ABTS scavenging activity showed that various leaves extracts gave varieties in results. Ethanolic extract of sample GD, GL and AR (GD3, GL3 and AR3) were very strong antioxidant, while AP3 was medium antioxidant. Ethyl acetate extract GD2, GL2 and AP2 were strong antioxidant, while AR2 was medium antioxidant. Potency of sample AR3 (ethanolic leaves extract of arumanis mangoe) using ABTS assays (34.20 ppm) which was around a half of potency antioxidant of trolox® (17.50 ppm). The previous study by Kawpoomhae [5] revealed that IC50 of DPPH scavenging activity of water extract of mangoe leaves was lower than its methanol extract, while IC50 of ABTS scavenging activity of methanol extract of mangoe leaves was lower than its water extract.