Check the key difference between iPhone 15 and iPhone 14 smartphone.

iPhone 15 has a 6.1" Super Retina XDR OLED display and 2000 nits peak brightness.

iPhone 14 has a 6.1" Super Retina XDR OLED display and 1200 nits peak brightness.

iPhone 15 Powered by Apple A16 Bionic processor with Apple GPU (5-core graphics)

iPhone 14 Powered by Apple A15 Bionic (5 nm) processor with Apple GPU (5-core graphics)

iPhone 15 has a dual camera setup of a 48MP primary main camera and a 12MP ultrawide camera with a 12MP selfie camera.

iPhone 14 has a dual camera setup of a 12MP primary main camera and a 12MP ultrawide camera with a 12MP selfie camera.

iPhone 15 houses 3349mAh battery and wired charging, 15w wireless and 4.5w reverse wired charging.

iPhone 14 houses 3279mAh battery and wired charging and 15w wireless 

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Want to know more about the iPhone 15 vs iPhone 14 Specs then do check the below link.