This app was mentioned in 1 comment, with an average of 3.00 upvotes
Since you already use ArtScroll, why not the Artscroll digital library app? The app is, like it says, a digital library, so you can add whatever artscroll books you want in it and have them wherever, including their Wasserman siddur. It's really customizable and full of probably too many features, and has full English instructions and translations, which you can set to display in several ways. This is actually what I use most weekdays, and I also have some "daily dose of torah" books downloaded for reading whenever I have a bit of time when I'm not at home. All the books do cost money, though, so be aware of that (the weekday siddur is like $10, but iirc if you already have the "RustyBrick" siddur app, then you can get it for a very reduced price).
As for other recommendations: > Ice Cream Siddur is free and really pretty, but very lacking in the amount of English on it. However, it has a really nice feature of having push notifications of upcoming zmanim.
> Sefaria - do you have a pile of extra space in your phone? Want to download a few shelves of talmud, mishnah, commentaries, mussar, responsa, etc? Free and open source! They're trying to get basically the whole classical core of Jewish texts up on there, and you can have it all on your phone. Also, very pretty and minimalistic.