"Unchanged" compares the Top 10 as of the most recent tracked day during July 2026 against our earliest tracked snapshot in that same period. For a completed month or week that's a full before/after comparison; for the current, in-progress period it grows closer to one as more days accumulate. "Days held" counts how many days each app appeared anywhere in that chart's Top 10, out of every calendar day during July 2026 — days we have no history for count against the total, so a newer addition to the Top 10 will naturally show a lower fraction even if it's held the top spot every single day since. Free tends to churn fast (new viral hits displacing yesterday's); Grossing tends to be far stickier (established live-service games with entrenched spend) — this page is built to make that contrast visible, not to imply one chart is "better." Switch between month and week views above; a completed period only shows as selectable once it has enough tracked days to be a real comparison, not just a handful of spot checks.