Pluxia GmbH

Pluxia GmbH is a Swiss software company founded on December 1, 2023, and headquartered in Baar in the canton of Zug. It is the operator and developer of LearnClash, a mobile and browser-based quiz-duel application that pits players against real opponents in one-on-one matches while embedding learning-science techniques such as spaced repetition and retrieval practice into the gameplay. The company is closely held and led by its founder, David Moosmann, who serves as director and sole developer of the LearnClash product. LearnClash, the company's flagship offering, is positioned as "the quiz duel that makes you smarter." Players pick a topic, choose an opponent (a friend via link, a matched player, or one of six clearly labeled AI rivals), and answer six questions per round across an 18-question duel. After every answer, an explanation is shown, and an AI tutor called Clash can answer follow-up questions. Questions that a player misses are rescheduled through a three-stage spaced-repetition system: a missed question returns after 7 days, and once answered correctly it returns again after 90 days before being counted as mastered. Duels are turn-based, with each player given a 72-hour window to take their turn, making the format asynchronous and flexible. The app is free to play with no ads in any tier, and a Premium subscription is offered at $7.99 per month or $59.99 per year with a 7-day trial. LearnClash runs in English, German, French, and Spanish, and is available on iOS and Android as well as in the browser. The product shipped version 1.0 on March 1, 2026. As a company, Pluxia GmbH is a small, founder-driven operation. Moosmann built the app end to end — product design, mobile app, backend, marketing, and content — using a technical stack that includes Flutter 3.47 with signals.dart on the client and Firebase Cloud Functions plus Firestore on the backend. Matchmaking and ranking are built on the Glicko-2 rating engine, presented to users as a familiar ELO-style number. The company's stated mission is to make quiz competition genuinely educational, addressing the founder's observation that years of casual quiz dueling did not necessarily make players smarter.

Pluxia GmbH was founded on December 1, 2023, in Switzerland, and is headquartered in Baar in the canton of Zug. The company was established by David Moosmann, a software developer born in Tübingen, to build and operate LearnClash, a quiz-duel learning app. Moosmann serves as director of the company and as the sole developer of the product. The idea for LearnClash grew out of Moosmann's personal experience: he played roughly 18,000 quiz-duel rounds with his mother over 12 years on QuizDuel, and observed that despite the volume of play, neither of them actually became smarter. That observation led him to design a quiz game in which competition is paired with deliberate learning mechanisms. The result was LearnClash, which combines one-on-one duels against real opponents with explanations after every answer and a three-stage spaced-repetition system that resurfaces missed questions after 7 days and again after 90 days once answered correctly. Moosmann built the app end to end at Pluxia GmbH, covering product design, the mobile app, the backend, marketing, and the site's blog content. The technical stack includes Flutter 3.47 with signals.dart on the client and Firebase Cloud Functions plus Firestore on the backend, with Cloud Functions v2 used for AI question generation. Matchmaking and ranking are built on the Glicko-2 rating engine, presented to users as a familiar ELO-style number, with new players calibrating over about 10 duels across eight tiers. LearnClash shipped version 1.0 on iOS and Android on March 1, 2026. The app is free to play with no ads in any tier, and offers a Premium subscription at $7.99 per month or $59.99 per year with a 7-day trial. It runs in English, German, French, and Spanish, and is available both as a mobile app and in the browser. The company describes the product as "the quiz duel that makes you smarter," with a daily loop of picking a topic, playing a turn, learning from mistakes, and returning when missed questions are due again.

• Pluxia GmbH founded in Switzerland.

• LearnClash version 1.0 shipped on iOS and Android.

Educational quiz-duel app combining 1v1 competition with spaced repetition and AI tutoring; free to play with no ads.

• LearnClash

  A quiz-duel learning app where players compete 1v1 against real opponents, read an explanation after every answer, and retain knowledge through a three-stage spaced-repetition system. Available on iOS, Android, and browser; free with a Premium tier.

1. 1LearnClash: The Quiz Duel That Makes You Smarterlearnclash.com
2. 2About LearnClash: The Quiz Duel That Makes You Smarterlearnclash.com
3. 3David Moosmann, Founder of LearnClashlearnclash.com
4. 4Pluxia GmbHwikidata.org