Whatever you think of Xamarin, there is a special place in hell for all the buggy JS based mobile software. Its not an improvement, just a different flavour of crap.
> Moreover, since this is a serious app from a security point of view it really should go full vendor native IMO.
hmm
On iOS I pretty much stick with Castamatic and Overcast, both are full native iOS apps but neither are open source. I'm sure there's something listed at http://www.NewPodcastApps.com which is iOS and full Xcode native.
UPDATE: 21 Open source apps written in Swift (including one I use every day: Firefox for iOS): https://medium.mybridge.co/21-amazing-open-source-ios-apps-w...
[1] popular OpenStreetMap client, https://github.com/osmandapp/
[2] popular messaging app among privacy advocates, https://github.com/signalapp
I will freely admit I am strongly biased against Xamarin as there are so few cases where I think it's unequivocally the right choice, and Bitwarden isn't one of them. It would make more sense to take the work done in their desktop electron app and use that as part of an Ionic hybrid mobile app than to screw around with the layercake of bugs and mismatched APIs that Xamarin is. Moreover, since this is a serious app from a security point of view it really should go full vendor native IMO.