Some radios like the Elecraft KX 3 or the Icom IC-7300 are actually SDRs. So you don't need to connect all SDRs to a computer.
But SDRs like RTL-SDR, AirSpy, HackRF etc are meant to be controlled from a computer.
Do you need special software on a computer to access the SDR? Or are they all web-based these days?
There are hundreds of SDRs available. Maybe thousands if we count home brew. So no, any factoid claiming to be valid for "all" of them is likely to be wrong. The variety is enormous.
I'd personally say that the minority is web based, most prominent maybe the KiwiSDR and the WebSDR from University in Twente.
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