FOR i ← 1 TO n

DECLARE x : INTEGER

OUTPUT "Hello"

WHILE count < 10

IF score > 50

NEXT i

Cambridge IGCSE & A-Level Pseudocode Spec

Write pseudocode.
See it run.
Ace the exam.

The only IDE built specifically for Cambridge International pseudocode — with real-time execution, syntax highlighting, AI-powered feedback, and a built-in reference guide.

▶ Start writing — it's free Watch 2 min demo →

⚡ Editor

⊢_ Output

□ Reference

✦ AI Feedback

▶ Execute

// Cambridge IGCSE Grade CalculatorDECLARE score : INTEGERDECLARE grade : STRINGINPUT scoreIF score ≥ 90 THEN grade ← "A*"ELSE IF score ≥ 70 THEN grade ← "A"ELSE grade ← "B"ENDIFOUTPUT "Grade: ", grade

✦ AI Feedback7/10

⚠ Mark Scheme

Missing boundary case for scores between 0–69. Cambridge mark scheme awards 1 mark for handling this.

ELSE
grade ← "C"
// Add for full marks

✓ Correct

Proper use of DECLARE before INPUT. Good indentation structure.

// features

Everything you need
to master the spec

Built by a Cambridge CS teacher from the ground up. Every feature solves a real problem students face when learning to write pseudocode under exam conditions.

⚡

Live Execution

Run your pseudocode in real time and see exactly what the interpreter does. No more guessing if your logic is right.

✦

Syntax Highlighting

Keywords, operators, strings, and types each get their own colour. Instantly spot structure and avoid formatting mistakes.

□

Built-in Reference

Every Cambridge construct documented with examples, right inside the editor. No tab switching, no Googling mid-question.

↵

Smart Indentation

Auto-indents after IF, FOR, WHILE, and PROCEDURE blocks. ENDIF and NEXT auto-outdent. Your pseudocode stays readable.

←

Arrow Conversion

Type <- and it becomes the proper assignment arrow ←. Write exactly as the spec requires.

↗

Export Ready

Download your pseudocode as a clean text file, formatted and ready for your teacher, coursework folder, or revision notes.

// how it works

From blank editor
to exam confidence
in three steps

Write your pseudocode

Start typing in the Editor tab. Syntax highlighting kicks in immediately, helping you structure your logic correctly from line one.

DECLARE · FOR · IF · WHILE · OUTPUT

Hit Execute and see the output

Click Execute and the interpreter runs your pseudocode. The Output tab shows exactly what your algorithm produces, instantly.

12ms avg. execution

Check the Reference when stuck

Forget the syntax for a CASE statement? Switch to the Reference tab. Every Cambridge construct with examples, right next to your code.

Full Cambridge IGCSE & A-Level spec

□Reference

Variables

DECLARE name : TYPE

Assignment

variable ← value

Output

OUTPUT message

Loops

FOR i ← start TO end
...
NEXT i

Conditionals

IF condition THEN
...
ELSE
...
ENDIF

// cambridge spec

Every construct.
Zero compromises.

Built to the exact Cambridge International pseudocode specification for IGCSE (0478) and A-Level (9618) Computer Science. If it's in the spec, it works here.

DECLAREFOR...NEXTWHILE...DOREPEAT...UNTILCASE OFIF...ENDIFPROCEDUREFUNCTIONARRAYOUTPUTINPUTRETURNBYVAL / BYREFMOD / DIVOPENFILEREADFILE

⊢_ Output

DECLARE total : INTEGERtotal ← 0 FOR i ← 1 TO 5 total ← total + iNEXT i OUTPUT total→ Running...15 ✓ Executed in 8ms

Other tools

✕Cambridge-specific

✕← arrow symbol

✕Built-in reference

✕AI mark scheme

PseudoLab

✓Cambridge-specific

✓← arrow symbol

✓Built-in reference

✓AI mark scheme

Your personal
exam board tutor,
inside the editor.

PseudoLab's AI doesn't just check your syntax — it evaluates your pseudocode against real Cambridge mark schemes, flags missing marks, and suggests improvements the way an experienced examiner would.

Cambridge 0478Cambridge 9618OCR J277AQA 8525

Mark Scheme Evaluation

Submit your pseudocode and the AI evaluates it against the Cambridge mark scheme for that question type — identifying exactly which marks you'd earn and which you'd drop. Like having an examiner mark your work in seconds.

Inline Suggestions

Contextual improvement hints appear directly alongside your code as you write — not a wall of text at the end, but precise, line-level guidance.

/ 10 marks

100%

Cambridge aligned

This platform transformed how we handle pseudocode teaching. The AI mark scheme features alone saved us countless hours of manual marking every week.
CSRo'mie - Software EngineerIGCSE & A-Level

Question Context Mode

Paste in the actual exam question. The AI understands the context and evaluates your pseudocode specifically against what that question demands — not generic rules.

Efficiency & Exam-Style Rewrites

Flags O(n²) loops where O(n) is possible. Ask the AI to rewrite your solution in the exact style Cambridge examiners expect. See a before/after diff view.

Write pseudocode.
See it run.
Ace the exam.

Everything you need
to master the spec

From blank editor
to exam confidence
in three steps

Every construct.
Zero compromises.