Various sources on the Web affirm that iPhone X and iPhone XS are near identical in dimensions and cases for iPhone X should fit iPhone XS.
However, there are also various reports pointing out specific cutouts applicable to certain cases.
Like, if the camera opening on the iPhone XS is noticeably larger, so if you have a case with a very tight fighting camera opening, your iPhone XS may not fit. One point outs that the placement of microphone vent is slightly different between the two phones.
The various reviews are shared below for reference:
- From the Q&A on Apple Online store:
Yes! They have same dimensions and buttons location. So all your cases from iPhone X will perfectly fit iPhone XS.
- Reddit thread, from /r/iphone, PSA: iPhone X Cases Will NOT Fit XS
Just noticed this in MKBHD's review: https://youtu.be/YAF9BWpzwvI?t=2m7s
The camera opening is noticeably larger. If you're upgrading from an X to XS, you'll need new cases.
- iMore, Will your old case fit the new iPhone XR, iPhone XS, and iPhone XS Max?
The iPhone XS is a refresh of last year's iPhone X, and appears to have the exact same design and dimensions. This means that you should be able to use your old iPhone X case with your iPhone XS. So all those great cases already available for the iPhone X are ripe for the picking!
That being said, the microphone layout on the bottom of the iPhone XS is slightly different than the iPhone X, which means cases that have precise cutouts for those microphone holes in the iPhone X, may be slightly misaligned on an iPhone XS.
- iPhone Hacks, Will iPhone X Cases Fit the iPhone XS?
The answer is a resounding yes! The iPhone XS shares the same dimensions as the iPhone X and since all port locations are also the same, iPhone X cases will fit the iPhone XS just fine. The latter is 3gms heavier than the iPhone X but this difference is unlikely to create any issues for cases with a kickstand or a slim profile.
- CNET, Will my iPhone XS fit in a iPhone X case? Yes!
The two iPhones have the exact same height, width and depth.
- MacRumors, iPhone X Cases May Have Slightly Imperfect Fit on iPhone XS Due to New Camera Bump Dimensions
While the iPhone X and iPhone XS have identical overall dimensions, a new report suggests that iPhone X cases may have a slightly imperfect fit on the iPhone XS due to very slight changes to the camera bump dimensions.
Note: The official case design guidelines for devices from Apple are made available here. The linked Accessory Design Guidelines containing precise measurements should soon get updated to include iPhone XS. If interested, you can go through the measurements to get a better idea of what aspects have changed between iPhone X and iPhone XS, and case analyze case compatibility.