While Share focuses on utilities and tweaks, ServiceNow Store is designed to offer more fully featured applications and integrations. This results in the following differences:
ServiceNow only accepts applications that have been checked and verified to ensure they meet guidelines to protect the security and performance of the instance.
While many applications are free, a significant proportion are paid for. They can typically be trialed before purchase. ServiceNow handles the billing.
The application creators are responsible for supporting the application.
You can visit ServiceNow Store at https://store.servicenow.com/. Once purchased, applications appear in the list at System Applications > Applications, under the Downloads tab.
Only partners registered for the Technology Partner Program can list applications on the store.