Spectre is described as '(prev. Master Password) is a password manager which uses it's own, original algotithm: Instead of saving and sending passwords across the internet, Spectre calculates the password you need, only when you need it, then throws it away again' and is a popular password manager in the security & privacy category. There are more than 100 alternatives to Spectre for a variety of platforms, including Windows, Mac, Android, iPhone and Linux apps. The best Spectre alternative is Bitwarden, which is both free and Open Source. Other great apps like Spectre are KeePassXC, KeePass, Proton Pass and LastPass.