Hi! I assume you're talking about PC, correct? I agree with /u/IGSketchUK - Krita is my favorite app for PC. I only know the basic alternatives like Krita and PaintTool Sai, but are there any others I should know about? Please and Thank You. Had I known it would come to this, I honestly would’ve saved the download to my Google drive! I do know that the paid download on the Microsoft Store is only $19.99, which is infinitesimally cheaper than other paid software, but I’m browsing free software until I come across some bank. I was absolutely devastated when I found this out considering it was the only free software I felt truly comfortable using as a beginner, then intermediate level artist. However, after being on hiatus for a good long while, I arrived late to the news that Autodesk has discontinued Sketchbook. My ability and technique as an artist has improved immeasurably through both Sketchbook’s desktop and mobile app, and I am extremely grateful for it. This was a game-changer for low-income artists like me who can’t afford to pay $30-$50 a month or even more just so they can practice their digital art. More importantly, Autodesk also released Sketchbook completely free at one point. It had such a simple yet powerful interface that allowed you to create professional illustrations and designs without the hassle of messing around with sliders and measurements in programs like Photoshop or Krita or ClipStudio Paint. I actually discovered it from PopCross Studio’s art YouTube channel. When I first found Sketchbook by Autodesk, I absolutely loved it.

Autodesk sketchbook app