Shopify Forms

Works like a charm... gets 5 stars from me... it's not as customisable as other paid apps, but this works perfectly for running competitions and the likes... you can create inline or pop-up forms that you can place on any page and apply a custom tag automatically for anyone that completes the form. Some folks are saying in the reviews it doesn't collect or store the data, but that's not true - I've tested it and the names are entered into my customer list and I receive an email each time someone completes the form. This is a good option if you are hoping to collect a lot of sign-ups since many of the paid apps cap you out at a certain number of active customers... Shopify does not.