In March 2021, Williams introduced the FW43B, designed to compete in the 2021 season. The car had its first shakedown in February 2021 at Silverstone with George Russell and Nicholas Latifi behind the wheel. Roy Nissany drove the car during the first two days of pre-season testing. He also drove the car during the first practice session of the 2021 Spanish Grand Prix. Originally, the car was to be introduced in a special AR mobile app where fans could see the car in their tables or garage, but prior to the launch, the app was hacked. Thus, Williams decided to cancel the app. The car's livery pays homage to Williams' successful past, and to Sir Frank Williams, who founded the team, but left it after the 2020 Italian Grand Prix. The FW43B is the first car to compete in a full season without the Williams family managing the team. The car made its debut in the Bahrain Grand Prix. At the Emilia Romagna Grand Prix, both Latifi and Russell retired, after contact with Nikita Mazepin and Valtteri Bottas respectively.