Kotlin vs Swift
Kotlin shows up at 15 of the 255 companies we track, Swift at 5. 5 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.
Kotlin
15
companies (6% of those tracked)
Only Kotlin
10 companies, plus 5 with both
Usually paired with
Kubernetes (14), Amazon Web Services (12), React (11), PostgreSQL (11), Stripe (9)
Swift
5
companies (2% of those tracked)
Only Swift
0 companies, plus 5 with both
Usually paired with
Kubernetes (5), Docker (5), React (4), Amazon Web Services (4), PostgreSQL (4)