Did you try the Altbee interface? That works well on mobile. Created by the active user @zzq. Here’s a direct link to it, it’s fairly self explanatory to set up: https://altbee.aeonc.com. It’s a free, alternative front-end UI to Beeminder. Altbee doesn’t add any additional cost.
I create one Altbee “category” for each Beeminder tag, and then associate each Altbee category with its corresponding Beeminder tag. Then the altbee interface will show you the list of all your goals, untagged goals first, followed by goals associated with each tag. Here’s what the interface looks like on mobile after it’s set up.
So in this example, “Exercise” and “DailyRoom” are Beeminder tags and Altbee categories.
Finally, on Android, I create a homescreen icon to go straight to Altbee so it looks like an app. In chrome, go to https://altbee.aeonc.com, then select the vertical “…” menu, select “Add to Home screen”.