Ngaphandle kwento yokuba iqela lobunjineli lika-Apple ligxile kuhlobo olulandelayo lwe-macOS, iSierra ePhakamileyo, abafana baseCupertino basasebenza kuhlobo lwangoku, uguqulelo oluya kuqhubeka nokufumana uhlaziyo olutsha kude kube kukhutshwa i-macOS 10.13. NgoLwesibini odlulileyo i-Apple isungule i-beta yesithathu ye-macOS 10.12.6, i-beta njengesiqhelo Okokuqala ifumaneka kuphela kubaphuhlisi. Kwiiyure ezingama-24 kamva, uApple ukhuphe i-beta yesithathu yenguqulo efanayo, iMacOS. 10.12.6, uhlaziyo olutsha olungasinikeli zindaba zibalulekileyo, kuba abafana baseCupertino bajolise ekuphuculeni uzinzo kunye nokhuseleko.
Kunye nokuqaliswa kwale beta entsha ye-macOS, iApple isungule i-beta kawonke-wonke ye-iOS 10.3.3, enye inkqubo yokusebenza ekwabandakanyiweyo kwinkqubo ye-Apple beta, apho namhlanje kungekho watchOS okanye i-tvOS, Nangona eyokugqibela iyakwenza njalo kungekudala njengoko kuchaziwe nguTim Cook kwi-WWDC yokugqibela ye-2017. Iinguqulelo ze-beta ezingasokuze zifikelele kubasebenzisi be-beta yoluntu yi-watchOS, kuba kude kube ngoku akunakwenzeka ukuthotywa ngqo kwi-Mac yethu, ukuba isixhobo sibonisa iingxaki zomsebenzi emva kofakelo.
Ukusukela nge-5 kaJuni ophelileyo, abasebenzisi abaninzi sele bevavanya i-beta yokuqala ye-MacOS ePhakamileyo yeSierra, i-beta eseluhlaza kakhulu, yiyo loo nto ifumaneka kuphela kubaphuhlisi kwaye kude kube sekupheleni koku akulindelwanga ukuba kuphehlelelwe kuluntu Inkqubo ye-beta. Le nguqulo intsha ye-macOS ayisizisi izinto ezininzi ezintle, kodwa kunoko I-Apple iphumeze inani elikhulu lokuphuculwa kokusebenza (APFS phakathi kwabanye), ukuze inkqubo yokusebenza ikhawuleze kwaye isebenze ngakumbi.