They are completely different. Tooltips are used in conjunction with a cursor hover interaction, and they are perpetual. A coach mark only shows up in the first render of a new UI element or feature, and once they are dismissed they are usually gone for good.
What is a Coachmark?
Noun. coachmark (plural coachmarks) (graphical user interface) A highlight or underline etc. indicating part of the user interface, to aid the user in learning how to use the system.
When should you not use tooltip?
1. Don't use tooltips for information that is vital to task completion. Users shouldn't need to find a tooltip in order to complete their task. Tooltips are best when they provide additional explanation for a form field unfamiliar to some users or reasoning for what may seem like an unusual request.
Are tooltips good design?
If it doesn't provide any new value, a tooltip only becomes annoying. On the other hand, good tooltip design can have a big influence on whether users understand the features and achieve success with your product. An effective tooltip is interesting, relevant, valuable, and helpful.
What means tooltip?
/ˈtuːl.tɪp/ a message with information that appears when you hold a cursor over a piece of text or an icon on a website or in a software program.