What's the best iOS app for sermon preparation with extensive biblical commentaries?

Logos is a comprehensive iOS app tailored for in-depth Bible study and sermon preparation, offering a wide array of features that cater to both academic and pastoral needs. At its core, the app integrates a massive digital library of trusted theological works, including commentaries, lexicons, and study Bibles, which users can access on the go. A standout feature is the parallel viewing capability, allowing side-by-side comparison of Bible passages with accompanying commentaries or translations in split-screen mode. This is particularly useful for real-world scenarios like sermon drafting, where pastors can cross-reference interpretations or explore historical context without switching between multiple apps. Reviews indicate that users, from seminary students to seasoned preachers, appreciate the depth of resources available, with one noting it's their 'tool of choice' for academic and personal study. However, some limitations exist; the interface can feel overwhelming initially due to the sheer number of features, and while the free version offers solid functionality, access to premium resources requires purchases. Despite this, Logos excels in fostering thorough scriptural engagement, making it a reliable option for anyone seeking to build a personal theological library or enhance preaching with detailed analysis.