This report summarizes the findings of an effort to develop and validate tablet-based, self-administered assessments of English-language foundational literacy and numeracy in the early grades. The tools described in the report were developed at the request of Imagine Worldwide with the support of the Jacobs Foundation. RTI carried out field testing and a pilot study to assess the tools' internal consistency, test-retest reliability, and concurrent validity with respect to "traditional" EGRA and EGMA. RTI International developed the two assessments, known respectively as the Self-Administered Early Grade Reading Assessment (SA-EGRA) and the Self-Administered Early Grade Mathematics Assessment (SA-EGMA), with the support and at the direction of Imagine Worldwide. The assessments are deemed “self-administered,” because children complete the assessments independently in response to instructions and stimuli imbedded in the tablet-based software. However, adults typically supervise the organization and conduct of the assessment as well as the collection of individual data from the tablets for analysis. The tools have been developed under an open-source license. The code can be viewed and downloaded for reuse or modification at https://github.com/ICTatRTI/SE-tools/blob/main/README.md. Users of RTI's Tangerine software may request that the SA-EGRA and SA-EGMA tools be added to their Tangerine groups via https://www.tangerinecentral.org/contact