Framework7 and Onsen UI are both popular frameworks for building mobile apps. Framework7 has gained significant popularity due to its rich features and wide range of available components. Onsen UI, although less well-known, has a dedicated community and is also widely used.
Framework7 provides a lot of customization options, allowing developers to create highly customized and unique app designs. It has an extensive theming system and supports CSS variables for easy customization. Onsen UI also offers a good level of customization, but it is more focused on providing pre-designed themes and styles rather than extensive customization capabilities.
Both Framework7 and Onsen UI provide good developer experiences. Framework7 has extensive documentation, a large community, and active development, making it easy to find support and resources. Onsen UI also has a solid documentation base and a supportive community, but it may have fewer resources available compared to Framework7.
Both Framework7 and Onsen UI offer good performance for mobile app development. However, since Framework7 is specifically built for creating native-like user interfaces, it may have a slight advantage in terms of performance optimization and rendering speed.