CalSync - Local Calendar Sync

4 Downloads 10 Views v1.9 17.29 MB 4.1+

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(17.29 MB)

Editor's Overview

CalSync - Local Calendar Sync is a calendar & agenda application developed by Henrique Couto, packaged as a single Android APK of version 1.9 weighing in at 17.29 MB. The package targets Android 4.1+ and above. Below you'll find the publisher's own description, a quick spec sheet, and a short buyer-beware checklist so you know exactly what you're installing before tapping download.

Install Checklist

Only download through the button on this page — never from third-party mirrors or shortened links, which are the most common way malware spreads.
File size is a light 17.29 MB, so it installs quickly even on modest connections.
This build is signed by "Henrique Couto" — always verify the developer name matches what's listed on the app's official store page before installing an update.
After install, Android may prompt you to allow "Install from unknown sources" — approve only this one install, then revoke the permission in Settings > Apps > Special access.
We link directly to the APK file or the publisher's repository; we do not modify the binary. Always run a virus scan after any sideloaded install.

About this app

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.

Details

Version	v1.9
Size	17.29 MB
Developer	Henrique Couto
Category	Calendar & Agenda
Package	dev.henriquecouto.calsync
Android	4.1+
Last Updated	Oct 29, 2026
Downloads	4

Frequently Asked Questions

Is CalSync - Local Calendar Sync free to download?
Yes. The APK file linked from this page is free. The developer may offer in-app purchases once installed, but obtaining the installer itself costs nothing.

What Android version does CalSync - Local Calendar Sync require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.

Is CalSync - Local Calendar Sync safe to install?
We link to the exact APK published by Henrique Couto. We do not modify the file. Still, as with any sideloaded app, scan it with a reputable antivirus before opening it, and only grant permissions the app genuinely needs.

How do I update CalSync - Local Calendar Sync?
Install the newer version on top of the old one — Android will keep your data. If the signature differs, uninstall first (you may lose local progress).

Why is the app not installing?
Common causes: not enough storage, an older Android version than 4.1+, or a conflicting build already installed. Free up space, check your OS version, and uninstall any previous copy before retrying.

How to Download & Install CalSync - Local Calendar Sync

Tap the Download APK button above and save the file to your device.
Open your device Settings → Security (or Apps → Special access → Install unknown apps) and allow your file manager or browser to install unknown apps for this one file only.
Open the downloaded dev.henriquecouto.calsync.apk file from your Downloads folder.
Tap Install and wait for Android to finish.
Open «CalSync - Local Calendar Sync» by Henrique Couto and grant only the permissions it actually needs.
Revoke the "unknown sources" permission once you are done installing.

Note: this page hosts or links to the installer only. The application name, icon and description are provided for identification. All trademarks belong to their respective owners.