Neither store announces an algorithm change. You find out because your rankings moved and you spend a week wondering whether it was you.
Applyra already measures hundreds of thousands of positions every day, which turns out to be exactly what you need to answer that question. The detector compares each day's ranking movement against the normal volatility of that store and country, and flags the days that stand out.
It works. Apple's late July recalibration shows up at fourteen times a normal day. Google Play's update on 14 September registers at more than ten times normal across all 41 countries we track, the largest event of 2026. It also shows the boring truth the rest of the time: Google Play is systematically noisier on Tuesdays and Fridays.
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