LinkedIn, WordPress, Firefox, Uber. Four companies that chose Swift. It wasn't by chance.

LinkedIn, WordPress, Firefox, Uber. Four companies whose products you probably use every week. Four companies that at some point decided to migrate significant parts of their code to Swift. They didn't do it because it was trendy, they didn't do it because Apple asked them to, and they didn't do it because it was the easiest path in the short term.

They did it because the code they had before was a problem that Swift solved better than any other available option.

What made Swift change the conversation inside companies

Objective-C was thirty years old when Apple introduced Swift in 2014. It was a powerful language that had been used to build millions of apps and decades of system APIs. It was also a language carrying decades of design decisions that, by 2014, had become hard to defend against modern alternatives.

Swift arrived with three concrete promises for companies that build software:

Compile-time safety. Swift makes entire categories of errors impossible to write, errors that in Objective-C or other languages only surface at runtime, in production, with real users. The compiler catches them before the code runs. For a company that measures software quality in production incidents, that has real, measurable economic value.

Performance comparable to C. Swift compiles to optimized native code that, in benchmarks of computationally intensive operations, sits on par with C and C++. For apps that process data, run real-time operations or need to respond with low latency, the difference compared to interpreted languages is significant.

Interoperability with Objective-C. Companies with existing Objective-C codebases don't have to rewrite everything to adopt Swift. They can do it gradually, module by module. That turns migration into a manageable process instead of a full replacement project nobody can fund.

The real cost of not adopting Swift

Companies still developing exclusively in Objective-C aren't in a stable position. They're in a position of technical debt that grows every year.

At every WWDC, Apple introduces new APIs and new frameworks written in Swift, with Swift-first interfaces that can be used from Objective-C, but with limitations and without the smooth development experience Swift offers. Every year there's more documentation, more training material and more developers on the market who know Swift better than Objective-C. Hiring developers who want to work in Objective-C in 2026 is getting harder and more expensive.

That doesn't mean Objective-C is going away tomorrow. Apple takes backward compatibility seriously. But the ecosystem that's growing, getting documented, attracting new talent and on which Apple is building its future is Swift.

Swift beyond apps: Server-Side Swift

There's a side of Swift that few companies know about, and it has real implications for those that already have iOS development teams.

Swift is a general-purpose language that runs on Linux with excellent performance. Frameworks like Vapor let you build complete backends in Swift, with the same type safety, the same async/await concurrency model and the same syntactic familiarity iOS developers already have.

For a company with an iOS team working in Swift, being able to share data models and business logic between client and server, with the same language and the same compiler, is a real efficiency. It isn't the answer for every backend use case, but for APIs that serve native iOS apps it's a combination worth considering.

Why it's part of our team training

At AC Academy, when we work with companies that want to train their development teams, or that want to bring in developers ready to work on their products, the starting point is always Swift.

Not because it's the only valid language. Because it's the language that lets a company build for the entire Apple ecosystem with maximum performance, maximum safety and full access to the hardware's capabilities. And because in a market where good Swift developers are scarce, training your own team delivers a return that hiring outside talent rarely matches over the long run.

LinkedIn, WordPress and Uber understood this once the alternative had become a problem. There's no need to wait until you get there.