Development Utilities
Everyday developer utilities: cron expression builder, Dockerfile and .gitignore generators, mock data, slug and meta tag tools, Tailwind helpers and more.
146 free tools — no ads, no sign-up, everything runs in your browser.
.env Secret Safety Linter
Validate .env syntax and spot likely leaked credentials or placeholder secrets.
.htaccess Generator
Build an Apache .htaccess — HTTPS redirects, rewrites, error pages, security headers, and basic auth
2D Fluid Dynamics & Particle Physics Sandbox
A 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.
AI Function Calling Schema Generator
Generate function calling JSON schemas from TypeScript interfaces
Algorithm Arena & Data Structure Visualizer
Interactive 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.
Ansible Playbook Generator
Build an Ansible playbook — hosts, vars, and tasks with modules — as YAML
Apache Config Generator
Build an Apache 2.4 VirtualHost — ServerName, DocumentRoot, Directory, aliases, and optional SSL
Arrow IPC Stream Viewer
Inspect Apache Arrow IPC streams and Feather files in your browser.
ASN.1 DER/BER Decoder
Decode ASN.1 DER and BER hexadecimal bytes into a recursive tree and hex dump entirely in your browser.
Audio Waveform to SVG
Generate minimal SVG waveform paths from audio samples
Avro Schema to TypeScript
Convert Apache Avro schemas into deterministic TypeScript and JSON Schema entirely in your browser.
AWS Architecture Diagram
Drag-and-drop AWS service blocks, connect edges and export architecture diagrams as SVG
AWS IAM Least-Privilege Generator
Generate scoped AWS IAM policies from service and action templates
AWS Pricing Calculator
Estimate monthly AWS costs from static list prices with a Chart.js breakdown
Azure Architecture Diagram
Compose Azure architecture diagrams with VM, Storage, Functions, AKS blocks and SVG export
Azure ARM Template Generator
Generate Azure Resource Manager JSON templates with storage, App Service and Key Vault presets
B-Tree & B+ Tree Index Visualizer
Visualize B-tree and B+ tree database indexes
Backtracking Solver Lab
Solve Sudoku and N-Queens constraint problems with deterministic backtracking and live search statistics in your browser.
Bash POSIX Portability Checker
Find Bashisms and improve shell script portability
Batch Regex Replace Simulator
Preview ordered regular expression replacements across multiple virtual files without uploading data.
Big-O Complexity Comparator
Compare algorithm complexity growth curves and operation counts entirely in your browser.
Birthday Paradox Hash Collision Calculator
Estimate hash collision probability, log-space safe even for very large record counts. Nothing leaves your browser.
Bitwise & IEEE-754 Explorer
Inspect 32/64-bit floating-point fields and calculate 32-bit bitwise operations locally.
Bloom & Cuckoo Filter Simulator
Simulate Bloom and Cuckoo filters with deterministic hashing and false-positive statistics
Browser Compatibility Checker
Search web platform features and compare Baseline status with Chrome, Firefox, and Safari support
BSON to JSON & Hex Decoder
Encode JSON to BSON and decode BSON hex with a classic hex dump
Caddyfile Builder
Generate and validate Caddy Server Caddyfiles
Cellular Automata Studio
Six 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.
CHANGELOG Generator
Write a clean, consistent CHANGELOG entry in the Keep a Changelog format from grouped Added, Changed, Deprecated, Removed, Fixed, and Security notes
Chmod Calculator
Calculate Linux file permissions (777, 755 etc) easily.
Chmod Octal & Symbolic Permission Matrix
Convert Unix chmod modes between octal and symbolic notation with special bits.
CircleCI Config Generator
Generate a .circleci/config.yml — jobs with Docker images and run steps wired into a workflow
Cloud-Init Generator
Generate and validate secure Cloud-Init user-data YAML for Linux servers
CloudFormation Template Generator
Generate AWS CloudFormation YAML with S3, EC2, Lambda, IAM and DynamoDB resource presets
Code Diff & Patch Generator
Generate and apply strict LCS-based unified diffs entirely in your browser.
Convex Hull Algorithm Visualizer
Visualize Graham scan and Jarvis march convex hull algorithms
Cron Expression Builder
Build and validate cron expressions with visual interface and presets
Crontab Natural Language & Next Runs Heatmap
Parse cron schedules, explain them in plain English, and visualize the next 50 local runs. Nothing leaves your browser.
CSS Grid Named Areas Builder
Visually paint CSS Grid named areas and generate deterministic grid-template-areas, track sizes, and grid-area rules.
CSS Scroll-Driven Animations & Timeline Builder
Generate deterministic CSS scroll-driven animation timelines, view ranges, keyframes, and progressive fallback rules.
CSS View Transitions API Animation Lab
Generate deterministic CSS View Transitions API animations for root and named transition pairs.
CSS/JS Minifier
Minify your CSS and JavaScript code to reduce file size.
CSV Type & Null Ratio Profiler
Profile CSV column types, null ratios, and distributions
Database Connection String Builder
Build and URL-encode connection strings for PostgreSQL, MySQL, MongoDB, Redis and SQLite from a simple form — with JDBC and key/value variants
Date Calculator
Calculate the difference between two dates or add/subtract days, weeks, months and years
Design Tokens to Code
Convert W3C Design Tokens JSON into deterministic CSS custom properties, Tailwind theme/config, or SwiftUI extensions.
Digital Logic Gate & Circuit Simulator
Build 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.
Distributed Systems & Network Topology Simulator
Build 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.
Docker Compose Builder
Build a valid docker-compose.yml from a visual form — services, images, ports, volumes, environment variables, restart policies and dependencies
Docker Run to Compose Converter
Convert a docker run command into a docker-compose.yml service definition with full flag support
Dockerfile Builder
Visual Dockerfile generator with multi-stage builds, common base images, .dockerignore, and best practices for Node.js, Python, Go, Rust, and more.
Dockerfile Layer Optimizer
Analyze Dockerfiles for layer efficiency, cache stability, and multi-stage build opportunities.
DuckDB WASM Playground
Run DuckDB SQL analytics on local files in your browser.
Environment Variable Encoder/Decoder
Encode, decode, and format environment variables for secure deployment
EXIF GPS Map Reverser
Extract EXIF GPS coordinates and visualize a photo location
FFT Fourier Decomposition
Decompose signals into frequency components with an interactive FFT
Figlet ASCII Typography & ANSI Banner Studio
Create deterministic monospace ASCII banners with five embedded Figlet-style fonts, spacing, and unknown-character warnings. Nothing leaves your browser.
FSM & Turing Machine Simulator
Simulate deterministic finite state and Turing machines
GCP Architecture Diagram
Design GCP architecture diagrams with Compute, GCS, GKE, Cloud Run and export SVG
GeoJSON to TopoJSON & WKT Converter
Convert GeoJSON FeatureCollections into deterministic TopoJSON and WKT entirely in your browser.
GeoTIFF Boundary Extractor
Inspect GeoTIFF metadata and calculate georeferenced bounding boxes entirely in your browser.
Git Commit Message Builder
Build conventional commit messages with type, scope, body, and breaking changes. Follow commitlint standards and generate properly formatted commits.
GitHub Actions Matrix & Runner Budget Calculator
Generate GitHub Actions matrix combinations with exclude/include semantics and estimate runner minutes and cost.
GitHub Actions YAML Generator
Generate GitHub Actions workflow YAML with triggers, jobs, and steps through a visual form
Gitignore Auditor
Audit your existing .gitignore against 55+ official github/gitignore templates — instantly see missing, redundant and outdated patterns for your stack, with a one-click corrected file.
Gitignore Generator
Build a .gitignore from 55+ official github/gitignore templates, or audit an existing one to find missing, redundant and outdated patterns — pick your stack and generate or review, all client-side.
GitLab CI Generator
Generate a .gitlab-ci.yml from stages and jobs — images, scripts, artifacts, and branch rules
GLSL Shader Art & Visual FX Playground
A 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.
GPIO Pinout Interactive Visualizer
Explore Raspberry Pi, ESP32, and Arduino Uno pin functions
Grafana Panel Generator
Generate Grafana dashboard panel JSON
Hallucination Entropy Analyzer
Estimate token uncertainty from top-k probability distributions
Helm Chart Generator
Generate a Helm chart scaffold — Chart.yaml, values.yaml, and Go-templated Deployment, Service, Ingress and _helpers.tpl. Configure image, replicas, service and ingress, then copy each file.
Helm Values Diff & Merge
Deep-merge Helm chart values and compare added, changed, and deleted YAML paths
HTML Editor
Online HTML editor with live preview. Write HTML, CSS, and JavaScript and see the results in real-time.
HTML Minifier
Minify HTML by stripping comments and collapsing whitespace, while preserving pre/code/script/style content
HTML Table Generator
Convert CSV data into a clean, semantic HTML table
Huffman & Shannon-Fano Tree Visualizer
Build deterministic Huffman and Shannon-Fano prefix-code trees from text, with a code table, entropy, and compression metrics. Nothing leaves your browser.
Hyperlink Generator
Build HTML <a> tags visually — href, target, rel, accessibility and class attributes
IAM Policy Generator
Build AWS IAM policy JSON from a list of Allow/Deny statements
Interactive RegEx Railroad & DFA/NFA Stepper
Turn 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 score
JavaScript AST Visualizer
Visualize JavaScript AST trees, node counts, and deterministic JSON entirely in your browser.
Jenkins Pipeline Builder
Build a declarative Jenkinsfile — agent, environment, stages with shell steps, and post actions
JSON Schema to TypeScript
Compile draft-07 JSON Schema into deterministic TypeScript interfaces entirely in your browser.
JSON to Go Struct
Convert JSON into Go structs with correct types and JSON struct tags. Handles nested structures and slices for fast Go model scaffolding.
JSON to TypeScript
Convert JSON into TypeScript interfaces instantly. Infers types, handles nested objects and arrays, and generates clean, ready-to-use type definitions.
Karnaugh Map Solver
Simplify 2–4 variable Boolean functions with an interactive Karnaugh map, minimal SOP/POS forms, and don't-care optimization — entirely in your browser.
Kubernetes Ingress Route Visualizer
Turn Kubernetes Ingress and Service YAML into a Mermaid routing diagram
Kubernetes Manifest Generator
Generate Kubernetes YAML manifests visually — Deployment, Service, ConfigMap and Secret with replicas, resources, env vars, ports and service types. Copy or download ready-to-apply YAML.
Kubernetes Resource Calculator
Estimate CPU and memory requests, limits and HPA settings with downloadable YAML manifests
Lighthouse Audit Summary
Summarize a Lighthouse report into prioritized actions. Enter category scores or paste Lighthouse JSON to get grades, weakest areas, and a ranked improvement checklist.
Linux Sysctl Tuner
Calculate Linux kernel sysctl and network buffer settings
Lorem Ipsum Generator
Generate placeholder text in multiple styles for design and development
Lottie JSON Tweaker
Preview Lottie JSON animations and adjust embedded colors entirely in your browser.
Markdown Artifacts Previewer
Preview SVG and HTML artifacts from LLM markdown safely
MessagePack & CBOR Inspector
Inspect MessagePack and CBOR encodings byte by byte
MIME Type Detector
Detect MIME types from file content, extensions, or data URIs. Includes magic number detection, common file signatures, and browser compatibility info.
Mock Data Generator
Generate realistic test data in multiple formats for development and testing
Monorepo Dependency Graph Viewer
Visualize workspace package dependencies, detect cycles, and export deterministic Mermaid DAGs locally.
Morse Code Translator
Translate text to Morse code and decode Morse back to text, with adjustable speed
MP4 MOOV Atom Inspector
Inspect MP4 boxes and verify FastStart streaming layout
Multi-Language Code Editor
Lightweight textarea editor with syntax highlighting — no Monaco or CodeMirror
Multiple URL Opener
Open many URLs in new tabs with a configurable delay between each
NGINX Config Builder
Generate an NGINX server config from a visual form — reverse proxy, static hosting, SPA fallback, SSL termination and HTTP-to-HTTPS redirects
Nginx Reverse Proxy Wizard
Generate Nginx reverse proxy, WebSocket, SSL, and load-balancing configurations
Nomad to Kubernetes Converter
Convert HashiCorp Nomad HCL jobs to Kubernetes YAML
Offline Secret Leak Scanner
Detect API keys and secret leaks entirely in your browser
Open Source License Compatibility Matrix
Evaluate one-way compatibility between common open source dependency licenses and a project's license, including concrete obligations.
OpenAPI / Swagger Editor
Parse, validate, and preview an OpenAPI 3.x or Swagger 2.0 spec with an endpoint browser and formatted output
OpenTelemetry Collector Builder
Build OpenTelemetry Collector YAML pipelines
Parquet File Viewer
Inspect Apache Parquet schemas and preview rows entirely in your browser.
Programmer Calculator
Multi-base calculator with simultaneous binary, octal, decimal and hex views, bitwise AND/OR/XOR/NOT/shift operations, and IEEE 754 float inspection
Prometheus Alert Rule Builder
Build Prometheus alerting rules — groups, alerts, PromQL expressions, durations, labels, and annotations
Prompt Injection Sandbox
Test system prompts against injection and jailbreak patterns
PromQL Builder & Validator
Build and validate Prometheus PromQL queries and alert rules
PromQL Query Builder
Build Prometheus PromQL queries from a form with selectors, rate functions, and aggregations
Protocol Buffers AST Explorer
Parse .proto files and explore messages, enums, services, and RPC methods as a structured AST. Resolve field type references and export JSON — entirely in your browser.
Redis CLI Simulator
Practice Redis commands in an in-browser terminal. Run GET, SET, HSET, LPUSH, SADD, ZADD, EXPIRE, KEYS and more against a local store — no Redis server required.
Redis RDB Memory Estimator
Estimate Redis memory from key patterns, collection encodings, and allocator overhead
Regex to Code Generator
Convert regex patterns into ready-to-use code for JavaScript, Python, Go, Java, and PHP
RSS Feed Validator
Validate an RSS 2.0 or Atom feed for well-formedness and required elements
S3 Bucket Policy Generator
Generate an AWS S3 bucket policy JSON for a principal, actions, and key prefix
Scientific & Engineering Calculator
Six-mode math workstation: precision arithmetic, reactive notebook, 2D plotting, matrix algebra, statistics and engineering units
Semantic Version Calculator
Parse, compare and bump semantic versions (semver)
SemVer Range Intersection
Calculate shared versions across npm SemVer dependency ranges and validate a candidate version.
Service Worker Generator
Generate service worker scripts with cache strategies, precache lists, and registration snippets
Slug Generator
Convert any text into URL-friendly slugs. Perfect for creating clean URLs, permalinks, and SEO-friendly identifiers.
Social Media Card Simulator
Preview how a URL appears when shared on Twitter, Discord, and Slack.
SQLite WASM Studio
Run SQLite SQL and inspect schemas entirely in your browser.
SVG Displacement Filter Lab
Generate SVG turbulence and displacement map filter effects
SVG Path Morpher
Interpolate SVG paths and generate animation code
Synthetic Data Faker
Generate deterministic synthetic datasets from JSON Schema
Systemd Service & Timer Builder
Generate systemd service and timer unit files with scheduling and hardening options
Tailwind Theme to CSS Variables
Transpile Tailwind theme.extend values into deterministic CSS custom properties with color opacity helpers.
Terraform DAG Diagrammer
Convert Terraform HCL into a Mermaid dependency graph
Terraform HCL Visualizer
Paste Terraform HCL to visualize its structure — a block inventory of resources, data, variables, outputs, modules and providers, their attributes, and inferred ${...} dependency references.
Traefik Router Generator
Generate Traefik v2 and v3 dynamic routing YAML
Travis CI Config Generator
Generate a .travis.yml — language, runtime versions, install, script, and deploy
TSV Matrix Transposer & Normalizer
Transpose and normalize TSV or delimited matrices
UART Baud Rate Error & Timing Calculator
Calculate UART frame timing and baud divisor error
Unit Converter
Convert length, weight, volume, and area units (metric ↔ imperial) with live results
Unix Pipe Builder
Build Unix command pipelines by chaining commands together with visual feedback
Vector Similarity Calculator
Compare embedding vectors with cosine, Euclidean, and dot product metrics
Web Font Subsetter & Glyph Stripper
Analyze local font glyph usage and generate subset instructions.
Web Vitals Budget Simulator
Estimate LCP, INP, CLS, and Total Blocking Time from a deterministic browser resource budget.
Web Vitals Calculator
Rate your Core Web Vitals — LCP, INP, and CLS — against Google's official good, needs-improvement, and poor thresholds, with an overall assessment
WireGuard Config Generator
Generate WireGuard client and server configurations