it’s very smooth and cool to use that kind of colors expetially for the UX, i don’t know how else to phrase, i hope someone can help.
The one I normally used to always use was
Adobe’s colour palette generator is good, and the mobile app (Adobe Capture CC) is great.
There are a load of others (Google “colour palette generator”), most have a way to generate standard combinations.
Adobe Illustrator has one built in