DataSynch OnPremise syncs data between Quickbooks and Salesforce, including accounts/customers, opportunities, orders, invoices, receipts, products, and payments. It uses a lightweight application installed on the Quickbooks computer for direct integration without middleware. The integration runs hourly but is configurable. Pricing is $900/year for 1-10 users or $1800/year for 11+ users, plus a one-time $495 set up fee.