I started using Unisender when our small company needed new marketing strategies. We implemented email marketing and therefore needed a decent and affordable tool. Unisender was it. It has a low price and lots of useful features such as over a 100+ free templates that can also be customized. Also, there is sms and viber marketing available as well. All the designs are responsive and interactive. My team and I find Unisender one of the best tool we've used at our job.