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The sucess of mobile apps is majorly depends on the marketing. Building an app is the tough part but you should market the mobile app in a better way to reach the audience. I found this article where it explains about the tips to market the mobile apps. Hope it will be helpful. Find more here.http://maria12.kinja.com/tips-for-marketing-your-mobile-apps-1262656120?rev=1378463722
One of the most easily overlooked aspect of marketing an app is being sure your app's icon is distinctive, attractive and conveys something about the app itself. Being certain it is well-written is critical as well. Otherwise, it won't take long before there is a lot of 1-2 star user feedback ratings, and if that happens, you are done for.
A website that does a good job of explaining the app and showing it "in action" would also be a good idea. It gives you a platform to show off what you've developed and directly tell the world how awesome it is and what needs it fills. Use SEO to make sure that your website gets the attention it deserves from the various search engines. A link in your signature line, if it doesn't violate the terms of the forums you visit, can help drive traffic to your website, especially if you have posts that aren't directly self-serving, i.e. "Hey, check out my fantastic app" when the topic is unrelated. Spamming is not the road to success.