Calendula is a modern, open-source calendar app for Android. It reads from the system calendar provider, so any source synced to your device — Nextcloud via DAVx5, Google, local, WebCal subscriptions — shows up automatically. The differentiator is the design: real Material 3 Expressive throughout, with dynamic color, expressive motion, and expressive shapes. V1 is read-only. Event creation, editing, and deletion are planned for V2. Privacy: zero telemetry, no analytics, no network access — your data never leaves the device.