In a move to boost its competitiveness in a crowded field of streaming music services, Rdio has just announced that anyone can stream any song in its library for free on the web.

“[S]tarting today Rdio is free in the U.S. on the web. That means you can listen to 20 million songs plus all the albums, playlists, and stations you love anywhere there’s a computer. Absolutely free,” says Rdio.

It’s important to note that this is only for web streaming. If you want free mobile streaming, you’re going to have to opt for Rdio Unlimited, the company’s paid option that gives you mobile on-demand streaming and is ad-free (it’ll run you $9.99). Rdio Free allows you to listen to music via mobile, but only stations.

Of course, with “free” streaming services come ads. Here’s how Rdio explains theirs:

“As part of this update, we’ve added in-stream messaging to Rdio on the web. These new ads are short and sweet. Free listeners will hear a mix of new feature announcements, messages from partner brands, notifications about exclusive content, and other helpful tips.”

Nothing you’re unfamiliar with.

The timing of this announcement seems deliberate when you know what rival Spotify recently unveiled. Yesterday, Spotify got rid of streaming time restrictions in all markets across all platforms, and just last month they decided to offer free mobile streaming for the first time ever.

Image via Rdio