We have a few apps in appexchange and with the new lightning UI, many users would probably start using the new lightning UI. In one Trialheads it says that your apps can apply lightning ready certification.
AppExchange Apps with Custom Objects, Visualforce Pages, and More
Many apps from the AppExchange feature customizations, including custom objects, custom buttons, Visualforce pages, and more. As part of the Lightning Experience rollout, partners are testing their apps in the new experience and applying for a Lightning Ready certification. Apps that are Lightning Ready will work in Lightning Experience and offer a more consistent user experience with other Lightning pages. If an app is supported in Lightning Experience, a "Lightning Ready" sash appears on its AppExchange listing. If an app isn’t supported in Lightning Experience, use it in Salesforce Classic instead.
Is there any documentation on the criteria for lightning ready certification. Any guidelines on how to make your app both classic ready and lightning Ready? Or can an app be only lightning ready or salesforce Classic ready
