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browse all- Distributed Systems & Network Topology SimulatorBuild a network topology from load balancers, API gateways, microservices, message queues, distributed databases and caches, then inject chaos — kill nodes, partition the network, packet loss, latency spikes, circuit breaker trips — and watch Raft leader election, split-brain and Hystrix-style breaker state react live. Export the topology as Docker Compose, Kubernetes manifests, Mermaid or PlantUML. Entirely client-side, educational simulation.Development Utilities
- Typography Anatomy & Variable Font LabLoad a TTF/OTF/WOFF/WOFF2 font and inspect glyph Bézier outlines, baseline/x-height/cap-height guides, kerning pairs, OpenType features and live variable-font axis sliders — export CSS @font-face, font-variation-settings and fallback metric overrides.Design Tools
- Pixel Art Sprite StudioDraw retro pixel art on an 8x8 to 64x64 grid with pencil, flood-fill, ordered-dither and symmetry tools, curated PICO-8/Game Boy/NES/C64/Endesga-32 palettes, multi-layer compositing, and a frame timeline with onion skinning. Export static PNG, animated PNG, GIF, a sprite-sheet atlas (Pixi/Phaser/Godot/Unity JSON), or a CSS steps() animation snippet.Design Tools
- Digital Logic Gate & Circuit SimulatorBuild digital circuits from AND/OR/NOT/NAND/NOR/XOR/XNOR gates, tri-state buffers, switches, clocks and 7-segment displays; wire flip-flops, latches and multiplexers into adders and counters. Runs an event-driven propagation-delay simulation with High-Z and driver-conflict detection, packages sub-circuits into reusable ICs, and exports a truth table, K-Map minimization, Verilog, VHDL, and a documented JSON+SVG schematic. Everything runs client-side; circuits never leave the browser.Development Utilities
- 2D Fluid Dynamics & Particle Physics SandboxA physics playground with two engines sharing one canvas. The fluid mode runs a real Eulerian Navier-Stokes solver — semi-Lagrangian advection, explicit diffusion, Jacobi pressure projection and vorticity confinement — that you paint with dye and velocity using mouse or touch. The particle mode is a damped Verlet N-body engine with gravity wells, Coulomb attractors and repulsors, spring links, wall restitution and elastic circle collisions. Particle counts adapt to the device (100k target on WebGL2 desktop, 2k-5k on CPU fallback), and every configuration exports as runnable code: a Matter.js world, a PixiJS ticker setup, or a standalone vanilla Canvas engine.Development Utilities
- GLSL Shader Art & Visual FX PlaygroundA live GLSL fragment-shader laboratory running on WebGL2 with the full Shadertoy uniform set (iResolution, iTime, iTimeDelta, iFrame, iMouse, iChannel0..3). Write shaders with syntax highlighting and see them recompile on every keystroke, with compiler errors mapped back to your line numbers and highlighted in the editor, plus a live FPS counter. The gallery ships raymarched spheres, tori and a Mandelbulb fractal, Voronoi and FBM procedural noise, cyberpunk grids, plasma waves, a neon audio visualizer and matrix rain. Export any shader as Three.js ShaderMaterial code, a React Three Fiber component, a standalone single-file WebGL2 HTML page or plain GLSL — or record the canvas straight to WebM video. A Canvas2D plasma fallback keeps the tool usable where WebGL2 is unavailable.Development Utilities
- Web Audio Modular Synthesizer & Sound FX GeneratorA full synth voice designer running entirely in your browser: seven oscillator flavors (sine, saw, triangle, square with real PWM duty control, white/pink/brown noise), a visual ADSR envelope, resonant biquad filtering, an LFO routed to pitch, filter or gain, and an effects chain of tanh overdrive, stereo ping-pong delay and Schroeder reverb. Play the two-octave keyboard with your mouse, the printed computer keys (A W S E D…) or a Web MIDI controller, watch the live FFT spectrum and scrolling waterfall spectrogram, fire retro game SFX one-shots (jump, laser, coin, powerup, explosion, click), then export your sound as 8/16/24-bit WAV or as dependency-free Web Audio code you can paste into any project.Sound Tools
- Cellular Automata StudioSix cellular automaton models in one playground: Conway's Game of Life with any B.../S... rule (HighLife, Seeds, Day & Night), Wireworld logic circuits, Langton's Ant turmites with custom turn strings, Wolfram elementary automata (Rule 30/90/110/184), Brian's Brain and Star Wars. Toroidal or bounded grids, cell-age heatmap coloring, 1–120 FPS playback with single-step mode, a pattern template library (Gosper glider gun, pulsar, acorn, diehard, spaceships), LifeWiki RLE import/export, animated GIF recording and bit-packed matrix exports in C, Rust and JavaScript. Everything computes in a Web Worker in your browser.Development Utilities
- Algorithm Arena & Data Structure VisualizerInteractive arena for algorithms and data structures: eight sorting algorithms racing on one seeded input, six pathfinding algorithms walking generated mazes, and BST, AVL, Red-Black, B-tree, heap and trie operations replayed step by step with rotations highlighted. Every run shows the Big-O table and the phase-highlighted reference implementation in four languages, and compared values can be played as pitch (sonification) through the shared audio engine. Everything runs client-side; inputs never leave the browser.Development Utilities
- Interactive RegEx Railroad & DFA/NFA StepperTurn any JavaScript regex into a railroad diagram and an NFA/DFA state graph, then single-step its backtracking engine with a live backtrack counter and ReDoS risk scoreDevelopment Utilities
Most used on DevTools
Data Generators
Generate valid test identities, bank accounts and tax numbers for your development and QA environments — no real data involved.
National Identity Generator
Checksum-valid national IDs — TC Kimlik, SSN, Emirates ID, CPF, NRIC and more.
Tax Number Generator
Format-valid tax IDs — VKN, EIN, TFN, Steuernummer, VAT, UEN and more.
IBAN & SWIFT Generator
Validate, format and generate IBANs plus SWIFT/BIC codes.
Barcode Generator
Generate CODE128, EAN, UPC and more — download as SVG or PNG.
Base64 Toolbox
Encode and decode text, files and images with Base64, Base64URL and Data URI support.
YouTube Thumbnail Downloader
Preview and download every available thumbnail size from a YouTube, Shorts or live link.
Browse by category
Every tool runs in your browser — pick a category to dive in, or press ⌘K to search.
Color Tools
Color utilities and generators
Color Blindness Simulator · Color Contrast Checker · Color Converter
Design Tools
Theme builders and design asset generators
Aspect Ratio Calculator · Border Radius Generator · Box Shadow Generator
Data Processing
Format, convert and process data
Base64 Toolbox · C# to VB.NET Converter · CSV Data Viewer
Text & Analysis
Text processing and analysis tools
Binary Text Translator · Case Converter & Text Formatter · Character Frequency Analyzer
Generators
Generate IDs, references and more
Address Generator · ASCII Text Art Generator · Credit Card Generator
Security Tools
Security analysis and authentication tools
AES Encryption · Basic Auth Generator · Bcrypt Generator & Verifier
Network & API Tools
HTTP clients and network utilities
API Mock Server · Bandwidth Calculator · Broken Link Checker
Development Utilities
Essential utilities for developers
.htaccess Generator · 2D Fluid Dynamics & Particle Physics Sandbox · Algorithm Arena & Data Structure Visualizer
Visual Tools
Preview and convert visual content
Barcode Generator · Base64 Image Encoder · EXIF Viewer & Cleaner
Creator & Business Tools
Privacy-first helpers for creator payouts and business workflows
Code Snippet to Image · Creator Tax Form Guide · Freelance Invoice Generator
Media & Audio
Record, convert and edit audio and video in your browser
Audio Trimmer & Cutter · Screen & WebCam Recorder · Video to GIF Maker
Sound Tools
Synthesizers, sound effects and sound generation in your browser
Ambient Noise Generator · Text to Speech (TTS) · Web Audio Modular Synthesizer & Sound FX Generator
Financial Tools
Loan, interest, tax and currency calculators
Compound Interest Calculator · Currency Converter · Discount & VAT Calculator
Productivity Tools
Focus timers, health calculators and speed tests
BMI & TDEE Calculator · Pomodoro Focus Timer · Typing Speed Test
AI Tools
Assemble context, manage prompts and prep RAG data for LLM workflows
AI Code Explainer · AI Commit Message Generator · AI Documentation Generator
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