The Table
Everyone on the same Wi-Fi, one app. The DM opens the table, players join with its code on their phones, and checks the DM calls for pop up on the right player's screen.
Open a table and your players join it from their phones on the same Wi-Fi. Then call for checks: they pop up on the chosen player's screen, they roll, and you see whether they made the DC.
Next Game Day
My Players
Open the Table and have your players join with its code: their heroes show up here, live.