Apple S-Series
2015 - present

Apple S1
March 2015

Apple S1P
September 2016

Apple S2
September 2016

Apple S3
September 2017

Apple S4
September 2018

Apple S5
September 2017

Apple S6
September 2020

Apple S7
September 2021

Apple S8
September 2022

Apple S9
September 2023

Apple S10
September 2024