Ruby vs Swift
Ruby shows up at 6 of the 255 companies we track, Swift at 5. None have both.
Counts come from DNS, response headers, page source and public job posts; a tool named in a single job post is not counted. They show adoption among companies developers look up, not market share. There is no signed verdict for this pair yet.
Ruby
6
companies (2% of those tracked)
Only Ruby
6 companies
Usually paired with
Amazon Web Services (6), Stripe (5), React (4), Kubernetes (4), PostgreSQL (4)