SIMPL Pseudocode
Run Cambridge pseudocode as it is written: a free interpreter and IDE for learning to program.
Run Cambridge pseudocode as it is written: a free interpreter and IDE for learning to program.
This page is designed to help you find out whether SIMPL Pseudocode is good and if it is the right choice for you.
SIMPL is a free interpreted language and IDE that runs pseudocode exactly as it is written. It follows the official Cambridge AS & A Level Computer Science (9618) pseudocode guide, so students can type an exam-style algorithm, press Run and see the result, or an error message in plain words pointing to the line to fix.
Built for learning - Errors caught while you type, with "Did you mean...?" hints for misspelt keywords and names - Debugger with Step Over, Step Into and Step Out, highlighting the variables that change at each step - Automatic trace table, filled in as the program runs, just like a dry run on paper - Complete manual with exercises and worked solutions, opened next to the code; every error links to its explanation - Cambridge strict mode, listing anything that goes beyond the official guide
Beyond the exam Graphics, sound and keyboard input are built in, so the same readable syntax goes from a first loop to a small game.
Details - Free (name your own price), no features locked - Windows 10/11 and Linux, single portable file, no installation - Works fully offline, no account, no data collected
Listed in
Cambridge pseudocode
Runs the official AS & A Level 9618 pseudocode as written
Live syntax check
Errors underlined while you type, with “Did you mean...?” hints
Debugger
Breakpoints, Step Over, Step Into, Step Out, changed variables highlighted
Trace table
Filled in automatically as the program runs; export to CSV or print
Built-in manual
Full manual with exercises and solutions; every error links to its explanation
Strict mode
Lists anything that goes beyond the Cambridge guide, with its section
Graphics and sound
Canvas drawing, keyboard input and sound for games
Offline
No installation, no account, no data collected
It runs the official Cambridge 9618 pseudocode exactly as students write it in the exam, and wraps it in an IDE built for learning: errors explained in plain words, a debugger, and a trace table filled in automatically.
Most pseudocode tools accept their own dialect. SIMPL follows the Cambridge guide closely, and its strict mode tells you exactly what goes beyond it. It also works offline, needs no installation or account, and comes with a complete manual with exercises and solutions.
Students preparing for Cambridge Computer Science exams and their teachers, and more generally anyone learning to program who wants a readable language without the noise of a professional one.
Students often wrote algorithms on paper with no way to check them. I wanted a tool where pseudocode is simply typed and run, as in the home computers of the 80s, and grew it into a complete language and IDE.
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