About this app
Quickly learn the chemical formulas of the most important inorganic and organic substances and ions, taught in secondary education (high school), by taking the free multiple choice quizzes. Trivial name (common name), systematic name, or both are given, depending on their importance.
Latest release
What’s New
iOS 26 compatibility
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 21, 2026 · 12:25 PM Free
Screenshots
