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.

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

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.

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.

Practice calligraphy strokes with pressure-sensitive drawing, guide sheets, and reference letterforms.

Color and annotate the periodic table by property, group, or custom categories for study purposes.

Plot mathematical functions on a coordinate plane with zoom, multiple functions, and intersection finding.

Create customizable number lines with tick marks, labels, fractions, and highlighted intervals for math education.

Plot points, lines, and shapes on a coordinate plane with quadrant labeling and grid snapping.

Generate printable mazes of various sizes and difficulty levels using recursive backtracking algorithms.

Create custom crossword puzzles from word lists with automatic grid generation and clue numbering.

Create printable word search puzzles from custom word lists with configurable grid size and difficulty.

Generate printable bingo cards with custom words, numbers, or images with randomized placement.

Create, study, and print two-sided flashcards with spaced repetition and progress tracking.

Generate printable Sudoku puzzles at easy, medium, hard, and expert difficulty with solution keys.

Generate printable handwriting practice sheets with custom text, letter tracing, and guide lines.

Write basic music scores with notes, rests, time signatures, and playback using Web Audio API.

Create and print guitar chord diagrams with finger positions, barre chords, and custom tuning.

Convert images into color-by-number templates with numbered regions and color palette legend.

Create numbered dot-to-dot puzzles from images or custom drawings for children's activities.

Extract and display all footnotes and endnotes from academic PDF documents.

Build multiple-choice and true/false quizzes with scoring, timer, and review mode stored locally.

Track study sessions by subject with built-in Pomodoro cycles, daily goals, and weekly progress charts.

Type a word or phrase and hear it spoken aloud in multiple languages using the Speech Synthesis API.

Gamified typing practice with falling words, scoring, difficulty levels, and WPM tracking over time.

Classic memory card-flipping game with difficulty levels, move counter, timer, and best score tracking.

Calculate weighted and unweighted grades from assignments with what-if scoring and final grade prediction.

Generate formatted citations in APA, MLA, Chicago, and Harvard styles from book, website, or journal details.

Unscramble randomly shuffled words with hint system, difficulty levels, and score tracking.

Enter letters and find all valid English words that can be formed from them with length filtering.

Enter known letters and blanks to find matching words for crossword puzzles from a built-in dictionary.

Play reference tones for musical notes using Web Audio API with tuning standard adjustment (A4 = 440Hz).

Tune your guitar by matching microphone input to reference pitches using Web Audio frequency analysis.

Play a virtual piano in your browser using keyboard shortcuts or mouse clicks with Web Audio synthesis.

Create drum patterns on a step sequencer grid with multiple kits, tempo control, and loop playback.

Learn and practice Morse code with audio playback, speed control, and interactive exercises.

Competitive typing race against AI opponents with difficulty levels, leaderboard, and personal bests.

Flashcard-style quiz on chemical elements covering symbol, atomic number, and electron configuration.

Practice addition, subtraction, multiplication, and division with auto-generated flashcards and scoring.

Practice converting between Roman numerals and Arabic numbers with timed quiz mode and scoring.

Test your color perception by matching HEX values, finding complementary colors, and identifying hues.

Interactive demonstration of the Diffie-Hellman key exchange protocol with step-by-step visualization.

Compare AES encryption modes (ECB, CBC, CTR, GCM) visually with encrypted output and security analysis.

Encrypt and decrypt text using the Caesar cipher with shift selection and brute-force decryption display.

Encrypt and decrypt text using the Vigenere cipher with key visualization and frequency analysis tools.

Interactive OAuth 2.0 flow simulator for learning authorization code, implicit, and client credentials grants.

Interactive tool to experiment with different encryption algorithms (AES, DES, RC4, Blowfish) and compare their outputs.

Interactive JWT reference showing registered claims, common algorithms, and best practices with examples.

Educational tool demonstrating dictionary and brute-force hash cracking techniques against common hash types.

Generate cryptographically random one-time pads and encrypt/decrypt messages with perfect secrecy (educational).

Interactive playground for experimenting with the Web Crypto API - key generation, encryption, signing, and hashing.

Browse and search HTML character entities with name, number, and Unicode code point for special characters.

Search Unicode characters by name, code point, or block with copy-to-clipboard and encoding display.

Browse and search Schema.org types and properties with examples, required fields, and hierarchy navigation.