The following list represents the top 10 most downloaded games on the iOS App Store from July 2010 through May 2018, according to the most widely cited App Annie report.
Important Note: Other sources from the same era offer slightly different rankings. For example, a 2015 report from KamaGames and Cult of Mac lists Despicable Me (likely a version of Minion Rush) at #5 and Angry Birds Rio at #8, omitting Honour of Kings and Asphalt 8 entirely. The list above is based on the 2018 App Annie data, which is the most comprehensive and authoritative source for the full 8-year window.
The search for a top 20 list for "iOS 8" fails for two main reasons:
If you genuinely meant the period when iOS 8 was the active operating system (late 2014), the global data is even more fragmented. Apple published country-specific year-end charts for 2014, not a global top 20. For example, the 2014 top paid iPhone games in the US included Heads Up!, Minecraft – Pocket Edition, and Cut the Rope 2. A complete, verifiable global list for that specific year does not exist in the available sources.
It's also worth noting that being the most downloaded doesn't make a game the most profitable. The all-time revenue chart for the same 8-year window looks very different:
Supercell's strategy of monetizing a smaller, highly engaged player base paid off enormously, with Clash of Clans generating more revenue than any other game despite having less than half the downloads of the top game.
The key takeaway: if you need a verified top 20 list for iOS games, the data simply does not support it. This top 10, supported by App Annie's industry-standard tracking, is the most authoritative ranking available for the first 8 years of the App Store.