For the first time in its history, Apple released three major operating systems on the same day. On September 16, 2024, macOS Sequoia, iOS 18, and iPadOS 18 all became available simultaneously, breaking the company’s long-standing pattern of staggered releases. Previously, iOS typically launched in September while macOS often followed in October or later.
The coordinated launch marked the conclusion of an eight-month development cycle that began at Apple’s Worldwide Developers Conference on June 10, 2024. At that morning’s keynote, the company announced macOS Sequoia, the twenty-first major version of its desktop operating system. The name continues Apple’s tradition of using California landmarks, this time referencing Sequoia National Park in the Sierra Nevada mountain range.
Developers received the first beta on the same day as the announcement. Apple then released the first public beta on July 15, 2024, giving general users approximately two months to test the software before the final September 16 release date.
The synchronized release carries practical implications for users. Features that depend on continuity between devices—such as Universal Clipboard, Handoff, and AirDrop—now work consistently from day one. When a user updates an iPhone, iPad, and Mac on the same day, they no longer face situations where one device has a feature that another cannot support because the operating systems arrived weeks apart. This simultaneous launch represents Apple’s strongest signal yet that it wants its hardware ecosystems to move in lockstep, a goal the company has pursued for years.
However, the September 16 release also marked a farewell. macOS Sequoia is the final version of macOS to officially support several older Mac models. The list includes the iMac Pro, the 2019 iMac, most Intel-based MacBook Pros (excluding the 2019 16-inch model and the 2020 13-inch model with four Thunderbolt 3 ports), the 2018 Mac Mini, and the 2020 Intel MacBook Air. While owners of these machines can run Sequoia, they will not be able to run its successor.
That successor, macOS Tahoe, arrived on September 15, 2025—almost exactly one year later. Tahoe drops support for all the models that Sequoia was the last to carry. This shift clearly marks Apple’s ongoing transition away from Intel-based hardware. Since late 2020, the company has been moving its Mac lineup to its own Apple Silicon chips, and each new macOS release has quietly narrowed the list of supported Intel machines. Sequoia served as the cutoff line for a significant portion of the remaining Intel fleet.
For developers, the June 10 beta release provided roughly three months to test applications against the new operating system before the public launch, a standard timeline for Apple. The July 15 public beta expanded the testing pool to anyone willing to install pre-release software and report bugs, allowing Apple to refine the operating system before the September ship date.
Whether this coordinated release pattern becomes a permanent shift remains uncertain. But by aligning development schedules, beta cycles, and final certification across separate teams that historically shipped on their own timelines, Apple has demonstrated it can achieve this logistical feat.
