Zapier makes connecting services together simple. For example, with Zapier integration your customer could complete a form on your website and their details be added to the Kashflow 'customers' section. Or it could enable synchronisation between popular CRM systems and Kashflow. Or marking systems. Or just about anything else.
Kashflow's integrations are few. Zapier would help ease this weakness. Zero has had it for ages, and has better integrations to start with!