Libby, by OverDrive 4+

This app is brilliant for its main purpose, borrowing and reading library books, but also all the supporting features are pretty solid too. You can add cards at multiple libraries and manage the loans and holds across all seamlessly.
There is a history and timeline of the various books you have borrowed, placed on hold and returned which is already proving useful. Whilst reading a book, you can highlight passages or look up the meaning of words and phrases. The definition uses the Oxford Dictionary as well as ‘topic’ results from Duck Duck Go which are amazing succinct summaries with related topics also being surfaced. Links to extend to google, Wikipedia etc are also provided. After finishing a book (and during actually) you can view the timeline of your reading ‘journey’ of a book, and downloading this gives you a super cool web page summary of all the salient details including all the passages you highlighted - awesome (csv also available).
Extra things I would love: history of all definition look ups, a la kindle; intelligent rules for look up e.g. if I select one word automatically show the definition - if I select multiple words automatically highlight in the last colour, clicking on the highlight remains the same if you meant a one word highlight or to check a multi word definition; search across all libraries I have registered.
All in all a fabulous app, credit to the development team for creating something so usable.

I’m a huge reader but don’t have space to keep my own books and with a disability these days I really couldn’t get to a library often enough to get books back in time. Since finding this App it’s re-opened a whole universe of reading that I’ve not been able to do since leaving school and having to work. I can read any time, anywhere without having to carry extra stuff like a kindle plus no more worries about late fines! Lol! That’s the best bit! Even my kid is starting to understand why his Mommy loves reading as I’ve been reading one of my fav kids books to him (unbeknownst to me he had the ebook open and was reading along until he corrected me LOL). All I can say is, get more books from around the world (I’m American in the UK and would love to see my favourite American authors as well as the amazing British authors I can find now), for example there really aren’t many of Stephen King books from his recent works and I really miss reading Piers Anthony books for his fantasy stuff, also I wish I could read the audio books instead of not seeing the pages or having a different reading pace as the reader, there should be the option to read instead of listening as I often read when I need to be quiet or to calm me. I’m sure this will happen in time though because I really think this is the future for my fellow bookworms!