Concentration is not free (it costs 1.99), however it doesn't contain in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
The price of Concentration is 1.99.
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Chart
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Category
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Rank
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---|---|---|
Top Paid
|
|
83
|
Top Paid
|
|
191
|
Top Paid
|
|
318
|