How does decimal rounding of reviews to stars work in ios appstore? Starting from which average review score to get full 5 star rating?

[lcourse]

How does decimal rounding of reviews  to stars work in ios appstore?
Starting from which average review score to get full 5 star rating?

Duolingo has a 5 star rating, but I doubt that they really have an all time  review average larger than 4,75. In the google playstore their average of the android version is 4,6. Does anybody know how apple calculates the star ratings or has an URL reference where this is explained?

[Mobilio]

Mobile dev here!

So for all stores (AppStore + GooglePlay + Microsoft Marketplace + Amazon App Store + etc) algorithm is simple - they calculate ALL ratings on all versions. Some of them only for local store, other for global.

Example Duolungo:
https://itunes.apple.com/bg/app/duolingo-learn-spanish-french/id570060128?mt=8 <- this is in local Bulgarian Market. 4.928 in 9 ratings.
https://itunes.apple.com/us/app/duolingo-learn-spanish-french/id570060128?mt=8 <- in US market. 4.791 in 4068 ratings.
https://play.google.com/store/apps/details?id=com.duolingo&hl=en <- Worldwide. 4.648 in 2343538 ratings.

As you can see sites provide correct review rating to Google but they rounding it. Probably your guess for over 4.75 is correct. There isn't official explanation from Google about this. Some sites showing 5 star rating system. Other 10 star - 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5. For other it's complicated because i have seen even results as 4.2 and this is 100 star rating system.

[lcourse]

Peter, thanks a lot.

How did you get the 3 decimal ratings of the apps in itunes?

[Mobilio]

Get iOS or Google Play link of app and paste it on SDTT (Structured Data Testing Tool).

That's all. In SDTT they're even deep than 3 points...

[lcourse]

genius