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I'm wondering why in most mobile chats the message I write has a color background and white text (example: blue background and white text, like facebook) and the response is on grey background with black text.

The bubble with blue background and white text stand out more than the response which is what the user is going to read.

I leave an example of what I'm talking about.

Screenshot of chat with coloured text and backgrounds

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With respect to contrast on the White background of the application, the Gray background offers low visibility. However, in order for your texts to be legible, the contrast is bumped up again with a Black textColor.

In order for you to text, you need to type the text in the message box and then hit send. So you already know what's present in the text. Hence, it offers you a gray background which doesn't catch the eye so often juxtaposed to the Blue background which is a new text sent by someone else.

This is simply colored differently for the fact that the texts that are incoming to you are more important than the ones you have sent after typing them out.

For the same reason, few messengers also happen to tone down the color of the incoming texts which you have already read and keep the newer texts in a brighter tone.

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For me, the bubbles are only to make it look attractive and noticeable. Use any color that matches with your app theme, just make sure that its not causing readability problems to the user.

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Since the responder's messages are aligned to the left, I would argue that they are more likley to draw the eye of those who read left to right. I think selecting a primary color and a shade of grey for the background colors is probably done to maximize the visual contrast between the groups of messages. But there is also a balance to this. The sender's messages are aligned more prominently but have a less prominent background color while the converse is true for the responder's messages. The responder's messages are aligned less prominently but have a more prominent background color.

The font color is probably arbitrary since the popular WhatsApp Android app uses black font for both sets of messages.

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There is no solid reason. Hangouts is the only one with a logical approach on this topic, using grey background for your messages vs white background for the response so the messages you need to read have more visual weight than your own messages, which you'll need to read very rarely.

enter image description here

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    How is Hangout's color combination any more logical than any other combination? – Evil Closet Monkey Aug 26 '16 at 22:14
  • Hangouts uses white color for the responses and grey color for your own messages, so the messages you're intended to read have more visual weight than your own messages, which you're already supposed to know its content. – Marc Sep 21 '16 at 17:09
  • Doesn't the iMessage example in the op show blue responses which have more weight than gray? – Joshua Lowry Sep 23 '16 at 5:14
  • Yes, that's what the initial question is about: why the bubble with blue background and white text stand out more than the response which is what the user is going to read?. What I tried to explain is that this pattern makes no sense to me beyond brand issues. Also that you can see other companies like Google giving more contrast to the answer message as you can see in the image above. – Marc Dec 14 '16 at 12:53

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