The challenge of securely logging into a nostr mobile app seems to be stifling innovation/usage for a number of powerful experiences. I've run into this repeatedly over the last couple of days. 

Who is actively working on solving this?

I know nostr:npub1l2vyh47mk2p0qlsku7hg0vn29faehy9hy34ygaclpn66ukqp3afqutajft has nsecbunker and nostr:npub1xdtducdnjerex88gkg2qk2atsdlqsyxqaag4h05jmcpyspqt30wscmntxy  has nsec.app. What else is out there ?