually.
Is it good for beginners, and can teachers use it in class?
Yes to both. Drag-and-drop blocks mean beginners can build correct AP CSP pseudocode without memorizing syntax, and links to a guided pseudocode lesson and vocabulary make it easy to start. Teachers can use it for live demos, labs, and homework, and CS++ classroom licenses add assignments, lockdown quizzes, and per-student progress.