46 developer tools.
One keystroke away.
Every tool runs natively on your machine. Only the few that exist to go online, like DNS lookup or the API tester, ever touch the network, and they are labelled.
Format, validate, query and convert structured data.
jq Playground
Run jq programs or JSONPath queries against JSON and see results live.
Open →JSON Formatter
Format, validate and minify JSON with 2, 4 or 8 space indentation.
Open →Markdown Viewer
Edit Markdown and preview the rendered result live, with HTML export.
Open →YAML Converter
Convert between YAML and JSON with control over indentation and style.
Open →YAML Validator
Check YAML syntax and see the parsed structure as JSON.
Open →Lint containers and scaffold CI pipelines.
Dockerfile Validator
Lint a Dockerfile for syntax problems and common best-practice issues.
Open →GitHub Actions Generator
Build GitHub Actions workflow YAML from triggers, jobs and starter templates.
Open →GitLab CI Generator
Generate a .gitlab-ci.yml with stages, jobs and scripts from templates.
Open →Everyday helpers for diffs, patterns, schedules and identifiers.
Cron Generator
Parse, build and explain cron expressions with upcoming run times.
Open →Escape / Unescape
Escape and unescape HTML, JSON, backslash, shell and unicode strings.
Open →HTML Previewer
Write HTML and see it rendered live in a sandboxed preview.
Open →ID Generator
Generate UUID v1, v4, v7, ULID and NanoID in bulk, and decode timestamps.
Open →Number Base Converter
Convert hex, decimal, octal and binary with a clickable bit grid.
Open →Regex Tester
Test regular expressions with live match highlighting and capture groups.
Open →SemVer Calculator
Compare semantic versions, bump them and test them against ranges.
Open →Terminal
A quick scratch terminal with your default shell, inside the app.
Open →Text Diff
Side-by-side text diff with word-level highlights and a JSON mode.
Open →Call APIs, catch webhooks and inspect what goes over the wire.
cURL Generator
Build cURL commands from a form, or import an existing one.
Open →DNS Lookup
NetworkQuery DNS records with any resolver and run WHOIS lookups.
Open →IP Calculator
Calculate IPv4 subnets from CIDR, split networks and plan VLSM.
Open →REST API Tester
NetworkSend HTTP requests and inspect status, headers, body and timing.
Open →Social Preview
NetworkPreview how a URL unfurls on social platforms and audit its meta tags.
Open →URL Converter
Encode and decode URLs and query strings in either direction.
Open →UTM Link Builder
Build, validate and bulk-generate UTM campaign links.
Open →Webhook Generator
NetworkCreate sample webhook payloads and send them to any URL.
Open →Webhook Server
NetworkRun a local HTTP endpoint and inspect every request it receives.
Open →Convert, compress, resize and generate images in batch.
App Icon Generator
Turn one image into favicon, PWA, iOS, Android, macOS, Windows and Tauri icons.
Open →Code Screenshot
Turn code into syntax-highlighted PNG images for docs, slides and social posts.
Open →EXIF Inspector
View photo metadata, spot embedded GPS, and strip it before sharing.
Open →Image Compressor
Shrink PNG, JPEG and WebP files in batch with oxipng and mozjpeg.
Open →Image Converter
Convert PNG, JPEG, WebP and AVIF images in batch, offline.
Open →Image Resize & Crop
Batch resize images with social presets, or crop a single image visually.
Open →Palette Extractor
Extract dominant colors from an image as hex, CSS variables or Tailwind tokens.
Open →SVG Toolkit
Optimize SVG markup with SVGO and rasterize it to PNG at any size.
Open →Decode tokens, hash files and inspect certificates.
Base64 Converter
Encode and decode Base64 for text, files, URL-safe strings and images.
Open →Certificate Inspector
NetworkParse PEM certificates and inspect the TLS certificate chain of a host.
Open →Hash Generator
MD5, SHA, BLAKE3 and CRC32 hashes and HMAC for text and files.
Open →JWT Debugger
Decode, verify and re-sign JSON Web Tokens locally.
Open →Security Headers
NetworkFetch a URL and grade its HTTP security headers with fix suggestions.
Open →Colours, QR codes, time zones and a scratch notepad.
Color Picker
Pick a color and convert it between HEX, RGB, HSL and OKLCH.
Open →Lorem Generator
Generate themed placeholder text as paragraphs, sentences, words or lists.
Open →Notepad
A multi-tab scratchpad that keeps your notes between sessions.
Open →QR Code
Generate QR codes for text, URLs and WiFi, and decode them from images.
Open →String Generator
Generate random strings with custom length and character sets.
Open →Timestamp Converter
Convert Unix timestamps to readable dates and back.
Open →Timezone Converter
Convert a time to several timezones at once, with a live world clock.
Open →The same app runs your dev servers, terminals and AI coding agents per project, and tells you when an agent needs you.