Announced 2011, October 04.
Released 2011, October 14
Build Glass front (Gorilla Glass), glass back, aluminum frame
Chipset Apple A5 (45 nm)
CPU Dual-core 1.0 GHz Cortex-A9
GPU PowerVR SGX543MP2

Announced 2013, September 10.
Released 2013, September 20
Build Glass front (Gorilla Glass), aluminum back, aluminum frame
Chipset Apple A7 (28 nm)
CPU Dual-core 1.3 GHz Cyclone (ARM v8-based)
GPU PowerVR G6430 (quad-core graphics)

Announced 2015, September 09.
Released 2015, September 25
Build Glass front (Gorilla Glass), aluminum back, aluminum frame
Chipset Apple A9 (14 nm)
CPU Dual-core 1.84 GHz Twister
GPU PowerVR GT7600 (six-core graphics)

Announced 2016, September 07.
Released 2016, September 16
Build Glass front (Gorilla Glass), aluminum back, aluminum frame
Chipset Apple A10 Fusion (16 nm)
CPU Quad-core 2.34 GHz (2x Hurricane + 2x Zephyr)
GPU PowerVR Series7XT Plus (six-core graphics)

Announced 2017, September 12
Build Glass front (Gorilla Glass), glass back (Gorilla Glass), aluminum frame
Chipset Apple A11 Bionic (10 nm)
CPU Hexa-core (2x Monsoon + 4x Mistral)
GPU Apple GPU (three-core graphics)
Qi wireless charging

Face ID
Announced 2017, September 12
Build Glass front (Gorilla Glass), glass back (Gorilla Glass), aluminum frame
Chipset Apple A11 Bionic (10 nm)
CPU Hexa-core (2x Monsoon + 4x Mistral)
GPU Apple GPU (three-core graphics)
Qi wireless charging

Face ID
Announced 2019, September 10
Ultra Wideband (UWB) support
Build Glass front (Gorilla Glass), glass back (Gorilla Glass), aluminum frame (7000 series)
Chipset Apple A13 Bionic (7 nm+)
CPU Hexa-core (2×2.65 GHz Lightning + 4×1.8 GHz Thunder)
GPU Apple GPU (4-core graphics)
Qi wireless charging

Face ID
Announced 2020, October 13
Build Glass front (Gorilla Glass), glass back (Gorilla Glass), aluminum frame
Chipset Apple A14 Bionic (5 nm)
Ultra Wideband (UWB) support
CPU Hexa-core (2×3.1 GHz Firestorm + 4×1.8 GHz Icestorm)
GPU Apple GPU (4-core graphics)
Qi wireless charging