nos2x is described as 'Nostr signer extension' and is an app in the web browsers category. There are three alternatives to nos2x for Mozilla Firefox, Android, Google Chrome and F-Droid. The best nos2x alternative is Amber Nostr Event Signer, which is both free and Open Source. Other great apps like nos2x are nos2x-fox and Nostr Connect.
Amber is a nostr event signer for Android. It allows users to keep their nsec segregated in a single, dedicated app. The goal of Amber is to have your smartphone act as a NIP-46 signing device without any need for servers or additional hardware.
The Nostr Connect Chrome extension offers a secure way to sign Nostr events on web applications without exposing your private keys. Serving as a fork of the popular nos2x, it enhances user security and privacy by managing event signatures locally within the browser.
