iOS is the proprietary operating system that runs on Apple's iPhone. It is closely related to macOS and is released in major versions each year, with updates delivered by Apple to all supported devices.
Why it matters
Because Apple controls updates, a large share of iPhones move to a new iOS version quickly, which changes browser behavior and supported web features. Safari on iOS has its own rendering engine rules, so a site that works in Chrome may still need testing on an iPhone.
Apps are sandboxed from each other and installed through Apple's review process in most regions.
Example
A page uses a feature that Safari on iOS 15 does not support. Visitors on that version see a broken layout while desktop users see none. Checking the user agent in your analytics reveals the version split, and testing in the iOS Simulator reproduces the problem.
Common mistakes
- Assuming Chrome on iPhone uses its own engine; on iOS most browsers rely on Apple's WebKit.
- Skipping real-device testing and trusting only desktop browser emulation.
- Staying on an old iOS version after support ends.
Related
Get notified when this term updates
Plus occasional practical tips on uptime and monitoring, nothing else. Unsubscribe anytime.
यह पेज सामान्य जानकारी है, जिसे हमारी संपादकीय टीम ने लिखा है और दस्तावेज़ीकरण बदलने पर अपडेट किया जाता है। सर्वर और प्रदाता अलग-अलग होते हैं, इसलिए बदलाव पहले सुरक्षित तरीके से जाँचें। देखें: संपादकीय नीति और अस्वीकरण.