The Autodesk Sketchbook app is free but is surprisingly packed with art tools that aren't blocked by paywalls. You can use the free version for seven days and then you'll be asked to make an Autodesk ID, which is also free. It's a little less intimidating than Procreate when you're starting off your digital art journey. When you download the sketch app, it'll give you a quick tutorial of where all the basic tools are. 

Autodesk has an extensive, well-organized brush library, and with its customizable brushes, it's easy to adjust settings like brush size, opacity and pressure. Even with a typical learning curve of a new drawing app, the toolbar is pretty easy to figure out. I also liked that, even when extensively zoomed in, the app didn't lose its "drawing" feel by letting you see the pixels in your stroke. 

One of my favorite parts of Sketchbook is the focus on making the transition from paper to screen easy. You might've done cool sketching in a notebook, and with Autodesk, you don't have to redraw the sketch in the app. Your camera doubles as a scanner so you can import your art. Images import with a transparent background so you can immediately get to work in the app.

Art Set 4 is one of the more basic, realistic drawing apps. It's free to download, but most of its tools are unlocked through the Premium Pro features, which cost $13. This app would be best if you're brand-new to digital illustration; it feels similar to having physical tools and paper in front of you. I love its user interface. If you're overwhelmed by the idea of going into a more complex app like Procreate or Autodesk, the Art Set 4 drawing tool is a good one to get started with. It's also fun if you just want to doodle. 

Something I really like about Art Set 4 is the ease with which even the free tools work together in a piece. It's also nice that you can swap between multicolored paper styles like canvas and the rough surface of heavyweight, cold press sheets for watercolor. You can choose burlap styles, cardboard and grids without messing up a drawing you've already done. 

When you explore the app, items that require Premium Pro will be locked. If you tap on a locked item, Art Set will ask if you want to upgrade and unlock everything. Premium gives you full access to over 200 brushes, 3D paint, fluid watercolor, the ability to layer and use masks, enable a "wet canvas," drawing guides like symmetry, shapes, filling and dozens of other ways to customize your workspace.

Not everything you create in an art app has to be a massive endeavor that ends with a masterpiece. Having fun is the most important part. Simply coloring can make for a creative and relaxing afternoon. Lake is a free ASMR art app packed with coloring book sheets -- in all different styles -- from artists all over the world.

The app's audio element is particularly cool. For example, if you do digital painting with the paintbrush, you'll hear quiet brush sounds. If you choose the spray paint tool, you'll hear a ball bearing rattling like it would if you shook a paint can. You can turn the ASMR off in settings. 

Another thing I liked was the option to stay in the lines and add more color for shading and effects. It gives you more room to be creative instead of just tapping and filling (although you can do that if you want). Also, the artist for each coloring page puts together an optional palette for you to use if you're not sure about colors.

You can stay on the app's dashboard and pick from free daily images or explore All Art in the toolbar. Lake sorts the coloring pages into artist collections, kids, abstract, animal, cities, feminist, portraits and mandalas for relaxation and satisfying symmetrical images. 

On Lake's free tier, you get nine free coloring pages per day. If you subscribe to premium -- $3 a week, $10 a month or $40 annually -- you'll get access to all the coloring pages, more color variations in the wheel and the option to use a blank canvas.