With two significant changes:

It’s now totally free for everyone.

We’ve exposed our API.

It’s free in the hope of building a user base. The API uses secure OAuth authentication and makes every read/write method available to developers. The API documentation isn’t yet complete but there’s enough to get you started.

The entire front end has been redesigned, including shared notes and there’s a few nice new features in the back end like the ability to inline embed attached images.