Are Zoopla and Rightmove really your only options for finding home sales in the UK?

I'm baffled that the UK doesn't have an equivalent to the American MLS, or a site like zillow or redfin. What baffles me even more is that Zoopla and Rightmove give you no fields to filter on hardly? I've been doing some searches across a wide area (trying to explore options in different towns and cities), and fuck there are thousands of listings to sort through. It's overwhelming.