So this question has been bothering me for a while now. Some people don't mind this, while others absolutely hate when icons don't have the same style. This is from my experience. What am I am talking about is thin and bold icons. In Material Icons offered here by Google: https://design.google.com/icons/ you can find various icons, what I was wondering if I should use all the same icons, EG: Only thin line icons or only bold icons? Or is using both icon styles allowed and not frowned upon?

1 Answer 1


Consistency is a useful thing. However, you are also constrained by it. The icon set you use put a upper constrain on the complexity of icons you can use. So if you feel that the icon set does not give you enough then you may need to redesign the icons to fit your need.

In reality theres very rarely the luxury to entirely design the icon set to be entirely uniform. So you quite often see interfaces with a mixture of icons form different sources and ages. You can see this everywhere, I currently have Illustrator open in the background and I can see Adobe suffering from this.

So if you can restrain yourself to a uniform set, please do. Not that even all sets are uniform in a generally accepted way. There might be people who disagree with you. What is more important than the uniformity of your icons, is the fact that you create a coherent message with those icons. So if theres 2 distinct functionalities that are like but not mixed it might well be within the rights to use totally separate iconography.

  • "So if theres 2 distinct functionalities that are like but not mixed it might well be within the rights to use totally separate iconography. " Thank you for this :D This is so right!
    – Slim C.
    Commented Dec 16, 2015 at 16:55
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    I disagree that it's a rare luxury to build a uniform icon set. It's usually a basic part of the branding and UI design. Regardless, even if that luxury isn't there, building off of an existing icon set following the same style shouldn't be viable.
    – DA01
    Commented Dec 16, 2015 at 17:13
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    @DA01 its not necessarily a luxury for you, your in the business of making icons (I also dont mind drawing 200 icons if somebody pays me to do it. More often than not the boss tells you to forget it). But icon sets live over age, so while it wast a big deal to make new icons when you had 10 to build it might already be a big deal when you have to modernize 400 icons. Adding icons to an existing set can be problematic, if the new icon has some wildly different needs. So say you have strictly 2 color icon set and you need a icon that needs to exemplify color... Not much you can do.
    – joojaa
    Commented Dec 16, 2015 at 17:40
  • @joojaa I'd worry about any UI that requires 400 icons. :)
    – DA01
    Commented Dec 16, 2015 at 17:41
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    @joojaa haha! Honestly, I do. I find photoshop to be a bloated mess of a UI. Which happens after 20 some years. But they are long overdue for a complete rethinking of the UI. (IMHO)
    – DA01
    Commented Dec 16, 2015 at 17:45

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