According to a report from a few days ago, it seems that some developers realized that their apps weren’t taking full advantage of the iPhone 13’s 120Hz refresh rate. This led to speculation that Apple had hobbled the feature to help preserve battery life, but as it turns out, that isn’t the case.
In a support document posted on its website, Apple states that all apps can take advantage of the 120Hz refresh rate in the iPhone 13, and that they will just need to opt-in. This is versus the iPad Pro in which apps don’t need to be updated to make use of the 120Hz display, but presumably this might be due to the iPad Pro’s larger battery.
The document also highlights what developers can expect from the 120Hz display, which has a dynamic refresh rate meaning that it isn’t always fixed at 120Hz and that this isn’t something developers can force, so they should be aware of it when they’re testing their apps.
Apple has also since confirmed that there is a bug affecting some animations that rely on Core Animation and that a fix is on its way. In the meantime, there’s nothing that end-users can do except wait and hope that the developers of their favorite apps will update their apps to take advantage of the new display’s refresh rates.