Education & Reference

Citation generators, periodic table, flashcard makers, and study tools.

Magic Square Generator Every row, column and diagonal, one sum. Waiting Line Simulator A little busier, a lot more waiting. Karnaugh Map Solver Group the ones. Keep only what you need. Crystal Lattice Explorer Fourteen ways to stack a world. Ising Model Simulator Tiny magnets, one dial, a phase transition. Percolation Simulator A little more open, and suddenly a way through. Flag Semaphore Trainer Two flags, eight directions, the whole alphabet. Traffic Jam Simulator No crash, no roadworks, and still everyone stops. Epidemic Curve Simulator Three boxes of people, one curve that rises and falls. Napier's Bones Calculator Multiplication tables on sticks, read along the slant. Tower of Hanoi Solver Move the tower, never big on small. Knight's Tour and N-Queens Lab One knight, every square. Eight queens, no quarrels. Sliding Puzzle Maker One empty square, and the picture comes back. Word Search Generator Your words, hidden in every direction. Sudoku Puzzle Generator Nine digits, one answer, and a reason for every step. Morse Code Practice Trainer Dits and dahs, learned by ear at real speed. Picture Logic Puzzle Maker Numbers on the edge, a picture hiding inside. Tangram Puzzle Maker Seven pieces, one square, endless shapes. Vernier Caliper Reading Trainer Find the line that lines up, and the reading follows. Soroban Abacus Trainer One bead for five, four for ones, and sums done by touch. Slide Rule Simulator Multiplying by sliding two rulers, the way it was done. Pentomino Puzzle Solver Twelve pieces, one board, every way they fit. Binary Search Tree Visualizer Every rotation, one step at a time. pH Calculator From concentration to pH, with the working shown. Maze Generator Carve it, solve it, print it, walk it. Pendulum Lab From a steady tick to chaos, one extra joint away. Character Inspector and Code Table Every character in your text, down to its bits. One-Time Pad Generator The one cipher proven unbreakable, on paper. Slide Image Sizer Every image fills the slide, none of them stretched. Periodic Table Quiz Interactive periodic table - click elements, enter quiz mode, and guess elements from their properties. Gamified learning. Periodic Table Interactive Reference Explore the periodic table with element details, properties, and category filtering. HTML Semantic Structure Quiz Test your knowledge of semantic HTML elements with quizzes and best-practice tips. Typing Tutor Structured typing lessons with finger placement guide. Track WPM improvement over time with localStorage persistence. Multiplication Table Drill Timed multiplication drills with accuracy tracking per table (1-12). Progress chart saved across sessions. Geography Quiz Map Identify countries and capitals on a continent-organized world grid. Filter by region, track scores, and learn capitals. Unit Circle Explorer Interactive unit circle: drag the angle and see sin, cos, tan values update live. Visual trigonometry learning. Calligraphy Practice Tool Practice calligraphy strokes with pressure-sensitive drawing, guide sheets, and reference letterforms. Periodic Table Coloring Tool Color and annotate the periodic table by property, group, or custom categories for study purposes. Math Function Graph Plotter Plot mathematical functions on a coordinate plane with zoom, multiple functions, and intersection finding. Number Line Generator Create customizable number lines with tick marks, labels, fractions, and highlighted intervals for math education. Coordinate Plane Tool Plot points, lines, and shapes on a coordinate plane with quadrant labeling and grid snapping. Crossword Puzzle Maker Create custom crossword puzzles from word lists with automatic grid generation and clue numbering. Bingo Card Maker Generate printable bingo cards with custom words, numbers, or images with randomized placement. Flashcard Maker Create, study, and print two-sided flashcards with spaced repetition and progress tracking. Handwriting Worksheet Maker Generate printable handwriting practice sheets with custom text, letter tracing, and guide lines. Simple Music Notation Editor Write basic music scores with notes, rests, time signatures, and playback using Web Audio API. Guitar Chord Diagram Generator Create and print guitar chord diagrams with finger positions, barre chords, and custom tuning. Color By Number Generator Convert images into color-by-number templates with numbered regions and color palette legend. Connect the Dots Maker Create numbered dot-to-dot puzzles from images or custom drawings for children's activities. PDF Footnote Viewer Extract and display all footnotes and endnotes from academic PDF documents. Quiz Maker Build multiple-choice and true/false quizzes with scoring, timer, and review mode stored locally. Study Timer / Study Planner Track study sessions by subject with built-in Pomodoro cycles, daily goals, and weekly progress charts. Pronunciation Checker Type a word or phrase and hear it spoken aloud in multiple languages using the Speech Synthesis API. Typing Practice Game Gamified typing practice with falling words, scoring, difficulty levels, and WPM tracking over time. Memory Card Matching Game Classic memory card-flipping game with difficulty levels, move counter, timer, and best score tracking. Grade Calculator Calculate weighted and unweighted grades from assignments with what-if scoring and final grade prediction. Citation Generator Generate formatted citations in APA, MLA, Chicago, and Harvard styles from book, website, or journal details. Word Scramble Game Unscramble randomly shuffled words with hint system, difficulty levels, and score tracking. Anagram Solver Enter letters and find all valid English words that can be formed from them with length filtering. Crossword Puzzle Helper Enter known letters and blanks to find matching words for crossword puzzles from a built-in dictionary. Online Guitar Tuner Tune your guitar by matching microphone input to reference pitches using Web Audio frequency analysis. Drum Machine / Beat Maker Create drum patterns on a step sequencer grid with multiple kits, tempo control, and loop playback. Typing Speed Race Competitive typing race against AI opponents with difficulty levels, leaderboard, and personal bests. Element Flashcard Quiz Flashcard-style quiz on chemical elements covering symbol, atomic number, and electron configuration. Math Flashcards Practice addition, subtraction, multiplication, and division with auto-generated flashcards and scoring. Roman Numeral Quiz Practice converting between Roman numerals and Arabic numbers with timed quiz mode and scoring. Color Matching Game Test your color perception by matching HEX values, finding complementary colors, and identifying hues. Diffie-Hellman Key Exchange Demo Interactive demonstration of the Diffie-Hellman key exchange protocol with step-by-step visualization. AES Modes Comparison Compare AES encryption modes (ECB, CBC, CTR, GCM) visually with encrypted output and security analysis. Caesar Cipher Tool Encrypt and decrypt text using the Caesar cipher with shift selection and brute-force decryption display. Vigenere Cipher Tool Encrypt and decrypt text using the Vigenere cipher with key visualization and frequency analysis tools. OAuth 2.0 Playground Interactive OAuth 2.0 flow simulator for learning authorization code, implicit, and client credentials grants. Encryption Playground Interactive tool to experiment with different encryption algorithms (AES, DES, RC4, Blowfish) and compare their outputs. JWT Cheat Sheet Interactive JWT reference showing registered claims, common algorithms, and best practices with examples. Hash Cracker Simulator Educational tool demonstrating dictionary and brute-force hash cracking techniques against common hash types. WebCrypto API Playground Interactive playground for experimenting with the Web Crypto API - key generation, encryption, signing, and hashing. HTML Character Reference Browse and search HTML character entities with name, number, and Unicode code point for special characters. Unicode Character Lookup Search Unicode characters by name, code point, or block with copy-to-clipboard and encoding display. Schema.org Type Reference Browse and search Schema.org types and properties with examples, required fields, and hierarchy navigation.