When i design websites in Ps, i use Bootstrap grid system, so when i give the files to the developers, they know what width i used, how many columns, what classes to use etc. This feature will be really welcome, if you could include rulers (as in PS) so we can draw the grid, and save it for later use, or some similar option.

Thank you for creating XD, it's AWESOME!

I think for me, it's more of a desire for responsive grid guides than an actual ruler or even guide lines. I don't actually use the ruler myself either.

However, if the 'Responsive Artboard' feature:

https://adobexd.uservoice.com/forums/353007-adobe-xd-feature-requests/suggestions/12942171-responsive-artboards

is added, then the ruler's purpose might shift from being a design guide to becoming a media query breakpoint indicator.

Much like Chrome's breakpoint developer tool.

As long as I am able to set up a grid quickly and easily (like the GuideGuide extension or the way I can do it in Photoshop CC) i'm happy. I'd want the ability to switch these on and off so I can see a preview of my mocks without the interference of the lines.

I've currently set up 1px rectangles in XD as my workaround which i'll need to remove before sending artwork off.

I like having the rulers there as a guide but only use them if need an extra guideline I didn't set up in my initial grid.

The fundamental problem with rulers, guides, smart measurement is that they don’t always know the context of what you want to measure.
Rulers (ex Info Panel) often tell you the distance relative to the Top Left or Center. Smart Measurements (purple overlays) often miss the context of what you are trying to measure (see Fig 1).

I've put together a quick PDF document with screenshots demonstrating the UI. Hopefully it will make it clearer. I show the problem (with screen) and a possible solution (2 screens) utilizing both RULER and GUIDE. Please let me know if I can help further.

https://dl.dropboxusercontent.com/u/538933/GuidesRulersTK.pdf

I almost never use rulers in web design. In Photoshop, they serve mainly to allow me to drag guides onto the canvas. Being I'm usually designing responsive web sites, I almost invariably use something like the GuideGuide extension to set up guides: margins, columns, gutters, etc. A way to do this within XD would be a dream. A grid system is indispensable for modern design, and a way to set up columns that elements can snap to would be great. The ability to save multiple sets of columns would be great, too.

I can only speak for myself, but I like having an artboard-level ruler for the currently active artboard. I tend to run Illustrator with rulers and grids on and usually only turn them off if the extra data is getting in the way of what I'm trying to mock out.

My two cents on rulers is that they serve as a static frame of reference for the design I'm working on. Relative measurements between objects and guides are certainly useful and welcome, but the big benefit of having rulers visible is that I grounds everything else I'm looking at.

Personally, I prefer to have rulers attached to the window frame rather than floating next to the artboard. When rulers float above or to the sides of an element I get a bit lost. I lose the ability to compare something inside the rulers to something outside of them. Window-level rulers help me quickly size up one object relative to another, a group, or negative space.

I could probably live without a ruler attached to the window frame, but it would take some getting used to.

As for a smart grid system - of course, yes! But PS and AI way to do it is not enough. Should be something more intelligent and quick. Different types of columns, margins, etc. Closer to Indesign, but more updated for web, interactivity

@Tomáš Krcha: Guides have the greatest value to me at a desktop webdesign is when I marking the edges of website. 1000px width. I want to have all the blocks aligned directly under itself. See http://1200px.com/ This is important in rensponsive webesign. So I can break blocks better under itself.
Grid is good for rounded dimensions, which is nice for developers.
Guides must be attached to artboard.
Contextual clues enough, because you gotta move your mouse a lot of you to know that everything is in the right places.

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Největší hodnotu pro mě vodítka mají u desktopového webdesignu, když si označuji okraje webu. Šířka 1000px. Chci mít všechny bloky zarovnané přesně pod sebou. Důležitý to je u responzivní designu, kde to můžu snadněji podělit 2,3,4,6 a naskládat bloky pod sebe. Mřížka se hodi na desetinásobky rozměrů, aby to byla trochu hezká čísla.
Vodítka musí být navázaná na artboard. Kontextová vodítka nestačí, protože se musíš najezdit hodně myší, aby jsi věděl, že je vše na správných místech. Občas si s něčím hneš ani nevíš jak.

1) Definitely - YES,

But

2) I actually don't use rulers as rulers. I use them as a starting point for dragging custom guides. These guides I need!

3) As for rulers and metrics - in the ideal world I would love to have a layout of my design with all the distances between the elements for passing it to programmers, because preparing a doc with all this info is always a pain.

Guides and rulars like photoshop and illustrator

The "grid layout" in Photoshop is super handy in addition to the object distances. Another good example is the "Split object/path into grid" in illustrator for creating column grids for responsive sites.

As I was working in XD, I instinctively wanted to drag a snapping guide from the ruler to my canvas, just like the Photoshop environment. That ability would be useful when two artboards of the same layout are created but I have to go back in and adjust an object by a few pixels here and there.

It'd be awesome if XD had flexible grids (percentage-based within an artboard). I always have to draw these out in Illustrator, and it's even more difficult in Sketch.

Will you be able to integrate Foundation / Bootstrap in any way

Like the way grids are made in Adobe Comp

Baseline, columns, gutters, etc... Snapping too

Please please please!

This is a very important tool as well as the ability to setup a custom grid structure. It's also important to allow for guides as well as the ability to make these transparent so they don't obscure design elements.

In addition it would be great to see a set of pre-set guides / grid structures that can be loaded based upon best practices within the community for devices / and resolutions (IOS, Android) etc...

Another request for guides and grids :) Kind of a must-have...

Guide Guide is a great start, column and baseline great are a must! But would love the feature to have PADDING, please. Also, if we could have the grid as solid shapes with opacity controls for overlay, super nice to have.

Guides and rulers. +1