[mpiedrav]

What about an app by some permanent federal election commission? Several countries have a Supreme Electoral Court, which is independent of political parties.

For instance, in Costa Rica (3.4 million voters) we just elected mayors nationwide and received trustworthy results within a couple of hours (reported using a party-independent app).

Caucuses are also run by the Supreme Electoral Court. Kind of an Election-as-a-service.

[Rebelgecko]

The party primaries are more or less independent from "real" elections. This is how the parties like it— the DNC argued in a lawsuit that they don't have any obligation to make the process fair.