The Obamacare websites that allow customers to buy tax-subsidized insurance have markedly improved since they opened four years ago, according to a report released Tuesday by the National Partnership for Women and Families.

According to the report, assembled with consulting firm Avalere Health, the exchanges provided better transparency in 2017 than in previous years and a better consumer experience, including by providing tools that allow shoppers to better sort through the plans. The report examined the federal exchange that 39 states use, called healthcare.gov, as well as 11 state exchanges and another from the District of Columbia, and compares them to analyses released in 2015 and 2016.