accessibility – What term best describes focus on a low barrier to entry for an application?

I am building an application that I would like to describe as being accessible in the sense of having a very low barrier to entry. By this I mean it’s an online tool that you can start using immediately by going to the website, without having to sign up or navigate through a landing page full of promotion for it. You can just get started.

I’ve heard the term “accessible” used for this kind of thing, however I feel like accessibility is so thoroughly tied to its traditional sense of helping those with disabilities / impairments. So I’m not so sure it’s a good idea to use this term.

Besides having “a low barrier to entry”, is there another term that best describes what I am trying to communicate?