Inspectors tools
29 developer tools for inspectors. Every tool runs offline — your data never leaves your machine.
RegExp Tester
Test a regular expression against a string, inspect matches and groups
Text Diff Checker
Compare two texts by characters, words or lines
JSON Diff
Structural comparison of two JSON documents — key order and formatting ignored
Certificate Decoder (X.509)
Decode a PEM certificate — subject, issuer, validity, SANs, fingerprints
QR Code Reader
Read a QR code from a dropped or pasted image
XML Validator
Validate XML well-formedness with line numbers; check elements against an XSD
Color Contrast Checker (WCAG)
Check text/background contrast against WCAG AA and AAA
Color Blindness Simulator
Simulate how a color appears with protanopia, deuteranopia and tritanopia
String Inspector
Inspect length, words, lines, bytes and unicode code points
LLM Token Counter
Count GPT tokens for prompts, with per-token breakdown
Cron Job Parser
Explain a cron expression and list its next run times
CIDR / Subnet Calculator
Expand an IPv4 CIDR block: network, broadcast, mask, host range
Line Sort/Dedupe
Sort, deduplicate, reverse and trim lines of text
Line Filter (grep)
Filter lines by plain text, keywords or a regex — like grep, but visual
List Comparer
Set operations on two lists — intersection, union, differences
Data / IOC Extractor
Pull emails, URLs, IPs, domains, hashes, UUIDs and MACs out of any text
User-Agent Parser
Break a user-agent string into browser, engine, OS, device and CPU
HTTP Status Codes
Look up HTTP status codes by number or search by name/description
MIME Type Lookup
Look up MIME types by file extension, or extensions by MIME type
Password Strength
Estimate password entropy, weaknesses and crack time
Semver Range Tester
Parse semver versions and test them against range expressions (npm/cargo/go syntax)
K8s / Compose Validator
Validate Kubernetes manifests and docker-compose files — check required fields, containers, and structure
HTTP Header Analyzer
Parse HTTP headers, explain their purpose, and flag missing security headers
HTTP Request Analyzer
Parse raw HTTP requests or cURL commands — breakdown method, URL, headers, body, and generate code snippets
Hexdump Viewer
Display text, hex, or base64 data as a classic hexdump with offset, hex bytes, and ASCII
Protobuf / ASN.1 Decoder
Decode protobuf wire format (without schema) or parse ASN.1 DER/BER TLV structure
REST / GraphQL Client
Parse HTTP requests or cURL commands — breakdown, code snippets (fetch, httpie), GraphQL detection
DNS Record Explainer
Parse and explain DNS zone file records — A, AAAA, CNAME, MX, TXT, SRV, NS, SOA, CAA, PTR with security checks
Git Diff Parser
Parse unified git diff output — file list, additions/deletions, hunk breakdown, stats, structured JSON