The text editor we are using for Text notes is called CKEditor and it's a commercial product. The core components are open-source, however they offer quite a few features that require a commercial license in order to be used.

We have reached out to the CKEditor team in order to obtain a license in order to have some of these extra features and they have agreed, based on a signed agreement.

Since v0.105.0, all premium features were replaced with plugins written specifically for for Trilium, from scratch and under an AGPL license.

The premium features used to be:

- Slash Commands
- Text Snippets
- Format Painter