DEV Community

AI Challenge for Cross-Platform Apps AI Challenge for Cross-Platform Apps

Challenge ends soon!

Submit your entry now

DAYS
:
HOURS
:
MINUTES
:
SECONDS

AI Challenge for Cross-Platform Apps

Please sign in to follow this challenge

From zero to project in 10 seconds!

Challenge Status: Live Ended
Submissions Due: December 07, 2025 23:59 PT

Running through December 7, the AI Challenge for Cross-Platform Apps invites you 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 the perfect opportunity to explore building apps that run everywhere: iOS, Android, Windows, macOS, Linux, and WebAssembly - all from one codebase. There will be one winner for each prompt and each winner will receive: - $1,000 USD

  • Exclusive DEV Badge
  • DEV++ Membership All Participants who submit a valid and qualified entry will receive completion badge on their DEV profile.

We hope you give it a try!

Key Dates

  • Contest start: November 19, 2025
  • Submissions due: December 07, 2025
  • Winners announced: December 18, 2025

Badge Rewards

Uno Platform Challenge Winner Badge
Uno Platform Challenge Winner Badge
Uno Platform Challenge Completion Badge
Uno Platform Challenge Completion Badge

Sponsored by Uno Platform

Uno Platform enables .NET developers to build native cross-platform apps from a single shared codebase, powered by the most complete open-source platform and AI-powered enterprise-grade tools.

Challenge Prompts

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."

In order to participate, you will need to sign up for Uno Platform Studio and publish a post using the submission template below.

Submission Template

Judging Criteria:

  • Use of underlying technology
  • Usability and User Experience
  • Accessibility
  • Creativity

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.

In order to participate, you will need to sign up for Uno Platform Studio and publish a post using the submission template below.

Submission Template

Judging Criteria:

  • Use of underlying technology
  • Usability and User Experience
  • Accessibility
  • Creativity

AI Acceleration

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

What to do:

  • Build a simple cross-platform Uno Platform app using a public or sample API like JSON Placeholder, or check out 7 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 or OpenAI Codex 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.

In order to participate, you will need to sign up for Uno Platform Studio and publish a post using the submission template below.

Submission Template

Judging Criteria:

  • Use of underlying technology
  • Usability and User Experience
  • Accessibility
  • Creativity

Helpful Links & Resources

Frequently Asked Questions

Participation

Can I submit to multiple prompts?

Yes, you are welcome to submit to multiple prompts.

Can one submission qualify for multiple prompts?

Yes, if your submission offers a solution to multiple prompts, it can qualify for multiple prompts.

Can I submit to a prompt more than once?

Yes, you can submit multiple submissions per prompt but you'll need to publish a separate post for each submission.

  • In the event that you may win two or more prompts, and your submission is very close with another participant, we will favor the other participant.
  • In the event that you do win two or more prompts, you will only receive one winner badge.

Can I work on a team?

Yes, you can work on teams of up to four people.

  • If you collaborate with anyone, you'll need to list their DEV handles in your submission post so we can award a badge to your entire team! Please only publish one submission per team.
  • DEV does not handle prize-splitting, so in the event that your submission wins, you will need to split the prize amongst yourselves. Thank you for understanding!

How old do I have to be to participate?

Participants need to be 18+ in order to participate.

If I live in X, am I eligible to participate?

For eligibility rules, see our official challenge rules.

Submission

Can my submission include open source code?

Riffing on open source code and borrowing and improving on previous work/ideas is encouraged but it's important your changes are significant enough to ensure your submission is valid.

When does riffing become plagiarism?

It will depend, but transparency is important, license compatibility is important. You can use someone else's code to give you a jumpstart to demonstrate your ideas on top of someone else's base, but not just re-package the base. It should be clear to the judges what you added to the project in terms of the code and conceptual inspiration. This means, you should clearly state what you were building on and what elements are original to this new submission. When building on existing code, we expect a significant change that adds something tangible to the output. i.e. a new animation, and new sprite, a new function, a new presentation. Not just changes to the source - i.e. changing colours, changing one sprite, changing one function.

What happens if my submission is considered plagiarized or invalid?

Anything deemed to be plagiarism will not be eligible for prizes. Incidental plagiarism may simply result in your disqualification from the challenge (regardless of the number of other valid submissions you have published). Egregious plagiarism will result in your suspension from DEV entirely. Any non-generic, non-trivial usage of prior work, including open source code must be credited in your submission.

Do submissions have to be in English?

Non-english submissions are eligible for a completion badge but not eligible for prizes due to the current limitations of our judges. We will not be judging on mastery of the English language, so please don't let this deter you from submitting if you are not a native English speaker! We hope to evolve this in the future to be more accommodating.

Do I need a license for my code?

You are not required to license your code but we strongly recommend that you do. Here are some you may consider: MIT, Apache, BSD-2, BSD-3, or Commons Clause.

Can I use AI?

Use of AI is allowed as long as all other rules are followed. We want to give you a chance to show off your skills in realistic scenarios. If you use AI tools to help you achieve your submission, all the power to you.

Judging and Prizing

Can there be ties?

In the event of a tie in scoring between judges, the judges will select the entry that received the highest number of positive reactions on their DEV post to determine the winner.

How will I know if I won?

Winners will be announced in a DEV post on the winner announcement date noted in our key dates section.

When will I receive my DEV badge?

Both participation and winner badges will be awarded, in most cases, the same day as the winner announcement.

When will I receive my prizes?

The DEV Team will contact you via the email associated with your DEV profile within, at most, 10 business days of the announcement date to share the details of claiming your prizes.

What steps do I need to take to receive my cash prize?

The winner (including each member of a team) may be required to sign and return an affidavit of eligibility and publicity/liability release, and provide any additional tax filing information (such as a W-9, social security number or Federal tax ID number) within seven (7) business days following the date of your first email notification.

AI Challenge for Cross-Platform Apps Rules

NO PURCHASE NECESSARY. Open only to 18+. Contest entry period ends December 7, 2025 at 11:59 PM PST. Contest is void where prohibited or restricted by law or regulation. All entries must be submitted during the contest period. For Official Rules, see AI Challenge for Cross-Platform Apps Contest Rules and General Contest Official Rules.