Just a word of caution here. Comic aggregate apps and programs have come under fire, scrutiny and even Cease and Desist Orders because they often pull content from the creators site without registering traffic or affording the reader the ability (and I use the term loosely since few like ads but we all know they are necessary to make this business viable) to visit the sponsors of each individual site. In many ways aggregate sites like that are seen as "stealing" from the creators since they trade reader convenience for creator revenue.
As much as we all wish making comics was it's own reward; ad revenue is a VITAL part of the "free" content business model and while aggregates are often a cool idea in my experience they don't last long because once you wake one of the sleeping giants (one of the high traffic comics) and they notice a loss of traffic due to an aggregate they shut it down fast.
It's a shame no one has found a way to make an aggregate program that serves up many comics whilst maintaining the much needed ad exposure, traffic and exposure to creator specific merch that going to the actual website affords. But until it does I would hesitate to join up with any aggregate website for fear of being seen as "part of the problem."
It's great for exposure for many of us smaller fish... but think about how happy you will be if you're getting thousands of views through an aggregate but no one is visiting your site, buying your merch or even commenting on your comics.
rlamb2 has made an interesting program and I applaud the effort but from what I've seen of it in the samples on the page it looks like it simply rips the art from the comics website and mitigates nothing of the traffic, ad or merch loss that it causes.
You say you have been looking for an app or web page like this and couldn't find it? There have been several before you. They have all been shut down for the reasons I listed above.
Now... if you weren't aware of this then no bigs. I understand the desire to read all your favorites in one spot. The Webcomics List is the closest I've seen to doing it right as they let you create your own custom "list" of your favorites and tells you when they are updated but you still have to go to the individual comic site.
However, if you were aware that this sort of thing causes revenue loss for creators and did it anyway then shame on you. It may seem ok to take something given for free on the internet but your basically stealing from someone who is already giving away their content for free. The only strings attached being a visit to their site and exposure to their sponsors. If indeed you are doing that then its pretty low of you.
Ad blocker programs and SEO manipulation already make it hard enough to make a buck in this game. If comics can't make any money they will simply go away and you will be left with the people who only do it as a hobby or for fun. And I don't think anyone wants that.
I encourage you to either remove your program/app or alter it so it takes into account the aforementioned circumstances. But at the very least I caution any of my members here to tread lightly if you ever consider getting involved in anything like this.
