Browser Notebook is new and leaks several features, that other applications offer. For example there is no option for automatic synchronization, not all browsers support the local mode, iOS support is limited...
The focus is on privacy and ease of use.
Unlike most other applications, you must not download or install anything and there is no registration and no login. You can just call the website and start using it. Of course, if you want to use Browser Notebook locally without Web access, you must download the files.
If you don't care about privacy, you can use Microsoft OneNote or Google Keep. There are many features and they are simple to use, but these are proprietary application, you can't verify what they are doing with your data and these companies are known to care little for privacy.
Evernotes is free to use and has many features, but it is - like OneNote and Google Keep closed source. Encryption is an option and the algorithms are now a bit better than in the past, where a broken algorithm (RC2) was used for encryption, but there is still no authenticated encryption that prevents tampering attacks.
Joplin is available for all major operating systems and can be synchronized between them. Joplin has the most features and the largest community of all the programs presented here. Encryption is an option, not a default setting. Joplin uses the same library for encryption as BrowserNotebook (sjcl), but without a memory-hard key derivation function.
Home: JoplinSimple Notes is now available for Linux, Windows, Mac, Android and iOS, you have to download and install and you need a registration to use. The content is encrypted, but at least they can read your data too. This is fine, if you forgot your password, but not suitable, if you care about your privacy.
Home: Simple NotesTurtle uses authenticated encryption based on the SJCL library (like Browser Notes) and a key derivation function with a high iteration count (100K), but unfortunately not a memory-hard key derivation function. You need to download and install the application.
Home: TurtleLaverna is the only application here, that can be used without any registration or installation - like Browser Notebook. Encryption is an option, that is disabled by default. Laverna uses authenticated encryption, but not a memory-hard key derivation function to protect against custom hardware attacks. It is very simple to use.
Home: Laverna