It is just Android. If you're familiar with the usual Material styling of Android, you're familiar with what Graphene looks like.
replyIf they'd put a screenshot, that would then have been immediately clear to casual visitors.
replyMy initial assumption was "this is gonna look like a typical OSS product, and not as polished as iOS or Android". A single screenshot would have dispelled that notion.
It looks about the same as stock android.
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