Education & Reference

Interactive periodic table - click elements, enter quiz mode, and guess elements from their properties. Gamified learning.

Explore the periodic table with element details, properties, and category filtering.

Browse and search ASCII, Unicode, and binary character codes with copy-to-clipboard.

Practice identifying WCAG-compliant color contrast ratios with interactive exercises.

Test your knowledge of semantic HTML elements with quizzes and best-practice tips.

Check text readability and accessibility compliance with WCAG guidelines and scoring.

Structured typing lessons with finger placement guide. Track WPM improvement over time with localStorage persistence.

Timed multiplication drills with accuracy tracking per table (1-12). Progress chart saved across sessions.

Identify countries and capitals on a continent-organized world grid. Filter by region, track scores, and learn capitals.

Upload diagrams and add labeled callouts, arrows, and annotations interactively.

Resize and format images to standard presentation slide dimensions (16:9, 4:3).

Interactive unit circle: drag the angle and see sin, cos, tan values update live. Visual trigonometry learning.