Threema central, non free, costs positive: open source app with documentation positive: functioning and transparent business model positive: no cryptocurrency or online payment systems planned! positive: multi-device capable positive: independent of phone number as identifier positive: customized version “Threema Libre“ for Android does not require proprietary software library from Google or other third parties unclear: tracker in Android app “Threma” (as payment versions cannot be checked by Exodus). But no trackers detectable in Android app “Threma work” (36 permissions): Exodus (external) positive: according to webbkoll (external) no third-party cookies and no third-party requests (third-party) negative: central service (= dependency) negative: no interoperability resp. no interface to chat standard XMPP negative: server code is not open source negative: no native desktop app

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Why not messenger XY?