What's the best Android app for building a free family tree with collaborative features?

FamilySearch Tree is a comprehensive Android application tailored for genealogy research, particularly for users seeking to build and maintain family trees without subscription fees. The app excels in offering a shared, collaborative tree system, which helps reduce duplicate entries and errors commonly found on other platforms. Key features include intuitive tree navigation, source attachment tools for verifying information, and task management that encourages users to contribute to global family history projects. For instance, individuals can spend hours sourcing documents or correcting data on the go, making it ideal for quick research sessions during commutes or dedicated study periods. Reviews indicate high user engagement, with many praising the free, ad-free experience and DNA integration through MyHeritage for discovering relatives. However, some users report occasional bugs, such as app crashes during edits, and recent updates have altered search functionality, requiring more detailed inputs that can frustrate quick lookups. Despite a slight learning curve due to its extensive features, the app's depth and community-driven approach make it a valuable tool for both novice and experienced genealogists.