NeoCalDav Sync

Modern CalDAV Sync for Android — built for today’s secure web

This app provides fast, reliable, and HTTPS-only CalDAV calendar synchronization for Android. Designed as a modern replacement for legacy CalDAV sync tools, it works seamlessly with contemporary servers, strict TLS configurations, and the latest Android versions.

Unlike older sync apps, this application is built from the ground up using current Android APIs and networking libraries, ensuring compatibility, security, and long-term reliability.

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Security first

• HTTPS-only communication (no insecure HTTP fallback)

• Safe redirect handling — prevents protocol downgrade attacks

• Modern TLS support and strict hostname verification

• Fully compatible with hardened server configurations

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Full CalDAV support

• Automatic CalDAV discovery (/.well-known/caldav)

• Principal and calendar collection discovery

• Syncs events directly into the Android system calendar

• Works with popular CalDAV servers (self-hosted or hosted)

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Built for modern Android

• Optimized for Android 10–14+

• Battery-friendly background sync using WorkManager

• No deprecated libraries or legacy network stacks

• Respects system background and power-saving rules

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No legacy baggage

• No Apache HttpClient

• No outdated sync adapters

• No insecure cleartext traffic

• No Google dependencies required for syncing

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Ideal for

• Users with self-hosted CalDAV servers

• Privacy-conscious users

• Enterprise and custom CalDAV deployments

• Anyone frustrated with outdated CalDAV sync apps