I had created a SPA for doing this using javascript in browser itself. Anyone can use it directly from browser. This is actually a part of an angular app I made sometime back.<p>It has watchers for an HN thread, a reddit post or comment and it can even watch multiple reddit inboxes if you run a small python script locally.<p>Here [1], just enter the thread id to watch for any replies under that thread<p>[1] <a href="http:&#x2F;&#x2F;z-petal.com&#x2F;ceasium&#x2F;#&#x2F;hackerNews" rel="nofollow">http:&#x2F;&#x2F;z-petal.com&#x2F;ceasium&#x2F;#&#x2F;hackerNews</a><p>[2] <a href="http:&#x2F;&#x2F;z-petal.com&#x2F;ng-ceasium&#x2F;ceasium-html5-angularjs-app-for-freelancers.html" rel="nofollow">http:&#x2F;&#x2F;z-petal.com&#x2F;ng-ceasium&#x2F;ceasium-html5-angularjs-app-fo...</a>