I don't think they have anything for Android or iOS. You can filter for evgo stations with plugshare, though. No billing or energy monitoring like with chargepoint's app.
I was thinking of the same. The only ones with apps I can find are: blinks, charge point, semaconnect, greenlots. No evgo.
Between Plugshare to find the charging stations, and the Tesla iPhone app to monitor charging, what else would you want an eVgo app to do?