For devices stuck on (like the iPad 2, iPad 3, or iPad mini 1), finding compatible apps requires using the "Last Compatible Version"
No, for daily driving: You cannot use modern banking, ride-sharing, food delivery, or social media apps. Web browsing is slow, and certificates are expiring. ios 9.3.5 compatible apps list
Spotify: Older versions can still be installed if you have previously "purchased" or downloaded the app on your Apple ID. For devices stuck on (like the iPad 2,
Polaris Office: A solid choice for viewing and basic editing of Word, Excel, and PowerPoint files. or iPad mini 1)