Free tools to help you learn concepts and save time.
Draw class diagrams and export as PNG.
Wire gates, see live truth tables.
Convert between Binary, Decimal, Octal and Hex.
Run SQL queries on a real database in your browser.
Write and run Python code right in your browser.
Paste JSON and explore it as an interactive node graph.
Watch how array, stack, queue, tree, and graph operations work step by step.