All categories
Web & API Tools
Developer-ready browser utilities for APIs, headers, formats, CSS, and release checks. Choose from 9 focused tools below.
Content Security Policy Builder
Build a readable Content-Security-Policy header from selected directives.
Subresource Integrity Hash Generator
Create a SHA-256 integrity hash for pasted asset text.
HTTP Header Diff
Compare two copied HTTP header blocks and surface differences.
OpenAPI Diff
Compare two OpenAPI JSON documents before releasing an API change.
SQL EXPLAIN Visualizer
Make pasted SQL EXPLAIN output easier to scan and share.
dotenv to GitHub Actions Converter
Convert environment variable lines into GitHub Actions-safe syntax.
cURL to Fetch Converter
Turn a simple copied cURL command into a browser fetch outline.
JSON Pointer Playground
Validate JSON input and explore paths with a JSON Pointer.
CSS Specificity Calculator
Calculate selector specificity and explain why a CSS rule wins.