An important part of the Affordable Care Act was the creation of health insurance marketplaces, including a federal one (healthcare.gov), to sell insurance to individuals who otherwise don't have access. Individual states are permitted to create their own markets, or take part in the federal marketplace.
All marketplace plans cover Essential Health Benefits, which mean most types of standard care and coverage are part of any plan you purchase on the marketplace. You may see advertisements about plans that are "off-market, which indicates a plan that you buy directly from an insurance carrier or through a licensed broker, outside of an official state or federal ACA Marketplace. This doesn't necessarily mean the plans are bad, but it does mean they are not required to cover these Essential Health Benefits. Because of this, you should make sure to do your research to find out what an off-market plan you’re interested in offers. . If the premium seems too good to be true, it may be that you're sacrificing coverage you might need.
Catch offers all of the plans that are available on the federal marketplace. When you look for health coverage through Catch, the plans and prices you see are all those that are available on healthcare.gov.