Lab

Tools & Experiments

124 interactive browser-based tools. Everything runs client-side — no server required.

124 tools · 10 categories · 100% client-side
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Neural Network Playground

Build and train small neural networks on toy 2D datasets. Watch decision boundaries evolve in real-time.

Explore

Fourier Transform

Draw a signal and see its frequency decomposition. Watch epicycles reconstruct waveforms one harmonic at a time.

Explore

Sorting Visualizer

Watch sorting algorithms race with animated bar charts. Compare Bubble, Quick, Merge, Heap, and more side by side.

Explore

Pathfinding Visualizer

Watch BFS, DFS, Dijkstra, and A* explore grids step by step. Draw walls, generate mazes, compare algorithms.

Explore

Fluid Simulation

Interactive 2D fluid dynamics using Stable Fluids. Inject dye, create turbulence, and place obstacles. Real-time Navier-Stokes simulation.

Explore

Fractal Explorer

GPU-accelerated Mandelbrot and Julia set explorer with infinite zoom, multiple color palettes, and WebGL shaders.

Explore
124 tools

Machine Learning & AI

Neural networks, optimization, embeddings, and generative models

23
New beta

Gradient Descent Animator

Visualize optimization algorithms racing across 2D loss landscapes. Compare SGD, Adam, AdaGrad, RMSProp, and Momentum in real-time.

optimization machine-learning gradient-descent visualization
New alpha

Tokenizer Playground

Visualize how LLM tokenizers break text into tokens. See BPE merges step-by-step and compare token counts across models.

nlp tokenizer bpe llm
New alpha

Neural Network Playground

Build and train small neural networks on toy 2D datasets. Watch decision boundaries evolve in real-time.

neural-network deep-learning machine-learning visualization
New beta

Convolution Visualizer

Watch convolution kernels slide across images step by step. Understand stride, padding, and feature map formation.

convolution deep-learning cnn computer-vision
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Activation Functions

Interactive gallery of neural network activation functions. Compare ReLU, GELU, Swish, Sigmoid, and more with their derivatives.

activation-functions deep-learning neural-networks visualization
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Loss Function Explorer

Compare loss functions interactively. Drag predictions to see how MSE, cross-entropy, Huber, focal loss, and more respond.

loss-functions machine-learning optimization visualization
New alpha

Diffusion Visualizer

Watch forward and reverse diffusion processes on 2D point clouds. Understand how diffusion models add and remove noise.

diffusion generative-models deep-learning visualization
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Confusion Matrix

Build confusion matrices from predictions. Get precision, recall, F1-score per class with interactive visualization.

classification metrics machine-learning evaluation
New alpha

Embedding Explorer

Visualize high-dimensional embeddings in 2D/3D with PCA and t-SNE. Interactive scatter plots with nearest neighbor search.

embeddings dimensionality-reduction pca tsne
New alpha

MCMC Visualizer

Watch Metropolis-Hastings and HMC sample from 2D distributions. See trace plots, diagnostics, and convergence in real-time.

mcmc bayesian sampling metropolis-hastings
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Genetic Algorithm Visualizer

Watch evolution solve optimization problems. TSP routes, function optimization, and string evolution with configurable GA parameters.

ai optimization evolutionary algorithms
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Clustering Visualizer

Place points and watch K-Means, DBSCAN, and hierarchical clustering algorithms group them step by step.

machine-learning clustering unsupervised visualization
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Decision Tree Builder

Build classification and regression trees from data. Visualize splits, feature importance, and decision boundaries step by step.

machine-learning classification decision-tree visualization
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Reinforcement Learning Playground

Train RL agents with Q-Learning, SARSA, Expected SARSA, and Monte Carlo on grid worlds. Watch policies evolve with Q-value heatmaps and policy arrows.

reinforcement-learning machine-learning q-learning sarsa
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Neuroevolution Playground

Evolve neural networks using genetic algorithms to solve Cart-Pole, Flappy Bird, and Maze Runner tasks. Watch populations improve in real time.

neuroevolution genetic-algorithm neural-network machine-learning
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Transformer Attention Visualizer

Visualize self-attention, multi-head attention, and positional encoding in transformers. Type text and see attention heatmaps update live.

transformer attention machine-learning nlp
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Backpropagation Visualizer

Step through forward and backward passes in a neural network. See gradients flow, weights update, and the chain rule in action.

backpropagation neural-network machine-learning gradient
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GAN Playground

Train a generative adversarial network on 2D distributions. Watch generator and discriminator compete in real time with decision boundary visualization.

gan generative adversarial machine-learning
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Word Embedding Trainer

Train Word2Vec skip-gram embeddings on small corpora. Visualize word relationships, solve analogies, and explore semantic space.

word2vec embeddings nlp machine-learning
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Gradient Boosting Visualizer

Step through gradient boosting tree-by-tree. See residuals, new trees, and predictions improve at each round.

machine-learning visualization interactive education
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Dimensionality Reduction Explorer

Apply PCA, t-SNE, and UMAP to datasets and watch 2D projections animate. Adjust hyperparameters and see clusters form.

machine-learning visualization interactive education
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Neural Network Loss Landscape

3D visualization of a loss surface with animated optimizer paths. Compare SGD, Adam, and RMSprop trajectories.

machine-learning deep-learning visualization interactive
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Tokenizer Comparison

Type text and see how BPE, WordPiece, and character-level tokenizers break it down. Compare token counts and efficiency.

machine-learning nlp visualization interactive

Mathematics & Statistics

Fourier, probability, linear algebra, and statistical testing

27
New beta

Fourier Transform

Draw a signal and see its frequency decomposition. Watch epicycles reconstruct waveforms one harmonic at a time.

fourier signal-processing math visualization
New beta

Probability Distributions

Explore probability distributions interactively. Adjust parameters, compare shapes, sample points, and calculate probabilities.

probability statistics distributions visualization
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Bezier Curve Editor

Drag control points to shape Bezier curves. Watch de Casteljau's algorithm animate the construction step by step.

bezier curves graphics math
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Linear Algebra

Visualize 2D matrix transformations. See rotation, scaling, shearing, eigenvalues, and grid deformation in real-time.

linear-algebra matrices transformations math
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Markov Chain Simulator

Build Markov chains, simulate random walks, and watch convergence to stationary distributions. Includes text generation mode.

markov probability stochastic simulation
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Voronoi / Delaunay Visualizer

Create Voronoi diagrams and Delaunay triangulations interactively. Animate Fortune's algorithm, Lloyd relaxation, and explore dual graphs.

computational-geometry voronoi delaunay algorithms
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A/B Test Calculator

Calculate statistical significance for A/B tests. Z-test, Bayesian analysis, power curves, and sample size estimation.

statistics ab-testing hypothesis-testing data-science
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Epidemic Simulator

SIR/SEIR epidemic modeling with both ODE and agent-based simulation. Adjust R0, vaccination, quarantine, and social distancing.

epidemic sir simulation public-health
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Strange Attractors

Visualize chaotic systems: Lorenz attractor, Rossler, double pendulum, bifurcation diagrams. 3D trajectories with Lyapunov exponents.

chaos attractors lorenz dynamical-systems
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Calculadora Hipotecaria

Simula tu credito hipotecario con enganche, tasa, amortizaciones anticipadas y graficas comparativas de escenarios.

finance math simulation visualization
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Personal Finance Simulator

Project your finances over time with multiple accounts, loans, income sources, and expenses. Visualize net worth, cashflow, and debt paydown.

finance simulation visualization calculator
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Investment Portfolio Simulator

Monte Carlo simulation of portfolio growth with asset allocation, inflation, fees, and probability cones over 1-40 year horizons.

finance simulation visualization monte-carlo
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Compound Interest Visualizer

Animated visualization of compound interest showing the snowball effect with adjustable rate, contributions, and compounding frequency.

finance math visualization interactive
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Supply & Demand Simulator

Drag supply and demand curves to see equilibrium, surplus, deadweight loss, price floors and ceilings update in real-time.

economics simulation interactive education
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Amortization Race

Race multiple loan repayment strategies against each other with animated bar charts showing balances declining over time.

finance simulation visualization interactive
New alpha

Dice & Probability Lab

Roll dice, flip coins, explore sample spaces, and watch the Law of Large Numbers in action. From basic combinatorics to convergence.

New beta

Evolution of Cooperation

Prisoner's Dilemma tournament where strategies compete in a population. Watch cooperation emerge or collapse through generations.

game-theory simulation emergence interactive
New alpha

Central Limit Theorem

Sample from any distribution and watch the sampling distribution of the mean converge to Normal. Interactive CLT demonstration.

New beta

Hypothesis Testing Visualizer

Visual t-tests, z-tests, and chi-squared tests. See rejection regions, p-values, and explore Type I/II errors and statistical power.

statistics hypothesis-testing p-value power-analysis
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Voting Systems Explorer

Compare plurality, ranked-choice, approval, and Condorcet voting with the same voter preferences on a 2D political compass.

game-theory simulation interactive education
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Bootstrap Resampling

Draw samples, resample with replacement, and build confidence intervals without parametric assumptions. Compare bootstrap vs. classical CIs.

statistics bootstrap confidence-intervals resampling
New alpha

Monte Carlo Methods

Estimate pi by throwing darts, compute integrals with random sampling, and explore rejection sampling and importance sampling with variance reduction.

New alpha

GLM Explorer

Interactive Generalized Linear Models: choose distribution families, link functions, fit data with IRLS, and diagnose residuals. From linear to logistic to Poisson regression.

New beta

Bayesian Inference Playground

Interactive Bayes' theorem visualizer. Drag prior distributions, observe evidence, watch posteriors update with animation.

statistics math visualization interactive
New beta

Calculus Visualizer

See the geometric meaning of derivatives and integrals. Draw functions, adjust Riemann sums, and explore Taylor series.

math visualization interactive education
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Complex Number Visualizer

Explore complex number operations on the Argand plane. See multiplication as rotation, roots of unity, and conformal mappings.

math visualization interactive education
New beta

System Dynamics Simulator

Draw causal loop diagrams with nodes and arrows, then simulate feedback systems. Explore predator-prey, climate, and economic cycles.

simulation emergence visualization interactive

Algorithms & Data Structures

Sorting, pathfinding, graphs, compression, and fractals

7
New beta

Sorting Visualizer

Watch sorting algorithms race with animated bar charts. Compare Bubble, Quick, Merge, Heap, and more side by side.

sorting algorithms computer-science visualization
New beta

Cellular Automata

Conway's Game of Life and Wolfram's elementary rules. Draw patterns, adjust rules, and watch emergence unfold.

cellular-automata game-of-life simulation emergence
New beta

Graph Algorithms

Draw graphs and visualize BFS, DFS, Dijkstra, A*, and MST algorithms step by step. See queues, distances, and paths animate.

graphs algorithms pathfinding computer-science
New beta

Data Structures

Visualize BST, AVL trees, heaps, hash tables, and linked lists with animated insert, delete, and search operations.

data-structures trees algorithms computer-science
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Pathfinding Visualizer

Watch BFS, DFS, Dijkstra, and A* explore grids step by step. Draw walls, generate mazes, compare algorithms.

algorithms graph-theory pathfinding visualization
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Compression Visualizer

Watch Huffman coding, LZW, and RLE compress data step by step. See tree construction, dictionary growth, and bit-level encoding.

algorithms compression huffman information-theory
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L-System Fractal Generator

Generate fractals with L-system rewrite rules and turtle graphics. Koch snowflakes, dragon curves, fractal trees, and custom patterns.

fractals generative l-system turtle-graphics

Computer Science Theory

Turing machines, automata, state machines, and memory

11
New beta

State Machine Designer

Draw finite automata, test input strings, and see DFA/NFA execution step by step. Build and visualize state machines interactively.

automata state-machine dfa nfa
New alpha

Regex to Automaton

Convert regular expressions to NFA and DFA. Watch Thompson's construction and step through pattern matching visually.

regex automata nfa dfa
New beta

Turing Machine Simulator

Simulate Turing machines with visual tape, head movement, and state transitions. Includes classic programs like Busy Beaver.

computer-science automata turing-machine computation
New beta

Memory Allocator Visualizer

Visualize heap memory allocation with malloc/free operations. Compare First Fit, Best Fit, Buddy System, and see fragmentation in action.

systems memory operating-systems algorithms
New beta

Garbage Collector Visualizer

Visualize mark-and-sweep, reference counting, and generational garbage collection. Create object graphs and watch GC algorithms collect unreachable objects.

garbage-collection memory computer-science algorithms
New beta

CPU Pipeline Simulator

Visualize instruction pipelining with data hazards, forwarding, branch prediction, and pipeline stalls. Step through clock cycles.

cpu pipeline computer-architecture hazards
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Database Index Visualizer

Visualize B-Tree, B+ Tree, and Hash Index operations. Watch insertions split nodes, deletions merge them, and searches traverse the tree.

database b-tree index data-structures
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OS Process Scheduler

Simulate FCFS, SJF, Round Robin, and Priority scheduling with animated Gantt charts and performance metrics.

computer-science simulation visualization interactive
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Virtual Memory & Page Replacement

Simulate FIFO, LRU, Optimal, and Clock page replacement algorithms. Visualize page tables, frames, and page faults.

computer-science simulation visualization interactive
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Compiler Pipeline Visualizer

Type code and watch it transform through lexing, parsing, AST, optimization, and code generation stages.

computer-science visualization interactive education
New beta

How Search Engines Work

Build a mini web graph, run a crawler, compute PageRank, and execute search queries to understand web search.

computer-science visualization interactive education

Graphics & Creative

Shaders, ray tracing, pixel art, and procedural generation

10
New beta

Color Palette Generator

Generate accessible color palettes for data visualization. Contrast checks, colorblind simulation, and multiple export formats.

color accessibility design data-visualization
New beta

Shader Playground

Write GLSL fragment shaders with live WebGL preview. Create plasma, fire, fractals, and more with GPU-accelerated graphics.

glsl webgl shaders graphics
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Perlin Noise Generator

Generate and visualize Perlin and Simplex noise. Adjust octaves, persistence, and frequency. Terrain heightmaps, cloud textures, and more.

generative noise procedural graphics
New beta

Ray Tracer

Real-time software ray tracer with reflections, refractions, and Phong shading. Drag objects, adjust materials, and watch rays bounce.

graphics ray-tracing 3d rendering
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Pixel Art Editor

Create pixel art with pencil, fill, line, and shape tools. Layers, animation frames, undo/redo, and PNG/GIF export.

creative pixel-art drawing editor
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Fractal Explorer

GPU-accelerated Mandelbrot and Julia set explorer with infinite zoom, multiple color palettes, and WebGL shaders.

fractal mandelbrot julia-set webgl
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Flow Field Generator

Perlin noise flow fields with particle trails. Adjust noise, colors, and particle behavior. Export as SVG or PNG.

generative graphics visualization interactive
New beta

Tessellation Designer

Create Escher-style tessellations by deforming base tiles. The tiled plane updates in real-time as you drag control points.

generative graphics math interactive
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Lissajous Curve Lab

Draw Lissajous curves from two perpendicular sine waves. Adjust frequencies, phase, and damping for oscilloscope-like patterns.

math graphics visualization interactive
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Spirograph

Digital spirograph with adjustable gear ratios. Create hypotrochoid and epitrochoid curves with animated pen drawing.

math graphics visualization interactive

Developer Tools

Regex, JSON, JWT, SQL, hashing, and encoding utilities

14
New beta

Regex Tester

Live regex testing with match highlighting, group extraction, and replacement preview. Runs entirely in your browser.

regex testing pattern-matching developer-tools
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JSON Schema Validator

Validate JSON data against JSON Schema with detailed error reporting. Powered by Ajv.

json schema validation developer-tools
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JWT Decoder

Decode and inspect JSON Web Tokens. See header, payload, claims, and expiry status with live countdown.

jwt authentication security developer-tools
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Cron Parser

Parse cron expressions with visual timeline, human-readable descriptions, and next execution times.

cron scheduling devops developer-tools
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Diff Viewer

Compare two texts side by side with line-level and word-level diff highlighting. Like git diff in your browser.

diff comparison text developer-tools
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Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512, and CRC32 hashes for text or files. Compare hashes and compute HMACs.

hash crypto security developer-tools
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Timestamp Converter

Convert between Unix timestamps and human-readable dates. Timezone support, date math, and multiple output formats.

timestamp unix date timezone
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Base Converter

Convert between binary, hex, decimal, and octal with bit visualization and IEEE 754 float inspector.

binary hex number-systems ieee754
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QR Code Generator

Generate QR codes for text, URLs, WiFi, and vCards. Customize colors, size, and error correction. Download as PNG or SVG.

qr-code generator encoding developer-tools
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SQL Playground

Write and execute SQL queries in the browser. SQLite via WebAssembly with preset databases, schema viewer, and query history.

database sql sqlite developer-tools
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JSON Visualizer

Explore JSON data with collapsible tree view, searchable table, syntax-highlighted code view, JSONPath queries, and structure statistics.

json data developer-tools visualization
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Markdown Previewer

Live split-pane Markdown editor with from-scratch GFM parser. Headings, tables, task lists, code blocks, and more with instant preview.

markdown editor preview developer-tools
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Mermaid Diagram Visualizer

Create flowcharts, sequence diagrams, class diagrams, and more with live Mermaid preview. 10 diagram types with preset examples.

mermaid diagrams flowchart visualization
New beta

How Git Works

Visual explanation of Git internals. Create commits, branches, merge and rebase — see the DAG update in real-time.

developer-tools visualization interactive education

Audio & Music

Audio analysis, music theory, and Web Audio experiments

2
New beta

Audio Visualizer

Real-time audio visualization with waveform, spectrum analyzer, and spectrogram. Use your microphone, upload files, or generate tones.

audio visualization web-audio fft
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Music Theory Visualizer

Interactive piano keyboard, circle of fifths, scales, and chord progressions with Web Audio playback.

music audio theory interactive

Python

Browser-based Python REPL and code execution visualizer

2
New beta

Python REPL

Run Python code directly in your browser. Powered by Pyodide with NumPy pre-loaded.

python repl pyodide wasm
New alpha

Python Tutor

Step-by-step Python execution visualizer. See stack frames, heap objects, and pointer arrows as your code runs.

python visualizer debugger education

Systems & Networking

Network protocols, blockchain, and physics simulation

17
New beta

Physics Sandbox

Simulate pendulums, springs, projectiles, collisions, and orbits. Adjust parameters and watch physics unfold in real-time.

physics simulation mechanics pendulum
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Blockchain Visualizer

Mine blocks, see hash chaining, and detect tampering. Interactive proof-of-work demonstration with adjustable difficulty.

blockchain cryptography hashing distributed-systems
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Network Protocol Visualizer

Animated TCP handshakes, HTTP request flows, DNS resolution, and TLS negotiation. Step through network protocols visually.

networking protocols tcp http
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Fluid Simulation

Interactive 2D fluid dynamics using Stable Fluids. Inject dye, create turbulence, and place obstacles. Real-time Navier-Stokes simulation.

fluid simulation physics navier-stokes
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Particle Life

Emergent artificial life from simple attraction and repulsion rules between colored particle species. Watch organisms self-organize.

particle artificial-life emergence simulation
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Wave Simulation

2D wave equation simulation with interference, diffraction, Doppler effect, and Young's double slit experiment. Drop stones in a virtual ripple tank.

waves physics simulation interference
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Orbital Mechanics

N-body gravitational simulation with Kepler orbits, Lagrange points, and gravity assists. Launch satellites and watch orbits evolve.

orbital gravity physics simulation
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Boids Flocking

Craig Reynolds' flocking simulation with separation, alignment, and cohesion. Add predators, obstacles, and wind. Watch emergent swarm behavior.

boids flocking swarm simulation
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Reaction-Diffusion

Gray-Scott reaction-diffusion generating Turing patterns — spots, stripes, spirals, and coral. Paint chemicals and watch patterns self-organize.

reaction-diffusion turing-patterns simulation gray-scott
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Segregation Simulator

Schelling's segregation model — agents with mild same-neighbor preference produce dramatic segregation patterns.

simulation emergence interactive education
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Cloth Simulation

Verlet integration cloth physics. Drag, pin, and tear cloth with adjustable gravity, wind, and stiffness.

physics simulation interactive graphics
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Electromagnetic Field Visualizer

Place charges on a canvas and see electric field lines, vector arrows, and equipotential surfaces update in real-time.

physics simulation visualization interactive
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Optics Bench

Virtual optical bench with drag-and-drop lenses, mirrors, and prisms. See ray tracing, focal points, and dispersion in real-time.

physics simulation visualization interactive
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Entropy & Maxwell's Demon

Play as Maxwell's Demon sorting hot and cold particles. Watch entropy, temperature, and information cost in real-time.

physics simulation interactive education
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Pendulum Lab

Single, double, and triple pendulum simulator. The double pendulum demonstrates chaos — tiny changes produce wildly different paths.

physics simulation visualization interactive
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DNS Resolver Visualizer

Type a domain and watch recursive DNS resolution animate step by step through root, TLD, and authoritative servers.

networking visualization interactive education
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TCP Handshake & Congestion

Visualize TCP 3-way handshake, sliding window, and congestion control with animated packets between client and server.

networking visualization interactive education

Life & Personal

Tax, career, nutrition, sleep, habits, and decision-making tools

11
New beta

Mexican Tax Simulator (SAT/ISR)

Simulate your Mexican annual tax declaration with ISR brackets, deductions, and regime comparison. See your effective rate and potential refund.

tax mexico SAT ISR
New beta

Nutrition & Macro Planner

Calculate your TDEE, set macro targets, build meal plans with Mexican foods, and project weight changes over time.

nutrition health macros diet
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Career Trajectory Modeler

Model your career path with Mexican labor benefits, salary projections, and scenario comparison. Compare staying, job-hopping, freelancing, or getting a degree.

career salary planning mexico
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Weighted Decision Matrix

Compare options across weighted criteria with sensitivity analysis and radar charts. Make better decisions with structured analysis.

decision analysis comparison matrix
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Mexican Investment Comparator

Compare CETES, BONDDIA, SOFIPOs, ETFs, PPR, and real estate side-by-side. See real after-tax, after-inflation yields.

investment mexico CETES finance
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Housing Buy vs Rent Simulator

Compare buying vs renting in Mexico with Infonavit, bank mortgages, property appreciation, and investment opportunity cost analysis.

housing mortgage rent mexico
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Sleep & Energy Optimizer

Model your sleep cycles, track caffeine timing, calculate sleep debt, and optimize your schedule based on your chronotype.

sleep health energy circadian
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Habit Compounding Visualizer

Track habits, visualize streaks, and project the compounding effect of daily actions over months and years.

habits productivity compounding tracking
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Argument Analyzer

Break down arguments into premises and conclusions, detect logical fallacies, assess argument strength, and explore common argument forms.

logic critical-thinking fallacies reasoning
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Life Tradeoff Visualizer

Allocate 168 hours/week across life categories. Model life phases, see opportunity costs, and understand the true cost of your commitments.

time life balance tradeoffs
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Total Compensation Calculator

Compare job offers across salary, equity, bonuses, benefits, and 18 non-monetary satisfaction factors with weighted scoring.

career compensation salary comparison