Storefronts last tested between 2022-12-07 and 2024-03-28. Trivia: Knowledge Trainer Pro was tested in 99 Apple App Store storefronts — available in 93; unavailable in 6 (Austria, Republic of the Congo, Switzerland, China mainland, Chad, France).Roughly 1.5 billion people live in the 6 storefronts where it is unavailable. App unavailability does not by itself prove censorship.