Discover fun, interactive ways to learn about the latest technologies and frameworks. Solve a puzzle using memory debugging techniques or script a short film in AR with Apple’s speech synthesis engine. Design SwiftUI views with a time-hopping twist. Explore Create ML or build visualizations in Swift Playgrounds. No matter your level of expertise, challenge yourself to explore something new this WWDC — and share your creations with others through the Developer Forums (WWDC21-challenges), select Digital Lounges, and social media (#WWDC21Challenges).
Read the WWDC21 Challenges Terms and Conditions
Explore WWDC21 Challenges on the Developer Forums
Explore #WWDC21Challenges on social media
Tuesday

Speech Synthesizer SimulatorAccessibility & InclusionSimulate a conversation using speech synthesis.
Coming June 8.
Build an app that recognizes custom audio through ShazamKitAudio & VideoShazamKit lets you use custom audio catalogs inside your app to recognize that same audio “in the wild.” Dream up your own ShazamKit audio matching experience as you work off a starter sample project.
Coming June 8.
Create your first 3D model with Object Capture Augmented RealityObject capture provides a quick and easy way to create lifelike 3D models of real-world objects using just a few images. Use the new Object Capture Swift API to build your very own 3D model from scratch.
Coming June 8.
Design for declarative device management in your MDM solutionEducation & EnterpriseCalling all MDM developers and enterprise administrators! Explore designing new declarative device management solutions that move management policies from the MDM server to the device.
Coming June 8.
Design a quiz in Swift PlaygroundsEssentialsDesign a “How well do you know me?” quiz using Swift Playgrounds to see who knows the most about your quirks and interests.
Coming June 8.
Achievement Unlocked — Fabulous FailsGraphics & GamesCreating achievements that surprise and delight players as they make their way through a game can help provide a strong feeling of accomplishment, and even make people laugh. We challenge you to create or share a Fabulous Fails achievement that is fun, strange, and delightful.
Coming June 8.
Build an app using built-in Sound ClassificationML & VisionWith Sound Classification, you can create experiences for camera, video, productivity, and game apps on all Apple platforms — and for this challenge, we’re inviting you to explore a sample project and build your own.
Coming June 8.
Animated artistry in SwiftUISwiftUI & UI FrameworksPut trigonometry to good use and show us your artistic side by creating a stunning graphical animation in SwiftUI.
Coming June 8.
Wednesday

Large Text Challenge Accessibility & InclusionDesign for large text sizes by modifying the user interface of a simple app.
Coming June 9.
Design multi-step ShortcutsDesignThe best shortcuts help us get repetitive things done more easily: Develop a multi-step shortcut for designer or programmer productivity.
Coming June 9.
Memgraph capture the flagDeveloper ToolsOne of our engineers has hidden a memory easter egg in our secret app. We need your help to find it, but all we know is that it has the format flag_@WWDC. Using only macOS command line tools, investigate the memory issue, recover missing symbols, and capture the rogue flag.
Coming June 9.
Create a musical instrument in Swift PlaygroundsEssentialsThe first part to composing a musical masterpiece is making your own instrument from scratch! Use graphical tools to create a musical instrument that will leave your audience floored (and waiting for an encore)!
Coming June 9
Achievement Unlocked — Title TeasersGraphics & GamesSome achievements can pique a player's interest into exploring something new in your app — even if the achievement only has its locked text visible. We challenge you to write a Title Teaser achievement that gets people excited about what they might uncover.
Coming June 9.
Throwback with SwiftUI SwiftUI & UI FrameworksWhether you’ve been coding for 40 years, you’re new to the SwiftUI scene, or you’re a designer — everyone loves a good throwback. Give in to the nostalgia and imagine what your app might look like if designed for the Mac or iPhone interfaces of yesteryear.
Coming June 9.
Thursday

Voice Control Synonyms Accessibility & InclusionChallenge yourself to make your app accessible through Voice Control and provide support for voice-based interaction.
Coming June 10.
Explore spatial audio soundscapesAudio & VideoUse spatial audio to tell more immersive stories in your app and explore the demo used in the “Immerse your app in spatial audio” session.
Coming June 10.
Framework FreestyleAugmented RealityOne ARKit sample app. One framework of your choosing. What can you create in 100 lines of code or less?
Coming June 10.
Create amazing documentationDeveloper ToolsExplore Xcode's new documentation features and learn how to add documentation to your own framework or package — or to your favorite open source project.
Coming June 10.
Create fun visual effects in Swift PlaygroundsEssentialsEver wonder how to make it seem like confetti is raining down from the sky? Or how to create a kaleidoscope effect using code? This challenge gets you to create an artistic rendering using only shapes and your imagination.
Coming June 10.
Achievement Unlocked — Series FinaleGraphics & GamesWhether your game is divided into chapters, levels, or challenges, you can use achievements to help progress your narrative in unique and interesting ways. In our last challenge of the week — our series finale — we invite you to create a series of achievements that tell a story and encourage people to complete a set of tasks.
Coming June 10.
Bring hand pose and hand action classification to your appML & VisionStrike a pose — a hand pose, that is. You can train custom Hand Pose and Hand Action Classification models in Create ML, so we’re challenging you to train a model yourself that can detect a pose or action (or two).
Coming June 10.
Focus on Focus in SwiftUISwiftUI & UI FrameworksFocus can help people move through your app efficiently, whether they’re using the keyboard, Siri Remote, Apple Watch Digital Crown, or accessibility features. Find an interaction within your app and show us how you would use the SwiftUI Focus APIs to fine-tune that interaction.
Coming June 10.
Friday

VoiceOver Maze Accessibility & InclusionNavigate to the end of a dark maze using VoiceOver as your guide.
Coming June 11.
Create an engaging tutorialDeveloper ToolsLearn how to write an interactive tutorial to show developers how to use your own project — or add a tutorial to an existing open source project.
Coming June 11.
Sense the world around you in Swift PlaygroundsEssentialsJust like our senses, our devices constantly gather data from their environment, and can use that information to do interesting and important things. In this challenge, you'll harness this device sensor data to create a visualization or experience of your choosing.
Coming June 11.
Prototype with SwiftUI SwiftUI & UI FrameworksWhile SwiftUI is a powerful framework, one of its key features is its simplicity. Designers with very little knowledge of code can easily create prototypes with human-readable syntax and interactive Xcode Previews. As we say goodbye to WWDC21, we invite you to say “hello, world” with a brilliant SwiftUI-based prototype.
Coming June 11.


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