VaultNote is described as 'Modern, privacy-focused tool for sharing sensitive data like passwords and API keys. Unlike traditional services, all encryption (AES-256) happens directly in the user's browser (Client-Side Encryption) before any data leaves the device' and is an app in the security & privacy category. There are more than 25 alternatives to VaultNote for a variety of platforms, including Web-based, Windows, Linux, Mac and Android apps. The best VaultNote alternative is Signal, which is both free and Open Source. Other great apps like VaultNote are Molly, FluffyChat, vanish.so and BurnChat.