Dont update if you download it before
I downloaded it Free before the last update 1.3.0 and you mention in (update note) the exist users will keep full access BUT this is NOT true !!why??
Callvent User Reviews
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Callvent – Calls to Calendar has limited verification signals. AppsHunter Legitimacy Score for Callvent is 48/100.
Based on 48 of 100 points across 7 verification signals from App Store and developer data.