Remote signing is a great concept, but not many clients support it right now. If you want to play with remote signing, then this is the device I'm using:

LNbits Shop

Nsec Remote Nostr Signer - LNbits Shop

Secure Key Management for Nostr Protect your private keys while signing Nostr events remotely. The Nsec Remote Signer keeps your keys safely stored...

My daily driver, however is getalby.com which I use for desktops. I'm mostly iPhone, which has limited options, but this is the one most people use:

Nsec.app - Nostr Key Storage and Remote Signer