Press kit
Facts, with sources.
Everything on this page is checked. If you need something that is not here, ask - an unverifiable number will not be invented for you.
The entity
- Legal name
- Maciej Dzierżek
- Form
- Sole proprietorship registered in the Polish CEIDG
- Place of business
- Warsaw, Poland
- Tax ID (NIP)
- PL7411885009
- Statistical ID (REGON)
- 280016640
The full registered address is on the privacy page, where the law requires it.
Numbers
| What | Value | Source |
|---|---|---|
| Questions in the QuizBase pool | over 1.1 million | QuizBase live counter |
| Open datasets underneath | 11 | QuizBase source register |
| Difficulty levels per question | 5 | - |
| Quiz games on Google Play | 5 | Google Play listings |
| API response time, 95th percentile | 101 ms at 50 requests/s, 0 errors in 15,002 requests | k6 load test on production, 27 May 2026 |
| Time to build a full quiz night in RoundKit | 5 minutes | - |
Verified 10 August 2026.
What each product is for
- Quiz Apps For people who play quiz.runriva.com
- RoundKit For people who host roundkit.runriva.com
- RunRiva app For people who host live app.runriva.com
- QuizBase For people who build quizbase.runriva.com
Logo
Two versions, SVG. Please do not recolour, rotate or stretch them.
Boilerplate
RunRiva is a one-person product studio in Poland making quiz tools and games. It runs QuizBase, a trivia API with over 1.1 million maintained questions; RoundKit, which turns a few clicks into a printable pub quiz night; and five single-subject quiz games on Google Play.