Hello! We are selling satellite (STEM CubeSat) kits: www.mysatkit.com Last year we sold about 40, this year will more then 100. All sales are saving in manually filled Google sheets. A lot of clints ask about same upgrade and new features. And we are trying to notify them when request changes are implemented. Please recommend me any CRM what will be useful for customer management but will not be to complicated. For now we decided to use the Hub spot and it's integration plugin with Woocomerce. Thank you in advance for any information and feedbacks!