EteSync
EteSync is an end-to-end encrypted and privacy-focused calendar and contacts manager. It allows users to keep their data private while syncing across devices. EteSync uses client-side encryption so only you have the decryption keys.
encrypted
privacy
calendar
contacts
sync
EteSync: End-to-End Encrypted Calendar & Contacts Manager
Private, secure, and feature-rich calendar and contacts manager with client-side encryption for seamless device syncing
What is EteSync?
EteSync is an open source, end-to-end encrypted, and privacy-focused contacts and calendar synchronization service. It allows users to keep their personal information and calendar events private while still being able to seamlessly sync their data across multiple devices.
Unlike most other sync solutions, EteSync uses client-side encryption rather than server-side. This means all encryption and decryption happens only on your devices, and EteSync's servers store fully end-to-end encrypted data that they cannot decrypt themselves. Only you have the decryption keys. This prevents third parties from accessing your sensitive calendar and contacts data without your consent.
EteSync aims to combine privacy, security, and usability. Setting up takes just minutes and works across iOS, Android, Linux, Windows, macOS, and the web. EteSync also handles conflict resolution and syncing deletions across devices.
While free accounts support core functionality, paid accounts provide additional storage and advanced features like shared calendars. The service is developed by a non-profit organization as an alternative to surveillance-based tech giants. For those wanting convenience without compromising privacy, EteSync presents an appealing self-hosted sync option.
EteSync Features
Features
- End-to-end encrypted sync
- Open source client apps
- Support for calendars, contacts, tasks
- Cross-platform - Android, iOS, Linux, macOS, Windows
- Self-hostable server option
Pricing
- Freemium
- Subscription-Based
Pros
Strong encryption protects privacy
Multiple client apps to choose from
Can be self-hosted for more control
Cons
Limited adoption so far
Self-hosting requires technical expertise
No offline access - requires internet connection
Official Links
The Best EteSync Alternatives
Top Online Services and Calendar & Contacts and other similar apps like EteSync
Here are some alternatives to EteSync:
Suggest an alternative ❐
Nextcloud
Nextcloud is an open source, community-driven cloud storage platform that allows you to take control of your files and data. It provides file hosting, syncing, sharing and collaboration features comparable to popular services like Dropbox or Google Drive, except it is self-hosted software meant to be deployed on your own...
ICloud
iCloud is a cloud storage and cloud computing service from Apple. It provides users with secure ways to store and access their photos, videos, documents, music, apps, backups, and more from any Apple device. iCloud enables seamless syncing across iOS, iPadOS, and macOS devices so everything is up to date...
BusyContacts
BusyContacts is a full-featured contact and customer relationship management (CRM) application designed specifically for Mac. It helps professionals, teams, and businesses organize, track, and manage contacts in one place.Key features of BusyContacts include:Customizable contact fields and layouts to capture all important contact detailsTags and groups for categorizing contactsComprehensive notes and...
Outlook4Gmail
Outlook4Gmail is a browser extension available for Google Chrome and Mozilla Firefox that integrates your Gmail account with Microsoft Outlook. It enables you to manage your Gmail emails, contacts, and calendar events directly within Outlook without having to switch between accounts.Once installed, Outlook4Gmail will automatically sync your Gmail data including...
DAVx5
DAVx5 is a full-featured, open source app for syncing calendars and contacts on Android devices. It supports two-way sync with various services using standard protocols like CalDAV and CardDAV.Some of the services it integrates with include Google Calendar, iCloud Calendar, Outlook.com Calendar, Nextcloud, and any other CalDAV/CardDAV servers. It provides...
GO Contact Sync Mod
GO Contact Sync Mod is an add-on that integrates with Gmail and Google Contacts to provide enhanced contact management and syncing capabilities.It allows users to securely connect multiple Gmail accounts and sync contacts between them. This makes it easy to eliminate duplicate entries and ensure all contacts are up-to-date across...
Contact PEA
Contact PEA is a cloud-based customer relationship management (CRM) software designed specifically for small businesses to organize contacts and manage interactions. Key features include:Contact Management - Store all contact details including names, companies, phone numbers, emails, addresses, and custom fields. Segment contacts with tags and groups.Task Management – Create, assign,...
ICSx5
ICSx5 is a comprehensive industrial control system (ICS) software package developed by ACME Corporation for managing and coordinating complex industrial operations. It is designed to provide a flexible, robust, and intuitive platform for process control, production scheduling, alarm and event management, data collection and reporting, and more in heavy industrial...
Sync2
Sync2 is a file synchronization and backup software for Windows and macOS. It provides an easy way to keep files synced across multiple devices and to backup important files to various storage options.Some key features of Sync2 include:Two-way sync to keep files on all devices up-to-date automatically.Support for syncing to...
E2ee cloud
E2EE Cloud is an encrypted cloud storage service focused on privacy and security. It uses end-to-end encryption so only you have the keys to decrypt your data - not even E2EE Cloud's employees can access your files.Here are some key features of E2EE Cloud:Client-side encryption - Your files are encrypted...
SyncMate
SyncMate is a powerful yet easy-to-use file synchronization and backup application designed specifically for macOS. It enables you to effortlessly sync your files and folders between your Mac computer and a wide variety of devices and online services, including:External hard drives and USB flash drivesOther Mac computers or Windows PCs...
AkrutoSync
AkrutoSync is a file synchronization and backup software application for Windows. It provides an easy way to sync files and folders across multiple computers and devices.With AkrutoSync, you can set up automatic, real-time file synchronization between desktops, laptops, network drives, and external drives. It will detect updates to files and...
Calendar Sync +
Calendar Sync+ is a cross-platform calendar synchronization application that enables you to keep your calendar updated and consistent across multiple devices and services. It provides synchronization between popular calendar platforms like Google Calendar, iCloud Calendar, Microsoft Outlook and more.With Calendar Sync+, you can make an event change or addition on...
Workice CRM
Workice CRM is a cloud-based customer relationship management (CRM) platform tailored for small and medium-sized businesses. It provides a centralized interface to manage all customer interactions and data in one place.Key features of Workice CRM include:Contact Management - Store all customer contact details and interactions in one place. Track companies...
Fruux
fruux is an open-source, self-hosted platform for storing and managing contacts, calendars, and tasks across devices. Some key features of fruux include:Open source - fruux is released under the AGPLv3 license, allowing users to host it themselves without vendor lock-inPrivacy focus - As a self-hosted platform, fruux enables users to...
OggSync
OggSync is a free, open source file synchronization and backup application for Windows, Linux, and macOS. It provides an easy way to keep files and folders synced across multiple devices or drives.Some key features of OggSync include:One-way or two-way syncing between foldersReal-time monitoring for instant syncing of new or updated...
Keep My Friends
Keep My Friends is a social networking app designed to help you nurture your closest personal relationships. Unlike broad social networks like Facebook that connect you with hundreds of acquaintances and distant relatives, Keep My Friends allows you to build an intimate circle of your nearest and dearest.At the core...
SpaRSS-DecSync
spaRSS-DecSync is an open source, self-hosted RSS reader and podcast manager. It provides a web interface for managing all of your RSS feeds and podcasts in one place, syncing between devices so you can read on the go, organizing subscriptions into customizable folders, full-text search across all posts, batch actions...
Micro CRM
Micro CRM is an open-source, self-hosted customer relationship management (CRM) system designed for small businesses. It provides a suite of tools to organize contacts, track leads, manage accounts and opportunities, and provide customer support.Some key features of Micro CRM include:Contact Management - Store all contact details including name, company, email,...
Social Contact Journal
Social Contact Journal is a user-friendly personal relationship management software designed to help individuals and teams stay organized, manage contacts, and build stronger relationships over time. It serves as a central database for logging all interactions whether they are in-person meetings, phone calls, or email exchanges.Key features include contact profiles...
Missing Sync
Missing Sync is an add-on for the Thunderbird email application that enables two-way synchronization of email, contacts, and calendar data between Thunderbird and Android devices. It allows you to access your personal information across multiple devices while avoiding lock-in to any particular cloud sync service.To use Missing Sync, you first...
Flock Sync
Flock Sync is a file sharing and collaboration platform designed for teams. It allows organizations to sync files across devices, enabling seamless collaboration.Some key features of Flock Sync include:Real-time file syncing across desktop and mobileDocument history and version controlComments, tasks, polls and remindersTeam calendar and video conferencingAdvanced permission controls and...
GeneralSync
GeneralSync is an easy-to-use file sync and backup solution for Windows, macOS, iOS and Android. It enables seamless file access across all your devices by synchronizing designated folders in real-time. GeneralSync keeps all your files up-to-date and available on each device linked to your account.With GeneralSync, you can choose to...
NextCall
NextCall is a feature-rich call tracking and analytics platform aimed at businesses that rely on the phone to engage with customers. It enables users to track phone calls from all sources to gain data-driven insights that can help increase sales and conversions.Key features of NextCall include:- Call tracking numbers with...
Tinyblu
tinyblu is an open-source note taking and task management app focused on simplicity. It provides a fast and lightweight way to jot down thoughts, notes, lists, and to-dos without unnecessary complexity.Some of the key features of tinyblu include:Create text notes with formatting options like bold, italics, highlights etc.Make checklists and...
GSyncing
gSyncing is an open-source, cross-platform file synchronization and backup application. It allows users to sync files between devices like desktops, laptops, phones, and tablets, acting like a private cloud storage service.Some key features of gSyncing include:Two-way sync - When files are changed or updated on one device, those changes are...
