ViralityTest: A Reddit app to train your viral instincts

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  Home page: Select a subreddit or enter your own

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  Questions are dynamically generated

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  Your guess is scored in real time

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  See your result and challenge your friends on the same subreddit

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  App logo

🔥 ViralityTest

Everyone wants to go viral online— do you know what separates a viral post from one that gets ignored? ViralityTest was inspired by the idea that you can train your intuition for what makes content blow up. By challenging yourself to guess the upvotes of real Reddit posts, you’ll learn to spot the patterns and ingredients of viral success.

Built as a submission to the Fun and Games with Devvit hackathon.

See the demo video here: https://youtu.be/Dx8eSza9B0Q

Try it out live on reddit: https://www.reddit.com/r/viralitytest_dev/?playtest=viralitytest

What it does

ViralityTest is a quiz game that pulls live posts from Reddit and asks you to guess how many upvotes each received. You’ll get instant feedback, see how close your guess was, and build your skills at identifying what makes a post go viral. The better you get, the more you’ll understand the secrets of viral content—and you can use those insights to make your own posts stand out.

How we built it

We built ViralityTest using React, TypeScript, Devvit, and Tailwind CSS. The app fetches real-time data from Reddit, dynamically generates quiz questions, and provides smooth feedback animations. The UI is designed for both desktop and mobile users. We focused on modular code, modern design, and a fun, intuitive experience.

Challenges we ran into

Reddit’s post API can sometimes give unexpected post results; and filtering out low-quality or irrelevant posts was tricky. We also had to balance the scoring system to make it fair for posts with very different upvote counts. Ensuring a smooth user experience across devices and handling edge cases (like posts with zero upvotes) required careful attention.

Accomplishments that we're proud of

We’re proud of creating a game that’s both fun and easy to plan. The app teaches users to recognize viral patterns, provides instant feedback, and makes learning about virality engaging.

What we learned

We learned a lot about what makes content go viral—and how hard it is to predict! Building the scoring system taught us about power-law distributions and the psychology of guessing. We also deepened our skills in React, TypeScript, and API integration.

Potential future work

We’d love to add more features: leaderboards, multiplayer challenges, deeper analytics on what makes posts go viral, and maybe even AI-powered hints. Expanding to other platforms and social networks could make ViralityTest even more useful for aspiring viral creators.

Play it here (public app link): https://www.reddit.com/r/viralitytest_dev/?playtest=viralitytest

Built With

• devvit
• nextjs
• react
• tailwindcss