Apple’s official answer to whether iPhone 17 Pro cases are compatible with the iPhone 18 Pro is no, John Gruber reports: Apple says the camera plateau on the iPhone 18 Pro models is slightly thicker. Gruber gave the difference as one‑tenth of a millimeter — 11.5mm versus 11.4mm.
Do iPhone 17 Pro cases fit iPhone 18 Pro?
In practice, most cases appear interchangeable. In his personal testing, Gruber said his iPhone 17 Pro cases fit the iPhone 18 Pro models perfectly, and iPhone 18 Pro cases fit iPhone 17 Pro models. That implies both generations of Apple‑branded cases should work across the two models, and many third‑party cases are likely to be compatible as well.
There may still be isolated third‑party cases that do not fit, but according to the report this is expected to be the exception rather than the rule.
