Hreflang reciprocity is a classic international-SEO foot-gun. URL A declares URL B, but URL B forgets to declare URL A - Google silently ignores both. This tool takes 2-15 URLs, fetches each, and renders the cluster as an SVG graph with green = reciprocal, red = broken edge.
Read the story behind this tool: Why I built this - hreflang reciprocity is invisible without a graph.
Related: Hreflang Audit / Hreflang Generator / International Signal Parity