This one’s for the builders who’ve been itching to put AI and cross-platform .NET to work on something real.

We’re teaming up with DEV to launch something fun (and a little bit spicy) for .NET devs: the AI Challenge for Cross-Platform Apps.

Your mission:
Use Uno Platform and its AI-powered tooling to build a real app that runs on mobile, desktop, and WebAssembly from a single .NET codebase — and show off what modern cross-platform looks like with AI in the loop.

👉 Join the AI Challenge for Cross-Platform Apps

Key details

  • Challenge window: November 19 – December 7, 2025

  • Winners announced: December 18, 2025

  • Prizes: $3,000 USD total, split across three themed prompts

  • Stack: .NET + Uno Platform + AI tooling (Hot Design Agent, App MCP, Uno Platform Docs MCP, etc.)

Uno Platform x DEV Challenge

We’re inviting developers to build native cross-platform apps from a single shared codebase using .NET and Uno Platform’s AI-powered tools.

Whether you’re exploring Uno Platform for the first time or leveling up your .NET skills, this challenge is a chance to:

  • Ship an app that runs everywhere (iOS, Android, Windows, macOS, Linux, WebAssembly).

  • Try Uno Platform Studio, the productivity boost .NET developers need to design, build, and ship modern apps.

DEV is where developers go to build in public, share what they’re learning, and show off what they’re building. Pair that with Uno Platform’s cross-platform + AI tooling, and you’ve got the perfect setup for a .NET challenge.

Welcome to the AI Challenge for Cross-Platform Apps.

3 ways to win

WOW Factor

Build something visually stunning and fun — fast. Create a coffee shop–style home screen (or any theme you like) that runs across iOS, Android, Windows, macOS, Linux, and WebAssembly — all from a single Uno Platform codebase.

What to do:

  • Start your project manually or kick it off using App MCP or Hot Design Agent for AI-assisted setup
  • Use sample or mock data — menus, images, orders, or anything that brings your concept to life.
  • Add simple interactivity such as lists, buttons, or animations.
  • Focus on creativity, performance, and smooth cross-platform experience

Tip: Keep it fun and visual,  your goal is to make people say “Wow.”

Hot Design Showcase

Experience the next generation of live app design using Hot Design Agent, your AI co-designer inside Uno Platform Studio.

What to do:

  • Open your project in Visual Studio or VS Code and launch Hot Design Agent
  • Pick any existing app or UI concept you like — mobile, desktop, or web
  • Let the agent help you design or adjust the layout in real time while the app is running
  • Modify controls, bindings, and data visually — the agent assists while you stay in control
  • Use Hot Reload to keep your IDE and design surface perfectly synchronized

Please note you’ll need to share a images and/or recordings as part of this submission. Focus on: Showing how AI and live visual design come together to make building beautiful, cross-platform .NET apps faster, easier, and more intuitive.

AI Acceleration

Demonstrate how contextual AI, Claude Code, GitHub Copilot, and OpenAI Codex accelerate app development using Uno Platform App MCP and Uno Platform Docs MCP.

What to do:

  • Build a simple cross-platform Uno Platform app using a public or sample API like JSON Placeholder, or free public APIs
  • Use App MCP to connect to your running app for structured, context-aware AI interactions
  • Ask Uno Platform MCP for grounded, official guidance as you build
  • Leverage GitHub Copilot/OpenAI Codex/Cursor etc. to generate and refine your code
  • Produce an app that runs on as many targets as possible — mobile, desktop, or web

Please note you’ll need to share a images and/or recordings as part of this submission. Focus on: Demonstrating how contextual intelligence and modern AI coding assistants help you build faster and smarter with Uno Platform.

Build to Win

The Uno Platform x DEV AI Challenge for Cross-Platform Apps runs from November 19 to December 7, 2025.
Submissions are open now.

Per-category prizes:

  • 🏆 $1,000 USD

  • 🏅 Exclusive DEV badge

  • 🔁 DEV++ membership

All participants who submit a valid, qualified entry will receive a completion badge on their DEV profile.

We can’t wait to see what you ship.

Ready to turn your idea into a cross-platform .NET app?

Join the Uno Platform x DEV AI Challenge
Start building with Uno Platform today and show the community what AI + .NET can do across every screen.

JOIN THE CHALLENGE