Tags are the only vocabulary most APIs actually publish. They sit on the APIs.json collection, on each API within it, on the properties that describe it, and then again — usually written by a different team, years apart — on every OpenAPI document and on each individual operation inside it. Nobody ever sees all of them at once.
This tool walks the whole chain. Give it one APIs.json and it follows each entry to that provider's own APIs.json, follows those to every OpenAPI and AsyncAPI they index, and harvests every tag applied at every level — then shows you the result as a cloud, a graph of who shares which vocabulary, a provider × tag matrix, and a table. Click any tag to see the exact providers, APIs, and operations carrying it.
Two catalogs ship built in — API Management (the tooling used to manage APIs) and API Platform (the stack an API platform is built on) — both indexes of provider profiles in the API Evangelist GitHub organization. You can also point it at any APIs.json URL, or upload one — including the platform definitions produced by API Platform, whose inline merged OpenAPIs are read without a single extra request.
Everything runs in your browser. Nothing is uploaded. Bad files, dead links, and untagged definitions are reported in the work log rather than stopping the run — and every cap is stated, so a partial read never reads as a complete one.
Part of the API Commons tool suite.