Sign and Chisel are two free brushes for iPad lettering on the Procreate app. One has the blocky tip like a sign marker and the other is more like a chisel tip marker. Neither is pressure sensitive, so they also work well on older iPads that can’t use Apple Pencil. You can download the brush files below: Chisel brush here. Sign brush here.
I used the Sign Marker brush for this post in the It’s Always Sunny in Philadelphia lettering challenge.
