Our subscription plans currently have no limitations on the number of developers using the same API key for conversion. However, Swiftify does have a limit on the amount of code being converted, and this will be shared among all users using the same API key.
Refer to this article to check out how much code you can convert for each subscription plan.
Offline converter licenses are on a per-seat basis. Contact us to inquire about pricing based on the number of developers.