In addition, the company has shown off its first voice-controlled smart screen for the home to feature a camera.
This allows it to offer more personalised features than a previous model, but also risks provoking a privacy backlash.
Other announcements at its annual developers conference included enhancements to its search tool.
The Pixel 3a and larger Pixel 3a XL will cost £399 and £469 respectively, making them roughly half the price of the seven-month-old Pixel 3 originals.