Five Years of Jetpack Compose: Reflecting on the Declarative Revolution in Android Development

By Rebecca Franks, Nick Butcher, and Loryn Hairston

On July 28, 2021, the Android ecosystem witnessed a seismic shift. With the official release of Jetpack Compose 1.0, Google fundamentally altered the way developers interact with the Android platform. Five years later, as we celebrate the release of version 1.11, it is clear that Compose was not merely a new library, but a paradigm shift that moved the industry away from the imperative constraints of the past toward a fluid, declarative future. Today, with over 68% of the top 1,000 apps on the Play Store utilizing Compose in production, we reflect on a half-decade of innovation, community collaboration, and the definitive end of the "findViewById" era.

The Genesis: From Two Paths to One Unified Vision

The story of Jetpack Compose began long before the 1.0 announcement. Inside the corridors of Google’s Android team, two distinct projects were running in parallel, each aimed at solving the inherent complexities of UI development.

The first effort was focused on unbundling the traditional View-based UI toolkit. The objective was to modularize the system, allowing for faster development cycles and decoupling the UI framework from the OS release schedule. Simultaneously, a separate, more ambitious research team was exploring the potential of a declarative UI framework—a concept that would allow developers to define their interfaces as functions of their state, rather than as static objects to be manipulated manually.

Early prototypes of this vision involved embedding XML-like structures directly into Kotlin code. While the syntax was experimental, the promise was revolutionary. By merging these two efforts, the team moved away from the fragile, boilerplate-heavy architecture of the past. The result was a sophisticated, compiler-backed system that utilized the full power of Kotlin, enabling developers to write code that was not only more concise but significantly more intuitive.

Chronology: A Timeline of Growth

The evolution of Compose is a testament to iterative design and aggressive expansion across the hardware landscape.

• Pre-2021 (The Exploration Phase): During the pre-alpha and alpha stages, the team relied heavily on community feedback. The Android Dev Challenge was a defining moment, where developers from around the world flooded the team with "Puppy apps," clocks, and weather trackers. This feedback loop ensured that 1.0 wasn’t just technically sound, but practically useful for real-world scenarios.
• July 2021 (The 1.0 Milestone): The official launch marked the beginning of a "simpler, faster" era.
• Post-2021 (Cross-Platform and Multi-Form Factor): Compose quickly outgrew its origins as a mobile-only tool. Support was expanded to WearOS, followed by Jetpack Compose for TV.
• The Era of Integration (Glance and Glimmer): With the introduction of Glance, developers could build home-screen widgets with the same declarative syntax. More recently, the development of Jetpack Compose Glimmer has brought the framework to augmented reality and display glasses.
• 2026 (The Compose-First Era): At Google I/O 2026, the team made the landmark announcement: Android is now "Compose-first." The legacy View toolkit has been placed in maintenance mode, signaling the formal conclusion of the imperative UI era.

Supporting Data: The Scale of Adoption

The numbers speak for themselves. The transition to Compose has been one of the fastest adoption cycles in the history of the Android platform. With more than 68% of the top 1,000 apps now running Compose, the industry has effectively standardized on declarative UI.

This adoption is not limited to simple layouts. The transition has enabled more sophisticated design systems, shifting from Material 2 to the modern, expressive capabilities of Material 3. The sheer volume of community-contributed libraries—ranging from Jake Wharton’s Mosaic for terminal-based UI to Saket Narayan’s Touch Robot for gesture testing—highlights the extensibility of the Compose compiler and runtime.

Official Perspectives: Looking Under the Hood

To mark the five-year anniversary, we sat down with the architects of the platform for a special edition of Android Developers Backstage. The episode features Clara Bayarri (Engineering Lead for Jetpack), Romain Guy and Chet Haase (former leads), and Tor Norbye (Senior Engineering Director).

The conversation reveals that the success of Compose was never guaranteed. The team faced massive challenges in balancing backward compatibility with the need to completely rewrite the UI rendering pipeline. "The hardest part," noted Clara Bayarri, "was ensuring that developers could migrate incrementally without having to rewrite their entire codebase overnight."

The panelists discussed how the "Compose-first" philosophy is not just a marketing shift, but a reflection of the current developer experience. By removing the need for findViewById and XML-based layout inflations, the team has reduced the surface area for runtime errors and significantly improved the build-time performance of large-scale applications.

Implications for the Future: Adaptive UI

As we look toward the next five years, the focus has shifted from "getting it to work" to "making it adaptive." With the release of version 1.11 and the upcoming 1.12, the framework is doubling down on adaptive primitives.

Developers now have access to robust APIs like FlexBox, Grid, and MediaQuery, which simplify the development of apps that must look and function perfectly across devices ranging from tiny wearables to massive foldables and desktop displays. The integration with Compose Multiplatform, supported by JetBrains, further extends this reach, allowing the same declarative logic to power iOS, web, and desktop interfaces.

This capability is crucial for the modern Android ecosystem, where the definition of a "device" is constantly evolving. Whether it is through the new style systems or advanced testing tools like Telephoto, Compose provides a unified language for developers to solve the fragmentation of the past.

The Community: The Heart of the Ecosystem

It would be a disservice to celebrate Compose without acknowledging the community that built the infrastructure surrounding it. The "Compose-first" world is built on the backs of independent developers who spent years creating wrappers, testing frameworks, and design libraries that filled the gaps in the early days.

From the weekly insights provided by AndroidWeekly and JetpackCompose.app’s Dispatch to the experimental UI magic created by developers like sinasamaki, the community has proven that Compose is a platform for creativity. The ability to use the Kotlin compiler to manipulate UI in ways never before possible—such as creating glitch effects or interactive ribbon modifiers—shows that the framework is as much a tool for artistic expression as it is for enterprise engineering.

Conclusion: Cheers to the Next Five Years

As we look ahead, the trajectory is clear. The "findViewById" era is a chapter of history, and the declarative future is the present. We are moving toward a world where UI is not just a collection of widgets, but a dynamic, state-driven reflection of the user’s intent.

This week, we invite you to join us in the celebrations. We are hosting in-person birthday parties globally, and on July 30th at 13:00 UTC, we will be hosting a live Q&A on the Android Developers YouTube channel. We want to hear from you—your favorite memories, your biggest challenges, and your hopes for the future of the framework.

Thank you to the engineers, the early adopters, the library maintainers, and every developer who filed a bug or shared a snippet of code. Jetpack Compose belongs to you as much as it belongs to us. Here is to the next five years of building beautiful, adaptive, and performant interfaces.

Happy composing!