Omnisend Email Marketing & SMS

I use this app for my store at http://the-crystal-healing-shop.myshopify.com/ I think it is great. Its very easy use and it is a great tool for segmentation. The customer service is very good and very quick. I like the fact that free version offers you so many emails for free, the features for the free version is not that limited, like as they are with other similar apps.