So here are the main apps they use and a quick description.
superimpose-
10/10
it costs money but is 100% worth the money. I use it for every single cover I make and even though it's kind of confusing at first, once you've figured it out it's easy.
font candy
5/10
I never really use it and it doesn't have very many fonts. I can't rly remember why I downloaded it tbh but some people rly like it so...
wattpad covers
----
I never use it for anything other than getting the exact cover size as it has no particularly helpful uses like superimpose and phonto.
bazaart
7/10
I used to use this for cutting out pictures but now I mainly use it for nice background textures.
picsart
9/10
I don't use it as often anymore but it has lots of great filters and textures and is great for blending and editing.
phonto
10/10
Amazing app for fonts. You can download thousands of fonts that can add so much to a cover and you can do so much with the text. + It's free!
magic hour
9/10
This app has thousands of filters to download and my only problem is that with me is that it's quite hard to use and I don't really like the layout.
afterlight
8/10
Also filters + costs money (I think) but although it's really good, I'm not sure it's quite worth the money so be careful- it's still really good though
snapseed
9/10
Again, filters and in my opinion it's really good, especially the drama filters and I often use it to fix my failed covers.
polarr
9.5/10
Amazing filters and editing and it's just generally amazing so I highly recommend it.
—jenny