Free online learning tools

Japanese-language tool that picks a year and class, then places students in a seating grid at random.

Adjust the parameters of a Cobb-Douglas production function and compare output across settings with a short economics note.

Japanese-language step-through of the edit distance (Levenshtein) table for two strings.

Fits a line to housing data by square footage, bedrooms or age, shows slope, intercept and R-squared, and predicts a price.

Supply and demand curves that shift when you raise or lower either one, so you can see the equilibrium move.

Add labeled points on a study-habits chart, set k, and see how a new point is classified by its nearest neighbors.

Shows next-token probabilities for input text and how probability threshold and token limit change generated output.

Editable training set of spam and normal messages; type a new message and see how Naive Bayes classifies it.

Steps through the sliding-window method for the longest substring without repeats, showing the character map and current window.

Plots pass/fail students by study versus social media hours and compares linear and non-linear SVM boundaries.

Walks through self-attention one step at a time: tokens, embeddings, queries, keys, values and output states.

Simulates a small CPU cache: enter hex addresses and data, then watch index, state, data and LRU timestamps update.

Interactive flashcards for practicing Chinese.

Builds a short quiz from an article or video link to help you check what you took in.

A game where you estimate the correlation of randomly generated scatter points.

Flip-card deck for learning German vocabulary with English translations, with shuffle, reset and previous/next controls.

Three-screen lesson: a puzzle, an explorer where you change the step size, and a naming screen that explains the update rule.

Tap-to-reveal flashcards for the Gurmukhi script, with arrow navigation between cards.

Compress text with Huffman coding and decompress it again to see how the code table works.

Animated solar system in Portuguese with toggles for orbits and labels and a simulation speed control.

Flashcard deck for practicing Kannada.

Shows how layer normalization reshapes uniform, normal and exponential data, with a regenerate button.

Paste submission data copied from a Word file and get a list of students with missing assignments.

A small pricing game, inspired by the Keynesian beauty contest, for experiencing how equilibrium emerges.