Apple’s Quiet Shift to Rust: What It Means for Developers
Apple is quietly reshaping the foundation of iOS — not with a press release, but with job listings, engineering breadcrumbs, and silent commits. While the UI layer still lives in Swift and Objective-C, a new systems language is working its way into the stack: Rust.
Over the past few years, tech giants like Microsoft (Windows kernel modules), Google (Android and Chrome), and AWS (Firecracker microVMs) have embraced Rust to eliminate memory-related vulnerabilities. Apple is now joining the movement.
Why Apple is Using Rust
Apple’s decision to invest in Rust comes down to four major drivers:
- Security and Reliability: Rust’s memory safety guarantees eliminate common bugs like null pointer dereferences, buffer overflows, and race conditions. That means fewer crashes and stronger protection against exploits — especially in the low-level layers where Swift’s safety features start to fade when interfacing with C or Objective-C APIs.
- Performance: Rust offers low-level control comparable to C and C++ without the same risks. This makes it ideal for infrastructure-level software like drivers, daemons, or kernel modules — areas where performance and precision are critical.
- Code Modernization: While Swift transformed app development, it’s not designed for systems programming. Under the hood, Apple platforms still rely on legacy C and Objective-C codebases. Rust is being used to gradually replace that aging foundation with safer, more maintainable components — particularly in backend and platform-level services.
- Developer Productivity: With Rust’s strict compile-time checks and memory model, engineers spend less time chasing down hard-to-reproduce bugs. That means more time building — and less time debugging EXC_BAD_ACCESS.
Where Apple Is Adopting Rust
This isn’t a wholesale rewrite of iOS in Rust. Instead, Apple is picking its battles strategically:
- Server-Side Platforms: Apple’s Cloud Traffic Team is migrating established C code to Rust and building new functionality in it for Linux-based systems.
- Device-Level Software: Rust is reportedly being used in GPU driver development for Apple Silicon chips — a testament to its efficiency at the hardware level.
- Low-Level Kernel Interfaces: Apple has hired engineers to apply Rust to Linux kernel interface work, aiming to make these critical areas safer and more maintainable.
What We Know Apple Is Doing (and What We Don’t)
Evidence in job postings & public mentions
- In 2020, Apple advertised a software engineer role describing how the “Cloud Traffic Team” was migrating an established codebase from C to Rust, and building new functionality primarily in Rust. (Phoronix)
- Some internal teams (e.g., cloud infrastructure, server backend) appear to be experimenting or adopting Rust in limited scopes. (Reddit thread)
- Community observers and job listings suggest Apple is moving low-level Linux kernel/system interfaces toward Rust. (Hacker News)
Speculations & rumors
- Some developers suggest that Apple is starting to use Rust for low-level programming more broadly. (DevTalk)
- Others argue that parts of iOS may be gradually reimplemented (or refactored) using a Rust-inspired or custom safe language.
- There’s speculation that Apple wants complete control over its toolchain, potentially distilling ideas from Rust rather than fully adopting it.
The Rust-Inspired Future of iOS
While Swift has modernized the app and UI layer, the lower layers of iOS still run on a fragile base of C and Objective-C. That’s why dreaded messages like unexpectedly found nil while unwrapping an Optional still persist in 2025.
By borrowing memory safety and concurrency ideas from Rust — such as its borrow checker — Apple can evolve Swift and iOS into safer, more performant platforms.
- WWDC security updates have emphasized memory safety.
- Job postings now mention Rust experience for systems-level programming.
- Apple may not adopt Rust wholesale, but the language’s principles are influencing their thinking.
This is classic Apple: borrow the best ideas, simplify them, and ship them at scale.
Rust vs. Swift: Complementary, Not Competing
Rather than replacing Swift, Rust fills a very different niche at Apple:
- Swift: Focused on application-level development across iOS, macOS, and other platforms. It’s tailored for building modern, expressive, and safe UIs and logic.
- Rust: Used behind the scenes — in servers, kernels, and drivers — where performance and safety matter most. It tackles parts of the system where Swift is not designed to operate.
Expect Swift to evolve, taking cues from Rust where it makes sense.
A Simple Code Comparison
Let’s compare a basic example of safe memory management in C vs Rust:
C Example:
char *create_message() {
char *msg = malloc(100);
strcpy(msg, "Hello from C");
return msg; // Don’t forget to free it later!
}Rust Equivalent:
fn create_message() -> String {
let msg = String::from("Hello from Rust");
msg // Memory is automatically cleaned up when it goes out of scope
}In Rust, there’s no need for malloc or free. Ownership and borrowing rules ensure safety at compile time. No leaks. No crashes.
What to Watch Next
If you’re curious and want to explore Rust yourself, here are a few great starting points:
Final Thoughts
Apple’s move to Rust is strategic, subtle, and smart. It’s not about abandoning Swift — it’s about using the right tool for the job. By adopting Rust in performance-critical, safety-sensitive domains, Apple is future-proofing its stack.
For developers, this means:
- Don’t panic: Swift isn’t going anywhere.
- Get curious: Learning Rust could open new doors, especially in systems or infrastructure roles.
The takeaway: you won’t wake up tomorrow writing iOS apps in Rust. But when the next evolution of Swift and iOS arrives, it may very well be Rust-flavored.
And when that switch flips, you’ll want to be ready. 🚀
Sources
For those interested in digging deeper, here are the main sources and community discussions referenced in this piece 👇
