Browser Notebook is new and leaks several features, that other applications offer. For example currently only plain texts are supported, there is no option for automatic synchronization, not all browsers support the local mode, iOS support is limited...
The focus is initially on encryption security rather than features. Browser Notebook intends to provide a more robust privacy concept (texts are never stored unencrypted, use of authenticated encryption and memory-hard key derivation, making the source code available).
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, but no installation is required.
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 the weak RC2 algorithm was used for encryption, but there is still no authenticated encryption.
Simple Notes is only for Windows, Android and Linux open source (not for macOS), 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. I couldn't figure out the encryption algorithms at the first view on the source code.Home: Simple Notes
Turtle 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 function. You need to download and install the application.Home: Turtle
Laverna is the only application here, that can be used also without any registration and installation. Encryption is an option, that is disabled by default. Like Turtle it uses authenticated encryption, but also not a memory-hard key derivation function to protect against custom hardware attacks.Home: Laverna