Screenshot Machine - Screenshot machine is an online website capturing service. Creates a screenshot or thumbnail of any online web page in couple of seconds for free.
Storyly - Bring superb stories to your app
URL2PNG - Screenshots as a Service. Capture snapshots of any website, right in your app, quickly and reliably.
InAppStory - Engage your customers with Stories right from your app or mobile web product with InAppStory.
ApiFlash - ApiFlash is a powerful serverless screenshot API built with Chromium and AWS Lambda. It can easily scale to millions of screenshots per day and has an ever growing number of satisfied big clients.
Zuck.js - JavaScript library that lets you add Stories everywhere