Is there any danger of these other apps compromising your private keys?
Hey new Nostr users that have jumped on Nostr thanks to nostr:npub1xr7t5h0l25ej73pm04zgz9afeexyzsjx67s5v0xxf2sshjn4sx6sep2gqh, I'd like to take a moment and blow your mind and show you the power of Nostr. You're probably using Damus or Primal right now. I want you to go and download an app called nostr:npub1yfg0d955c2jrj2080ew7pa4xrtj7x7s7umt28wh0zurwmxgpyj9shwv6vg or nostr:npub1v5ufyh4lkeslgxxcclg8f0hzazhaw7rsrhvfquxzm2fk64c72hps45n0v5 . You can get either of these on the Google Play Store and Apple App Store. They're essentially Spotify but for Nostr. Once you have either one downloaded, you're going to want to "sign in" to this app with your private key or secret key from your Damus or your Primal. This is the long ugly looking string of characters that starts with NSEC. This is like your super secret password that you can never change, so you do want to keep it save and never share it. This key unlocks your identity. Now that you're signed into these apps, you can now comment on songs, boost them, share them, etc. and you'll see that activity in your Damus or Primal. Why? Because it's the same ecosystem and all of these apps work together. How fucking cool is that?
Discussion
It's always possible 🤷 there are services that exist to help safeguard your private key like Amber.
FYI I say it's possible, but they are themselves trusted applications and devs.
Possible the same way it's possible for Amazon to get hacked and compromise your credit card.
i wouldn't go and stick my private key into any and all applications. some are more trusted than others. if you use Android, i would recommend using an application called Amber. it's a private key manager. it holds your key for you so that you don't have to give it to applications. sadly nothing like this exists on iOS. if you use a laptop or desktop, you can use a lot of nostr apps on the web and use a web browser extension to hold your private key and sign into apps that way. it's more secure than entering your key. check out https://nostrapps.com to see what else is offered. i use an extension called Nostr Connect.
I started looking into building a native iOS signer on Nostr today. I have some ideas.
Derek isnt NOSTORE the one for iOS? 
correct!
I highly recommend always using a burner when testing new apps.
It makes no sense that we don’t have proper key management and delegation at the protocol level and built into the apps we use here every day.
Many keys will be lost and compromised as a result.
Correct 💯