The app's own text follows this. Doa translations stay in Indonesian — the corpus is Indonesian, and no English translation exists for it.
Memorisation marks, counters and settings are kept on this phone only. Nothing is sent anywhere while you are signed out.
The simulations are a learning tool — not a fatwa, and not tax advice.
Doa text from bekalislam.online; tahsin material from Al-Itqon by Ustadz Wawan Seftiawan, Lc.
Works without a signal. Pages you have opened stay available.