I am not sure what your goal is but it sounds like you want to game the search engines and I think that is a waste of time. Sure it might work for a while but Google made 500+ algorithm updates in 2011.
If you have something that actually offers value to people then make it available/visible. Tell people about it, make it easy for them to bookmark and share, make connections in the world (even if just contacting site administrators and telling them who you are and what your site does). List your site in the Open Directory Project, etc.
Out of curiosity, I looked at www.brillout.com which led me to www.timer-tab.com. I can tell you that having your < h1 > set to display:none is a no-no (you have hidden text for the purpose of manipulating search engines...on both sites).
You also have the title set to a dynamic countdown so how can a search engine index that?...and what would it index you as?
I don't know if the mixing of microformat markup into the metatags would be problematic or not but I would look into it...
And then an iframe also set to 'display:none.'
Truth be told, I couldn't code a site this dynamic, maybe the things that are hidden are made visible under certain conditions but remember search engines often (more or less) crawl the static site and yours (if it is this app) is a bit thin.
As others have touched on, use the title and description tags judiciously and don't be deceptive, trying to show one thing to search engines and another to users.
I just came back to this question and had a couple more thoughts and feedback.
First, I think you made a slight error in the initial schema.org markup. Your html element currently says:
< ... itemscope itemtype="http://schema.org/CreativeWork/WebApp/Utility/Timer">
I thought it looked overly specific and what I think you meant is this:
< ... itemscope itemtype="http://schema.org/WebApplication">
Right now you are using fictitious microformat markup.
Instead of having this:
<h1 style='display:none'>Online Web App for Timer Countdown, Alarm Clock, and Stopwatch.</h1>
I think you'd do much better with something like this:
<title>Timer Tab | Online Web App for Timer Countdown, Alarm Clock, and Stopwatch.</title>
And for that matter I'd get cut down on 'stopwords' and maybe add something people are likely to search for, like 'free.'
<title>Timer Tab | Free Online Web App: Timer Countdown, Alarm Clock & Stopwatch</title>