Accumula builds software for ambitious brick-and-mortar retailers. Their flagship app, Mortar, connects Lightspeed R-Series, Lightspeed X-Series (Vend), and Heartland Retail to Shopify — syncing inventory, orders, products, and customers in real time across physical stores and online. Founded in 2013, Accumula is expanding its app suite to cover more of what independent and multi-location retailers need, including inventory management and clienteling.