A sandbox set of developer tools for debugging and exploration
Shows your IP address and all HTTP headers the server sees. Useful for debugging proxies, CDNs, and VPNs.
Parses a URL into parts: host, path, query parameters, and hash โ with percent-encoding decoding.
Encode and decode text in both directions. Standard or url-safe alphabet, Unicode-compatible.
Query A, AAAA, MX, TXT, CNAME, NS and more records for any domain.
Look up IP geolocation: country, region and city, plus coordinates and timezone when the database provides them.
Inspect a host's TLS certificate: verdict, days to expiry, issuer, SAN list, protocol, cipher and chain.
Paste a token, get header, payload, exp and iat in a readable form.
MD5, SHA-1, SHA-256, SHA-512 and bcrypt โ hash and verify passwords right in the browser.
Generate UUID v4 and v7 with one-click copy.
Displays your screen size, window dimensions, browser language, and device capabilities.
Convert HEX, RGB, HSL. Itten wheel with complementary & triadic harmony. WCAG contrast checker.
Live Markdown preview with HTML export.
Generate QR codes with custom colors, styles, gradients. Download PNG or SVG.
Translate cron expressions to plain text.
Compare two texts and see what changed.
Match a regex against text with flags and group highlighting.
Self-hosted agent orchestration platform โ install guide and downloads
Return any HTTP status, error rate, delay or provider-shaped body โ or drop and hang connections โ to test your error handling.
Full Markdown syntax reference with examples.
Preview the dark and light color schemes side by side.
Generate Claude Code and Codex agent configs: prompts, tools, model tiers and ZIP download.
Arttron DevTools: eight offline dev tools in your toolbar, plus optional DNS, TLS, IP and HTTP checks.
How to connect Claude, Cursor and other clients to the MCP server.
