2,098 votes116 comments · Adobe XD: Feature Requests » 01 : Design mode · Flag idea as inappropriate… · Admin →
If you want rulers so you can create guides for snapping, please upvote: https://adobexd.uservoice.com/forums/353007/suggestions/14160453-guides
If you want rulers for a different purpose, please upvote this request and leave a comment telling us more about your use case.
It's utterly insane that this is unincluded feature needs to be upvoted in order for it to be implemented. The only thing crazier is how many years this deficiency has been called out with no action being taken.