Elza Co develops software and hardware tools that are open source. We believe that a tool being inaccessible because of cost disproportionately hurts those with the greatest need. Accordingly, we publish all of our software for free on our site or github as well as the schematics and build files for hardware. We do sell hardware because it saves to buy PCBs and components in bulk, but in the end we pass the savings on to the consumer.