Storefronts last tested between 2022-12-06 and 2026-07-08. Spark: Chords, Backing Tracks was tested in 14 Apple App Store storefronts — available in 13; unavailable in 1 (China mainland).Roughly 1.4 billion people live in the 1 storefront where it is unavailable. App unavailability does not by itself prove censorship.