A mental math app built around speed, streaks, and serious practice

Velox is a mental math training product built around a sharp promise: beat your calculator, then keep improving with structured practice. The app had to work as a public web product and as a store-ready mobile app without splitting the codebase. The brief was not just "make a math app". It needed a 60-second challenge that anyone could understand, a deeper Math Gym for repeat practice, lesson progression, records, streaks, language-specific training, and a payment path that would survive real App Store and Play Store review.

“Velox needed to feel like a game in the first minute, then behave like serious learning software once the habit started.”

Education apps fail when the first session feels like homework and the long-term system feels like a dashboard. Velox needed both loops. The first loop is fast: a challenge, a score, a reason to try again. The second loop is durable: weak-spots training, curriculum unlocks, leaderboards, achievements, and progress records. Treating those as one product system meant the landing page, mobile shell, practice model, subscription gates, and analytics all had to tell the same story.

We built Velox as a Vite + React 19 application with Capacitor powering iOS and Android builds. Firebase handles authentication and progress data, RevenueCat handles native subscriptions, and the app uses a shared React surface for the web product, mobile shell, and marketing site. The latest release added multilingual app and training-language controls, refreshed the landing page around real app screenshots, tightened the Math Gym practice model, and made the subscription experience native enough for mobile users while still keeping the web route useful for acquisition.