CalSync - Local Calendar Sync
henriquecouto.dev
CalSync is a free and open source alternative to OneCal, CalendarBridge, and Reclaim.ai. It syncs and merges events between local device calendars — no cloud servers, no accounts, no subscription.
When an event appears in one calendar, CalSync automatically copies it to another using a name you choose. All syncing happens directly on your device. Your calendar data never leaves your phone.
⭐ FREE & OPEN SOURCE — No subscription, no hidden costs, no ads
📱 WORKS OFFLINE — No internet connection required, ever
🔒 100% PRIVATE — Calendar data stays on your device, period
👤 NO ACCOUNT — No signups, no logins, no personal info collected
🔄 AUTOMATIC BACKGROUND SYNC — Detects calendar changes within seconds
📝 CUSTOM EVENT NAMES — Choose what synced events are called (e.g. "Busy")
📋 SYNC PREVIEW — See exactly what will change before it happens
🗑️ DELETION MIRRORING — Remove an event from source, removed from target
🔄 RECURRING EVENTS — Repeat events stay in sync automatically
🎨 MATERIAL YOU — Adapts to your device's dynamic color theme
Perfect if you need to:
• Sync work and personal calendars to share availability
• Prevent double-bookings across multiple calendars
• Manage client calendars as a freelancer or consultant
• Keep family calendars in sync without sharing login credentials
If you're looking for a OneCal alternative, CalendarBridge alternative, or Reclaim.ai alternative — CalSync is the offline, private, and completely free solution.
No ads. No tracking. No telemetry. Just calendar sync that works.
When an event appears in one calendar, CalSync automatically copies it to another using a name you choose. All syncing happens directly on your device. Your calendar data never leaves your phone.
⭐ FREE & OPEN SOURCE — No subscription, no hidden costs, no ads
📱 WORKS OFFLINE — No internet connection required, ever
🔒 100% PRIVATE — Calendar data stays on your device, period
👤 NO ACCOUNT — No signups, no logins, no personal info collected
🔄 AUTOMATIC BACKGROUND SYNC — Detects calendar changes within seconds
📝 CUSTOM EVENT NAMES — Choose what synced events are called (e.g. "Busy")
📋 SYNC PREVIEW — See exactly what will change before it happens
🗑️ DELETION MIRRORING — Remove an event from source, removed from target
🔄 RECURRING EVENTS — Repeat events stay in sync automatically
🎨 MATERIAL YOU — Adapts to your device's dynamic color theme
Perfect if you need to:
• Sync work and personal calendars to share availability
• Prevent double-bookings across multiple calendars
• Manage client calendars as a freelancer or consultant
• Keep family calendars in sync without sharing login credentials
If you're looking for a OneCal alternative, CalendarBridge alternative, or Reclaim.ai alternative — CalSync is the offline, private, and completely free solution.
No ads. No tracking. No telemetry. Just calendar sync that works.
Developer email
email+calsync@henriquecouto.dev
Released
Jul 20, 2026
Current version
1.9.7
Android version
7.0
Screenshots
