Shortages of at-home tests and long lines at test sites led White House to offer free test kits by mail.

The Biden administration on Tuesday quietly launched its website for Americans to request free at-home Covid-19 tests, a day before the site was scheduled to officially go online.

The White House press secretary, Jen Psaki, said the website was in “beta testing” and operating at a “limited capacity” ahead of its official launch.

Officials emphasized that the federal website is just one way for people to procure tests, and shortages of at-home test kits have shown signs of easing as more supply has hit the market.