Why does my card change different colors from yellow to purple is there any significance?

The colors represent broad spending categories. Reds is health, orange is food and drink, purple is services, etc. You'll see your Apple Card colors change too -- and a card with no balance displays white.

Hi,

As far as I understand, there are different colors for every type of purchase.

You can check this link, maybe it would help you :)

https://www.bustle.com/p/why-does-the-apple-card-change-colors-heres-what-each-color-means-18669982

but in summary :

• Green — Travel 
• Blue — Transportation 
• Orange — Food & Drink 
• Pink — Entertainment 
• Purple — Services 
• Yellow — Shopping 
• Red — Health

:)