GCSE Computer Science

Step through Bubble, Insertion, and Merge sort, compare efficiency side-by-side in race mode, and practice pass-by-pass tracing.

• ✓ Step-by-step sorting animations with comparisons, swaps, and quick explanations
• ✓ Pass-by-pass trace tables you can follow and practice for exam questions
• ✓ Algorithm race mode comparing best, average, and worst-case time complexities

Master the guaranteed 4–6 mark Paper 1 exam question. Step through loops and conditions line-by-line while filling the trace grid.

• ✓ Step-by-step code execution pointer synchronized with live variable inspector
• ✓ Interactive exam trace table: fill cells and get instant mark-scheme feedback
• ✓ Classic AQA traps: off-by-one loop bounds, integer division, and boolean logic

Interactive 8-bit binary register, two's complement, binary arithmetic, bitwise logic (AND, OR, XOR), shifts, data units, and ASCII/Unicode text encoding.

• ✓ 8-bit interactive register, +/-1 steppers, and 3-way Denary/Hex/Binary live converter
• ✓ Addition with overflow alert, two's complement subtraction workbench, and bitwise logic masks
• ✓ Data units scale (kB vs KiB) and live secret message character encoder

Draw on a pixel grid to see bitmap binary, test sound sampling & quantization with a live musical Theremin, record your voice, and explore RLE compression.

• ✓ Interactive drawing grid & large photo quantization (1-bit up to 24-bit True Colour)
• ✓ Sound Theremin and 2.0s voice recorder demonstrating sampling rate and bit depth
• ✓ Image & audio file size calculations with dual prefix breakdown (kB vs KiB) and RLE run tracker

Step through the Von Neumann Fetch-Decode-Execute cycle, watch animated data-packets travel between registers, and benchmark CPU clock speed, cache, and cores.

• ✓ Animated register data-flow: PC, MAR, MDR, CIR, ACC, and ALU across Address & Data buses
• ✓ Step-by-step FDE stage tracer with plain-English AQA mark-scheme explanations
• ✓ CPU Performance Sandbox: Clock Speed (GHz), Cache size (L1/L2), and Multi-Core bottlenecks

Interactive SQL Studio with live clause tracer (FROM → WHERE → ORDER BY → SELECT), visual Primary/Foreign key schema, and exam practice challenges.

• ✓ Interactive SQL engine testing the 4 AQA commands: SELECT, FROM, WHERE, ORDER BY
• ✓ Linked two-table schema with Primary Key (PK) & Foreign Key (FK) relationship explorer
• ✓ Warm-up to exam-level challenges with instant automated mark schemes & model answers