At the moment you can play with it for a while for free, and then you need to register to use it. The free version is ad-supported, but the ads are visual only, so that's not too bad. There is a paid version that can be used without ads, and that can even be linked to other devices than your web browser, like your home stereo.
You can also put a create station box like the one below for people to try it out themselves, have a go!
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