The more eyes you get on your prototype, the better. With Sketch, you can easily share your prototypes with colleagues and clients — and add comments as you review it, from any web browser.
How to share prototypes
In the prototype’s Preview window, click the Share icon 
in the top-right corner. From there, you can copy a link to the prototype to your clipboard or share it using other apps installed on your Mac, such as AirDrop or email.
When sharing a link, first make sure your prototype is shareable by setting the link’s permissions to View in the document’s Settings.
From the sharing options you can toggle the check boxes to hide Hotspots and hints or the toolbar and navigation, which helps create a more client-friendly and distraction-free experience in your prototype.
Keep in mind that you can only share prototypes from Workspace documents.
How to share a prototype link from the Mac app
Click the Copy Link icon 
on the upper right. From here you can also toggle the check boxes to hide Hotspots and hints, and/or the toolbar and navigation, which helps create a more client-friendly and distraction-free experience in your prototype.
How to share a prototype link from the web app
You can also directly copy and share a prototype’s URL from the Preview window in your browser.
To share a prototype from the iPhone app tap the Share icon in the document’s title when viewing the document sheet.
Commenting on prototypes
Clients or colleagues can comment on your prototypes using only a web browser, which can be a handy way to collaboratively review your work.
To show comments in the Prototype Player, click the Comment icon 
on the upper right. The comments you’ll see here only apply to the currently visible frame.
To add new comments, click the 
or press N, drop your comment pin anywhere on the frame, and start typing.
When you share a prototype, everyone will see any existing comment threads.
When you comment on an Overlay, you’ll see the comment pin highlighted when you hover over it to show that you’re commenting on a different frame.
Once you’ve finished viewing or adding comments, click the Comment icon again to continue interacting with the prototype.
How to view and add comments in a shareable prototype
Frequently asked questions
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Why are prototypes taking longer to load in the browser?
Prototypes in the web app are rebuilt every time you save a change in a Workspace document. When you open a prototype in the web app, you may briefly see a “Rendering Prototype” message and a black screen while it loads.
Once a prototype has been built, you can usually reload it or open new tabs and keep using the same version — as long as you’re in the same browser session.
To see the latest changes after saving the document, close the prototype player (use the back button in the top-left) and then open the prototype again from the latest version of the document.
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I copied a prototype link into a new tab and it didn’t update. Why?
If you copy a prototype’s link from your browser’s address bar and paste it into a new tab in the same browser session, you may still see the same built prototype. Closing the player and opening the prototype again from the latest version of the document should update it.
