Launch day is the most important day in the life of your app. It is great to be able to drive downloads by sending out emails to hundreds of early adopters that signed up to be notified.For this you need a pre launch app landing page. If enough downloads happen on launch day, Apple might pick you up and feature you, or you might even break into a category top 25. That way you can create a hype around your mobile app.
A landing page is essential to help raise the profile and awareness of your app. It gives you a central place to direct users and collect their details before your app goes live. Having the details of hundreds (hopefully thousands) of potential users who are interested in downloading your app can really help boost your chart position on day one.