What Programming Languages Does Apple Use?

Apple writes its apps and operating systems in Swift, Objective-C, C and C++. It uses Python, Java, Go and JavaScript for tools, back end services and the web. There is no single Apple language.

Swift is the one Apple created and the one it promotes. C and C++ still sit underneath, because the operating systems and drivers were built on them.

Here is where each language is used.

Language	Where Apple uses it
Swift	New apps and frameworks on iPhone, Mac, Watch and TV
Objective-C	Older frameworks and app code that still ships
C	Kernel, drivers and low level system code
C++	Compilers, media, graphics and performance critical parts
Python	Automation, testing, data work and machine learning tools
Java and Scala	Large back end services
Go	Newer services and internal infrastructure
JavaScript and TypeScript	Web pages and web based tools
Verilog and SystemVerilog	Design of Apple silicon chips

Swift and Objective-C

Swift is Apple's main language for software on its devices. It is safer than Objective-C because the compiler checks more of your code before it runs.

Objective-C has not gone away. Large parts of the frameworks were written in it, and Swift is designed to call that code directly.

For a new app you should learn Swift. For maintenance work on older code, reading Objective-C is still a useful skill.

Does Apple use Python?

Yes. Python runs test automation, build tools, data analysis and much of the machine learning work.

Apple job adverts for internal tools and for machine learning teams list Python regularly. It is rarely the language that ships inside a device.

Does Apple use Java?

Yes, on the server side. Apple job adverts for services teams list Java, Scala, Go and Python for back end work.

The rule is simple. Code that runs on the device tends to be Swift, Objective-C, C or C++. Code that runs in a data centre is more varied.

Which language should you use in an Apple interview?

You can usually pick your own language for a coding round. Choose the one you write fastest and know best.

Two exceptions are worth knowing. Platform and embedded teams often expect C or C++, and app teams often expect Swift.

Ask your recruiter before the technical round. That one question removes most of the guessing.

Why Apple built Swift

Objective-C was showing its age for new work. Its syntax was unusual and it allowed classes of memory faults that are easy to make.

Swift was Apple's answer. It keeps full access to the existing frameworks while catching more mistakes at compile time.

That history explains the mix you see today. New code is Swift, and the layers under it stay in C and C++ because rewriting them would gain little.

What Apple engineers work with beyond the language

Xcode is the main development tool for Apple platforms. It holds the editor, the debugger, the simulators and the interface builder.

Teams also use LLVM and Clang, the compiler projects Apple supports. Graphics work uses Metal, the low level graphics interface for Apple devices.

Silicon teams work in hardware description languages instead. Verilog and SystemVerilog are the ones named in chip design adverts.

How to Prepare

Pick one language and go deep. Interviewers care that you write it fluently, not that you know five. See which language is required to get a job at Apple.
Learn the wider stack. What tech stack is used at Apple? covers the tools around the code.
Drill the coding patterns. Grokking the Coding Interview teaches the patterns that Apple rounds use, in whichever language you choose.
Firm up data structures. Grokking Data Structures for Coding Interviews is the base that every Apple technical round assumes.
Check the question style. Read whether Apple asks LeetCode questions before you plan your practice.
Prepare the design round too. Apple system design interview questions shows what mid and senior candidates face.