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Apps whose maker has verified ownership get a small score component, because an active maker is a sign the app is kept up to date. It never decides a tier on its own. Updated daily.","components":["rating (App Store average across every App Store country, weighted by each country's rating count, banded)","votes (ratings: every App Store country combined once the weekly pass reaches the app, the best known count until then, on a log scale: 1 -> 40, 1,000 -> 70, 100k -> 90, 1M and up -> 100)","rank (best App Store search position for this list's terms, averaged over us, gb, ca, au, de; a store where the app is outside the top 50 counts 51 at rank 51, falling to 41 at rank 200; a store where it is outside the top 200 counts 30, and an app that no store ranks scores 0 once every search term of the list has been searched; until then such an app has no rank part)","recency (days since the current version, decaying after 60 days)","editors_choice (100 when the App Store shows Apple's Editors' Choice badge; absent otherwise)","ownership_verified (100 when the maker has verified ownership of the app; weight 1, like editors_choice; absent otherwise)"],"tiers":"Tiers follow fixed score bands: S from 90, A from 80, B from 70, C from 60, D from 50, F below. The list's leader is S if it scores 80 or more. On a list of 20 or more ranked apps, a tier from S to D takes in new apps only up to a quarter of the top 40: an app pushed out of a full tier falls to the next tier with room, and F takes the rest. An app already in a tier keeps its place while the tier is at most 2 apps over a quarter; past that, only the apps over that margin go down, lowest score first. Equal scores share a tier, and no app has a better tier than an app ranked above it. An app keeps its tier until its score passes the band edge by more than 1 point, or a full tier or the order above moves it. 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