If you have a Sortly consumer account (Free or Plus), you can share your account with customers by exporting and sending across a PDF or by giving them your Sortly username and password (not recommended).
If you are using Sortly for business we recommend you sign up for Sortly Pro. It is built specifically for business to keep track of their inventory. In Sortly Pro you can track inventory by customer account and also provide your customers controlled access (read only or edit access) to their inventory. To learn more about how you can use Sortly Pro for customers click here.