The comparison for something as openly partisan on the left as Fox News, in US media, would be something like Democracy Now! or maybe The Nation.

The thing is, though, there are a few components here: there's level of favorability toward a certain kind of politics, which some barely-popular left-leaning outlets roughly match Fox News on, plus propensity to lie and exaggerate. And there's reach.

Nothing left-partisan in the US that I'm aware of touches Fox on either of those latter fronts—propensity to just make shit up, and (certainly not) reach.

Nobody's putting Democracy Now! on in waiting rooms. Hell IDK maybe at Planned Parenthood, never been, wouldn't know, but not at a dentist's office or at the auto shop or what have you.

There are equivalents to Fox News on the Left (Fox News viewers think it's MSNBC because that's what Fox News and AM radio told them, LMFAO, no) in the US, in terms of level of commitment to supporting partisan causes. There's nothing like it as far as willingness to deviate from reality to do so, nor in reach. Nothing remotely close.