Qwiz – Building a daily global quiz app with synchronised leaderboards

Hacker News

Ello HN! I just shipped Qwiz after a few weeks of solo development. It's a daily trivia game where everyone worldwide gets the same 10 questions each day and competes on a global leaderboard. Interesting technical challenges I solved: Global Synchronisation: Ensuring all players worldwide get questions at exactly the same time across timezones. Used CloudKit with scheduled functions and local timezone calculations. Question Management: Built a content pipeline to manage 15k+ questions across 10 categories with difficulty balancing, duplicate detection, and fact-checking workflows. Real-time Leaderboards: Handling concurrent score submissions from thousands of users while maintaining accuracy. Implemented optimistic updates with conflict resolution. Analytics Engine: Custom system tracking performance across categories, improvement over time, and global statistics without compromising privacy. Performance: Keeping the app snappy while handling complex scoring algorithms, offline capabilities, and seamless syncing when back online. What I learned: Global time coordination is MUCH harder than I expected. Trivia question quality control and making sure its balanced and fair is surprisingly complex Users care more about consistent daily habits than feature complexity CloudKit's eventual consistency model required creative workarounds Tech stack: SwiftUI, CloudKit, custom backend for question management, Core Data for offline support. The app has 8 additional game modes (word puzzles, math challenges, etc.) but the daily global challenge is the core hook. Would love feedback from the community! Happy to answer questions about any of the technical implementation. LINK - https://apps.apple.com/gb/app/qwiz-daily-quiz-trivia-fun/id6...

Visit product View on Hacker NewsJun 30, 2025

Share card

Actual performance

1points

Did not reach leaderboard

Launch Intel predictions

Analyze your own launch →

Indie HackersFits the IH revenue-focused audience · Missing: supports, reddit linkedin, podcasting

93%93% predicted probability of success on Indie Hackers, based on ML models trained on real launch data.

best fitHighest predicted score across all platforms for this description.

Product HuntOn track for Day 1 leaderboard · Strong signals: model, apple, apps · Missing: mac, agents, macos

52%52% predicted probability of success on Product Hunt, based on ML models trained on real launch data.

TrustMRRLess likely to generate early MRR · Strong signals: apps, users · Missing: mobile apps, ios, personal

44%44% predicted probability of success on TrustMRR, based on ML models trained on real launch data.

AppSumoMay struggle as an AppSumo deal · Strong signals: users · Missing: plus, platform, intuitive

26%26% predicted probability of success on AppSumo, based on ML models trained on real launch data.

Hacker NewsMay not resonate with HN audience · Strong signals: ide, pipe, io · Missing: https docs, excited, just released

17%17% predicted probability of success on Hacker News, based on ML models trained on real launch data.

nativeThis product was originally launched on this platform.

Acquire.comPre-revenue stage for this audience · Missing: arr, mrr, revenue

15%15% predicted probability of success on Acquire.com, based on ML models trained on real launch data.

BetaListMay not resonate with beta-testers · Missing: web3, chat, crypto

0%0% predicted probability of success on BetaList, based on ML models trained on real launch data.

Correct prediction on native model

Similar products

Daily Quiz54%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Daily Quiz

Hacker News1

My retired dad and I made a daily, somewhat difficult, quiz54%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

My retired dad and I made a daily, somewhat difficult, quiz

Hacker News39

DataGuessr – a daily quiz that teaches global statistics through play66%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

DataGuessr – a daily quiz that teaches global statistics through play

Hacker News7

I'm 15 and building a live quiz app for classrooms: Quickz43%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

I'm 15 and building a live quiz app for classrooms: Quickz

Hacker News304

Experimenting gamification through frustrating quiz36%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Experimenting gamification through frustrating quiz

Hacker News2

Are You A Brogrammer? Take the quiz and find out31%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Are You A Brogrammer? Take the quiz and find out

Hacker News6

ng-quiz – an Angularjs quiz in spirit of the Ruby/Perl quiz29%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

ng-quiz – an Angularjs quiz in spirit of the Ruby/Perl quiz

Hacker News1

Am I Gay Quiz60%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Am I Gay? Take this quiz to find out!

Indie Hackers1productivity

Quizdle – 5 daily quiz questions31%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Quizdle – 5 daily quiz questions

Hacker News6

I made a quiz to find the best no-code tool for building a website51%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

I made a quiz to find the best no-code tool for building a website

Hacker News1

Browse all products Analyze your launch