My iPhone case gets hot when charging wirelessly

As I'm sure you already know, the way wireless charging works is through electromagnetic induction, and any metal in the charging path can disrupt the field and create resistance, which turns into heat. That’s why the ring in your case is getting noticeably hot—it’s essentially absorbing some of the charging energy instead of letting it pass cleanly to the phone’s battery. The phone itself is probably managing heat fine, but the case is acting like a little heat sink.

AFAIK, Apple’s own MagSafe cases are designed with this in mind. They use magnets rather than exposed metal rings and are tuned to minimize interference with the charging coil. They still get warm during charging, but usually not to the point where the ring feels “too hot to touch.” The difference is mostly in material choice and how the magnetic components are shielded. If you want to stick with a third-party case, look for one with a non-metallic MagSafe ring (often plastic with embedded magnets) instead of exposed or structural metal—it will run much cooler during wireless charging.