Phonon Framework is described as 'Phonon is a front-end framework made with mobile and desktop in mind. It offers clear and neutral components that integrate best practices and ideas coming from well-known design styles' and is an app in the Development category. There are more than 50 alternatives to Phonon Framework for a variety of platforms, including Online / Web-based, Self-Hosted solutions, Mac, Windows and Linux. The best alternative is Bootstrap, which is both free and Open Source. Other great apps like Phonon Framework are Bulma (Free, Open Source), React Native (Free, Open Source), Materialize (Free, Open Source) and UIkit (Free, Open Source).