▁mobile ▁pro tot yp ing ▁tool ▁to ▁support ▁full ▁feature ▁anim ations ▁of ▁user ▁interface ▁items ▁within ▁a ▁prototype ▁screen . ▁The ▁included ▁icon ▁gallery ▁contains ▁thousands ▁of ▁SV G ▁icons ▁for ▁use ▁as ▁buttons , ▁lists ▁and ▁tab ▁bars . ▁Pro to . io ▁V 3 ▁also ▁supports ▁web ▁fonts , ▁which ▁allows ▁the ▁user ▁to ▁access ▁all ▁available ▁online ▁fonts . ▁ ▁Version ▁ 4 ▁ ▁The ▁fourth ▁version ▁of ▁Pro to . io ▁was ▁launched ▁in ▁April ▁ 2 0 1 3 . ▁This ▁version ▁was ▁not ▁as ▁heavily ▁focused ▁on ▁introdu cing ▁new ▁individual ▁features , ▁but ▁rather ▁aim ed ▁to ▁improve ▁the ▁tool ’ s ▁user ▁interface ▁and ▁overall ▁efficiency ▁with ▁a ▁completely ▁rev amp ed ▁editor . ▁ ▁Version ▁ 5 ▁ ▁October ▁ 2 0 1 3 ▁brought ▁one ▁of ▁the ▁major ▁releases ▁of ▁Pro to . io . ▁With ▁Version ▁ 5 ▁users ▁gained ▁the ▁cap ability ▁to ▁build ▁HTML 5 ▁interactive ▁anim ations ▁more ▁intuit ively ▁with ▁the ▁new ▁An imation ▁States ▁& ▁Tim elines ▁feature . ▁This ▁release ▁introduced ▁a ▁wide ▁variety ▁of ▁other ▁new ▁functional ities ▁as ▁well , ▁such ▁as ▁easier ▁Drag ▁& ▁Rot ate , ▁Vari ables ▁and ▁Item ▁property ▁interactions ▁and ▁new ▁touch ▁events . ▁ ▁Version ▁ 6 ▁ ▁The ▁most ▁recent ▁release ▁of ▁Pro to . io ▁was ▁launched ▁in ▁July ▁ 2 0 1 6 . ▁The ▁entire ▁interface ▁was ▁red es igned , ▁making ▁the ▁most ▁used ▁tools ▁easily ▁accessible ▁to ▁users . ▁Additionally ,