Ask HN: What's your favorite OpenAPI authoring tool?

I've tried countless tools to author OpenAPI specifications but haven't found one that I really like.

What's your favorite tool to author OpenAPI specifications and why?

I use Zuplo for creating my OpenAPI spec - but mainly because it generates a full API gateway from it. The UI only supports some of the basic fields, but for anything complex I need to use their JSON editor.

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