Here’s what people had to say about Paintable brushes:
We’ve created the brushes for Photoshop, Procreate & Clip Studio Paint:
The brushes are compatible with any software that supports Photoshop (.abr) brushes, such as Affinity Designer, Adobe Fresco, or Artrage.
Of course you don’t “need” any special brushes for digital painting – the standard soft/round brushes are great for almost any occasion.
However, these brushes will save you a lot of time with sketching and shading!
I’ve recorded a video tutorial on how to use them so you can get started right away – they’re included with the download as well.