Ekadashi Planner for Iskon Vaishnava is a very good utility tool for checking the dates of comming Ekadashi based on the information from Gaudiya Vaishnava. It tells the name of Ekadashi with the date followed by the paran time. Ekadashi planner is under beta stages and more improvements will be done soon.
Team Ekadashi Planner,
With Family Sharing set up, up to six family members can use this app.