As an Australian user of this app, I work with electron flow making some of the out come of my circuits a little confusing. Knowing that most components, such as diodes and transistors are visually in conventional flow in symbol form. To be able to switch to electron flow (negative to positive) could be a good addition to this app, making it easier for some or even experimental to observe the out come. So far the app is great and useful in my studies, thank you for developing this.