Yes. There is a mobile app for the constituent portal. The mobile app has all the same functionality as the desktop app, it is just optimized for mobile device viewing. Constituents can download the mobile app for Apple or Google via these links: 

There is also a mobile app for the portal available. Constituents can download the mobile app for Apple or Google via these links:

Apple iTunes - DonorView Portal App: https://apps.apple.com/us/app/donorview-portal/id6758018036 

Google Play - DonorView Portal App: https://play.google.com/store/apps/details?id=com.donorview.portalapp

Constituents will need your organization's portal URL or portal QR code to access your portal via the app. They will sign up as described in this article "How do I invite members to sign up for the portal?"