PseudoRun is a free, browser-based pseudocode interpreter built specifically for Cambridge IGCSE (and A-Level) pseudocode. It lets you write, run, and debug pseudocode instantly without downloads or sign-up.
What is PseudoRun?
PseudoRun is a web application that takes IGCSE-style pseudocode as input and produces live execution output in a built-in console. It runs entirely in the browser and was created as a free side project by an individual developer. No installation or account is required to get started. You can start using it at https://pseudorun.tech without signing up.
Key Features
- Syntax highlighting and error detection — The editor highlights IGCSE pseudocode keywords and catches syntax mistakes as you type, reducing guesswork.
- Line-by-line debugging — Step through code one line at a time, inspect variable values, and observe how loops and conditionals change state.
- Instant execution — Press run to see output immediately in the adjacent console panel, with no compilation delay.
- Cloud saves (optional) — Sign in with a free account to save your work and pick it up on any device.
- Built-in examples — The editor includes example programs (like the FOR loop demo on the homepage) to help you learn the syntax.
- 100% free — No ads, no paid tiers, no feature limits. The tool is funded by optional donations (buy me a coffee).
Who is it for?
- IGCSE Computer Science students — Practice writing and testing pseudocode for exam preparation without needing a full programming environment.
- Teachers — Demonstrate algorithm concepts live in class using a tool that follows the exact Cambridge specification.
- Self-taught learners — Experiment with control structures, arrays, and procedures in a safe sandbox before moving to languages like Python or Java.
