Swissquote Bank is in the process of adding official support for GrapheneOS to their main app. They've published a Beta version of the app with GrapheneOS support for us to share with our users. Can use https://appdistribution.firebase.google.com/testerapps/1:922102381011:android:b7cac4eab8e5776d/releases/4rp8ha7plvg00 to obtain it via the sandboxed Play Store.

Swissquote previously added GrapheneOS support to their Yuh financial app. They're following our guide on using hardware attestation as an alternative to Play Integrity able to support more than Google Mobile Services hardware and operating systems: https://grapheneos.org/articles/attestation-compatibility-guide.

The link we provided might not work in Vanadium since Firebase appears to use the Client Hints headers to detect the OS version. We set the OS version in the Client Hints headers to the frozen User Agent value which is Android 10. May need to install and use Chrome to access it.

We've previously seen an issue where a site used the Client Hints provided OS version to ban using incredibly out-of-date Android versions. We didn't remove the Client Hints headers because that trips bot detection. Reusing the frozen User Agent values was working quite well.