Every iOS release brings a new round of questions from clients: will our app still work, and what do we need to change? The honest answer is that most compatibility issues are avoidable with the right checks built into your development process from the start.
Start with device and OS coverage
Before writing a line of code, define which devices and iOS versions your app actually needs to support. Apple's adoption rates move quickly, but not every customer upgrades on day one — testing against the last two major versions covers the overwhelming majority of real-world usage.
Common compatibility pitfalls
- Deprecated APIs that still work today but are quietly scheduled for removal.
- Layout assumptions that break on newer screen sizes and safe-area insets.
- Permissions and privacy prompts that Apple's review process has become stricter about over time.
Treating iOS compatibility as an ongoing maintenance task, rather than a one-off release milestone, is what keeps an app running smoothly through every operating system update — and keeps it out of the App Store review queue for the wrong reasons.