# Which is my identicon?

I’m confused about my identicon.

When I’m using iOS app, it’s a green one; however, on the website I get a blue purple one.....Could anyone tell me why? Thanks!

PS: I now can see I have that blue one in this MSE meta community.....even if I’m using my app.....

• I believe it is assigned by Gravatar ( en.gravatar.com ) using your information. Perhaps your email address. If you like, you can paste in a picture of your own, rather than using theirs. So somehow, your information when you first logged in on iOS was different from your information when you first logged in on your computer. – GEdgar Mar 28 '18 at 13:31
• @GEdgar Thanks! It helps me a lot! – Benny Mar 28 '18 at 13:34
• There's something weird with your math.SE account. If I look at your profile (math.stackexchange.com/users/517681/benny) you have a green icon but if I look at your posts, you have a blue icon. Across the rest of the network you have a blue icon, it's just this one place. – Brian Nickel Mar 28 '18 at 23:54
• @BrianNickel Thanks for your comment！I'm also confused about that. – Benny Mar 28 '18 at 23:57
• @BrianNickel And when I myself see my posts using app, I have the green icon; whereas using website, the blue one... – Benny Mar 29 '18 at 0:10

You were experiencing a bug that affects Gravatar/Identicon users who have capital letters in their email address. Because we request icons of various sizes, we build Gravatar requests on demand using various data including email addresses. The algorithm we're supposed to use is MD5(ToLower(email) + salt) but our code was missing the ToLower.