Yes You can use your shopify store like a prelaunchr site like harry's. In your shopify store there is one option for same, please follow below.
Go to shopify admin > Settings > Online Store > Storefront password
in online store you will find option for Storefront password, please enable to set a password for your store and thats it. now your store will work like a prelaunchr site for outer audience. They can share your store to social media like Fb, twitter, and G+. Every user has to fill his/her email to get notifications about your store. by this way you will be able to get number of email into your store database.
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