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I'm designing a money management app, and I'm curious what does people react to the color red and green.

Incomes should be displayed green or red? And expenses?

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Just be aware that red/green colour-blindness is quite common, so perhaps you shouldn't rely exclusively on colour for differentiation. – CJ Franken Mar 2 '14 at 16:49
Alright, thanks for the heads up. – albusshin Mar 3 '14 at 8:39
up vote 3 down vote accepted

Common situation is that green/black numbers mean positive balance and red numbers mean deficit or negative balance.

So, I'd say that income should be green or black and expenses in red. Is what most people would be familiar with.

One example sheet

Another example, this time with graphs but still usual colors

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