iOS is Apple’s mobile operating system, introduced with the first iPhone in 2007 and known for tight integration between Apple’s hardware and software.1
Overview
iOS runs only on Apple’s own devices, atop Apple Silicon SoCs descended from the Arm architecture. Apps are written in Swift or Objective-C and distributed through a curated App Store, with a strong sandbox and hardware-backed security (Secure Enclave, code signing). The same foundation underpins iPadOS and watchOS. Because Apple controls both silicon and software, it can tune power and performance closely — a “walled garden” that trades openness for consistency.
Where it fits
iOS and Android together define the modern smartphone landscape. iOS leans toward control and polish; Android toward openness and variety. iOS’s locked-down model and lack of general USB host support make it a poor host for an SDR decode pipeline like GopherTrunk — it is far better suited as a thin client viewing data served by a capture node elsewhere.