Uizard is the easiest design tool you will probably ever encounter. It is made for people that don’t have a technical or design background.
If you can use Google Slides, Keynote, or PowerPoint, you can use Uizard!
Uizard is not a complex photo-editing software like Adobe Photoshop nor a vector illustration tool like Adobe Illustrator that requires months of training before you can create anything. The learning curve for Uizard is a lot lower than what’s required to master UI design tools such as Sketch, Figma, and Adobe XD.