QuickBooks Online

App has freed up a lot of labour hours. Very responsive staff when you have technical problems as well. Marcks been a champ.

Works perfectly, OneSaas support are helpful. Only limitation that we found annoying was you can't set up a workflow where OneSaas tries to push an order from Shopify to your accounting system (Saasu in our case) as a Tax Invoice first, then if stock is not available (negative value) then it will push it through as a Sale Order. You can only choose either to sync all orders as Tax Invoices or Sale Orders. Then you either have to go into our accounting software and manually change all the orders into Tax Invoices or wait for pre-ordered stock to arrive before OneSaas will push the orders into Saasu as Tax Invoices. Would give 5/5 if this became a feature.