cryptgeon is described as 'Secure, open source note / file sharing service inspired by PrivNote written in rust & svelte' and is an app in the file sharing category. There are more than 10 alternatives to cryptgeon for a variety of platforms, including Web-based, SaaS, Android, Chrome OS and Android Tablet apps. The best cryptgeon alternative is vanish.so, which is both free and Open Source. Other great apps like cryptgeon are Retriever, One-Time Secret, Privnote and SafeNote.
If you need to send a password or some other form of simple but sensitive information to someone you can not send it over IM or email. These methods are not secure as anyone with little knowledge can intercept this information during transmission.
