Following Salesforce's release of Lightning Experience back in 2014, Vicasso has been continuously working on redesigning the applications to act as first-class citizens in Lightning.

Following Salesforce's announcement in Spring '19 that they would no longer be adding new features or functionality for Salesforce Classic, Vicasso, along with many AppExchange vendors, adopted a Lightning-first approach to development.

Vicasso's applications are not only supported in Lightning, but are now designed specifically for use inside of Lightning. We continue to be able to provide support for functionality previously offered inside of Salesforce Classic, however, all new improvements and features are being developed for Lightning Experience only.

More information on what features are supported for Lightning vs. Classic can be found inside of our documentation.

At this time, Salesforce has not made a formal announcement for sunsetting the Classic experience. That said, organizations who haven't yet made the switch to Lightning should actively prepare for that transition.