Insomnia`, `Paw`, and `Postman` are three top API clients compared in terms of their features, user interface, performance, pricing, and platforms. Insomnia offers an easy-to-use solution with a free tier, Paw is a full-featured HTTP client for Mac users, and Postman is a collaboration platform that simplifies each step of building an API and streamlines collaboration. The winner of the comparison in terms of UX and performance is `Paw`, while `Postman` takes the testing category. `Postman` also has the most diverse platforms, including browser support. In terms of pricing, `Insomnia` offers a free tier with a lower team rate per user compared to `Paw`. However, `Paw` provides a better team cost for users who can use macOS for development.