Thumbtack, like any marketplace, has two sides: consumers looking for services and pros offering services. As a result, we have two iOS apps: one for consumers and one for pros. To manage dependencies in both apps we use CocoaPods, not only for 3rd party libraries but also for our internal library called TTKit.
There are two main reasons to migrate to frameworks: first and foremost, supporting Swift code in our dependencies; second, better code organization. With frameworks, each library is contained in its own module as opposed to having every static library compiled and linked into one binary.