Concepts is a vector-based app, which means it does not have traditional blur or smudge tools like those in pixel-based apps. Every stroke remains editable, and redrawing them in real-time with blur effects is not yet feasible on current mobile hardware.

However, you can achieve similar blending and softening effects with these techniques:

Using the Soft Mask

The Soft Mask tool allows you to gently reduce the opacity of strokes on the same layer, which can blend colors together. Use it at a large size for a more diffused, airbrushed look.

Using the Airbrush

The Airbrush is a soft-edged brush. By drawing with it at a low opacity, you can layer colors and create smooth, realistic gradients.

Using the Watercolor Brush

The vector Watercolor brush is designed to live-blend with other watercolor strokes on the same layer. This creates a wet, bleeding effect perfect for organic blending.