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A recent change by Apple slashed the amount of data available about its App Store rankings, an important metric that the mobile industry relies on to generate revenue and usage and download estimates. 
The move by Apple cut the available data from 1,500 apps per category to 200, according to a recent notification sent to clients by Apptopia, an app-intelligence firm used by companies such as Visa, Coca-Cola, and Target.
Apptopia said the change “is impacting the entire industry” as rank is a “key input” for performance calculations. App Annie, another service for mobile data and analytics, also notified customers of the change. 
“Apple’s announcement does not come as a surprise. As app stores continue to modify available deep rankings, smaller app coverage will become more challenging,” App Annie CEO Theodore Krantz told Insider. “App Annie has been preparing for constraints like this for years.” 
The disruptions highlight Apple’s power. When the world’s largest technology company changes something seemingly small in its empire, entire industries scramble to adjust. 
“We have not changed our official charts or data services,” an Apple spokesperson wrote in an emailed statement. “The App Store shows 200 results per chart. To get significantly more rankings per category would likely have been the result of scraping deprecated unofficial chart content, which is not supported.”
Adam Blacker, an Apptopia spokesperson, said the company has been able to recover 500 rank spots per country and category since Apple’s change. 
“This is about the same number of rank spots that app-intelligence companies like ours are able to surface from Google Play, so I don’t believe it will have a large impact on Apptopia or our customers,” he added. 
Data on the top 10,000 apps per country is set to remain available as well.
“We do not expect this change to impact most of our customers given that the vast majority of app activity is happening within the top 10,000 apps in each country,” Apptopia told its clients. “This portion of the market is unaffected.”

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