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When developing applications, one of the biggest challenges is managing multiple tasks simultaneously without the end-user noticing wait times or, worse, unexpected errors. Concurrency, which allows multiple operations to run simultaneously, has always been a complex topic in development. Swift, as a programming language, has gradually improved this aspect, and with the arrival of Swift 6, Apple aims to take a decisive step with Strict Concurrency.

Since Swift was released in 2014, the language has continuously evolved, becoming safer and easier to use. In Swift 5, async/await was a significant addition that made asynchronous code easier to write, making tasks like data downloading or UI updates more manageable and secure.

Now, with Swift 6 on the horizon, Apple has set out a series of improvements and changes that, while not immediately mandatory, will become the standard to follow in the coming years. From April 2025 onwards, all apps published on

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