MockupUI is another one, but its layouts don't look like drawn ones. They look like real things and with real data. It allows you to draw wireframes, as well as your own widgets that inherit their appearance from your OS configuration (for example, the visual style of Windows).
About layouts with high accuracy: the risk that the client believes that it has already been completed is minimal while you make your layouts at the design stage of your project (which is before the start of the code). On the contrary, the sketch may be too abstract for the client to digest if he is not a software developer. Sketches are for developers, not customers.
Frames (or sketches) and layouts are not the same thing, and they have different uses. One of them is to explain the functionality, the other is an idea of how the product will look. Check out Yisela's message about the difference between wireframes and layouts .
Your question was about software for screenshots of layouts, but you have finished buying a fairly powerful framework software.
Eugen fernea
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