Very little, and it varies by app — each app's own Privacy Policy states exactly what it collects, since the answer genuinely differs between them. None of the apps sell data or show ads.

Every app is built offline-first. Some content is downloaded on first launch, and everything works without a connection after that.

Every app is built for iPhone and iPad. Prarthana also has an Apple Watch app and widget. There's no Android release yet.

Each app has its own Support page, linked from that app's page here and from its App Store listing. You can also reach the studio directly from the Contact page.

The studio keeps building. Check back on this page — new apps appear here as soon as they ship.