State and Local Digital Service Act of 2021 This bill directs the General Services Administration (GSA) to establish a Digital Service Agreement Program, under which GSA shall award grants to, or enter into cooperative agreements or memoranda of understanding with, eligible applicants (state, local, and eligible tribal governments) for the purpose of planning, establishing, or supporting a digital service team or supporting digital services collaboration to improve the delivery of government assistance through digital services. The GSA must (1) minimize the burden on eligible applicants in the development of proposals for a digital service agreement, including by providing technical assistance to applicants in the preparation of applications; (2) require semiannual progress reports from applicants awarded or entering into a digital service agreement; and (3) make publicly available a dashboard of service delivery metrics, performance measures, and progress.