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ABRSM's app for strings, helping you practice string exam pieces with backing tracks whilst changing the speed to suit where you're up to. Available for Android and iOS.
Details of violin app (from Grades 1 - 7):
https://gb.abrsm.org/en/exam-support/apps-and-practice-tools/violin-practice-partner/
And cello app (Grades 1 - 5):
https://gb.abrsm.org/en/exam-support/apps-and-practice-tools/cello-practice-partner/