Charaster is described as 'Browser-based editor for ASCII grahics and art. It provides a robust set of raster-style editing tools such as Line, Rectangle and free-hand drawing tool; all configurable by specifying the character, color and styling to use while drawing' and is an app. There are more than 10 alternatives to Charaster for a variety of platforms, including Windows, Linux, Mac, Flathub and Web-based apps. The best Charaster alternative is Monodraw. It's not free, so if you're looking for a free alternative, you could try Playscii or Ascii Generator 2. Other great apps like Charaster are Letterpress ASCII, PabloDraw, MonoSketch and Calligraphy.