Anyone thinking about GrapheneOS asks the same thing first: will my banking app work? Most of the time it will, about 9 in 10 by the project's own count. On October 23, 2026 the GrapheneOS project posted that roughly 10% of banking apps refuse to run because they block any OS Google hasn't approved, and that a growing number, around a dozen so far, now explicitly allow GrapheneOS alongside the approved ones.

A dozen is small, but it matters more than it looks. The banks in that group that verify GrapheneOS with hardware attestation show the check blocking you was never about security.

I'll go through why Play Integrity rejects GrapheneOS, which banks I could actually confirm allow it, and what to set up if your bank isn't on the list.

Why Play Integrity says no to GrapheneOS

Most banking apps that block GrapheneOS do it through Google's Play Integrity API.…