The best open source alternative to Sync-in is Puter. If that doesn't suit you, we've compiled a ranked list of other open source Sync-in alternatives to help you find a suitable replacement. Other interesting open source alternatives to Sync-in are: Spacedrive, Nextcloud, Seafile, and OpenCloud.
Sync-in alternatives are mainly Cloud File Sync & Share Tools but may also be Cloud Storage Tools or Encrypted Storage Tools. Browse these if you want a narrower list of alternatives or looking for a specific functionality of Sync-in.
Puter is a privacy-focused personal cloud platform that securely stores your files, apps, and games, accessible from anywhere.

Puter offers a revolutionary approach to personal cloud computing, combining privacy, security, and accessibility in one comprehensive platform. Here's what makes Puter stand out:
Privacy-First Approach: Your data remains yours alone, with robust encryption and security measures ensuring your information stays private.
All-in-One Solution: Puter isn't just for file storage. It's a complete ecosystem for:
All seamlessly integrated into one secure environment.
Universal Access: Whether you're at home, in the office, or on the go, your entire digital world is at your fingertips. Access your files, use your favorite apps, and even play games from any device with an internet connection.
Intuitive Interface: Puter's user-friendly design mimics a familiar desktop environment, making it easy for anyone to navigate and use effectively.
Customization: Tailor your Puter experience to your needs. Organize your files, arrange your apps, and create a digital space that works for you.
By choosing Puter, you're not just getting cloud storage – you're embracing a new way of interacting with your digital life, one that prioritizes your privacy while offering unparalleled convenience and functionality.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
A cross-platform file manager that unifies your devices into a seamless, organized digital workspace.

Important: Development paused due to funding constraints (source).
Spacedrive revolutionizes file management by creating a virtual distributed filesystem across all your devices. This open-source application offers a unified interface to access, organize, and manage your files, regardless of their physical location.
Key benefits of Spacedrive include:
Spacedrive empowers you to take control of your digital assets, providing a seamless experience across all your devices and storage solutions. Whether you're a creative professional managing large media libraries, a developer organizing code repositories, or simply someone looking to declutter their digital life, Spacedrive offers the tools you need to create a more efficient and organized digital workspace.
Nextcloud offers on-premises file sync, sharing and collaboration platform with advanced security and privacy features.

Nextcloud is an open source, self-hosted file sync and share platform that allows organizations to store, share and collaborate on files securely.
Key features include:
Nextcloud is designed for organizations that need secure file sharing and collaboration while maintaining control over their data. It can be deployed on-premises or with a trusted cloud provider.
Some key benefits of Nextcloud:
Nextcloud is used by thousands of organizations worldwide, including major enterprises, educational institutions and government agencies. It provides a powerful yet easy-to-use platform for secure content collaboration.
Open source file sync and sharing platform with custom properties, AI automation, collaborative editing, and enterprise-grade security for teams.

Transform how you organize and collaborate on files with this powerful self-hosted solution that goes beyond traditional file syncing. Built for teams who need complete control over their data while maintaining seamless collaboration.
Key advantages:
Perfect for teams seeking:
Trusted by over 1 million users worldwide, this solution offers the perfect balance of powerful features and data sovereignty.
Enterprise-grade file management solution offering intuitive collaboration, seamless integration, and comprehensive security with full GDPR compliance.

OpenCloud delivers enterprise-level file sharing and collaboration with a focus on security, simplicity, and digital sovereignty. Built on 30 years of open source expertise, it provides organizations with powerful tools to make their knowledge more accessible and manageable.
The platform features an intuitive interface that new users can quickly master, while IT administrators benefit from straightforward deployment and integration. Security is paramount, with comprehensive features including end-to-end encryption, flexible access controls, two-factor authentication, and ransomware protection through secure versioning.
Key benefits include:
Whether serving public authorities, research institutions, educational organizations, or businesses, OpenCloud combines enterprise-grade security with user-friendly collaboration tools to help teams work more efficiently while maintaining complete control over their data.
A document management platform that helps you archive, organize, and search files with email ingestion, tagging capabilities, and powerful search functionality.

Papra is an open-source document management solution that brings order to digital chaos. With features like automated email attachment ingestion and intelligent document tagging, it streamlines how you organize and access your files.
Key benefits include:
Whether you're an individual looking to organize personal documents or a business seeking to improve document workflows, Papra provides the tools to make document management effortless and efficient.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
A peer-to-peer encrypted filesystem for secure file storage, sharing, and collaboration with end-to-end encryption and user-controlled data.

Peergos is a revolutionary platform that puts you in control of your digital life. Built on peer-to-peer technology and end-to-end encryption, Peergos offers a secure and private alternative to traditional cloud storage services.
Key benefits of Peergos include:
With Peergos, you can store, share, and collaborate on your files with peace of mind, knowing that your data remains under your control and protected from prying eyes. Experience the future of secure, decentralized file storage today.
Lightweight, self-hosted cloud storage built with Rust and Vue.js. Features end-to-end encryption, file sharing, search capabilities, and Docker deployment.

Hoodik is a lightweight, secure, and self-hosted cloud storage solution built with Rust and Vue.js. Designed with privacy at its core, it provides end-to-end encryption that protects your data from unauthorized access.
Key Features:
The intuitive web interface makes file management simple, while the robust architecture ensures your data remains private and secure. Perfect for individuals and organizations seeking a privacy-focused alternative to mainstream cloud storage providers.
Open source encrypted data storage solution offering secure file sharing, collaboration tools, and on-premises deployment for professional teams.

Secure your professional data with an open source encrypted storage solution that puts privacy first. Store, share, and collaborate on files with complete control over your data through on-premises deployment options.
Key features include:
Perfect for businesses seeking privacy-focused file storage without compromising on functionality. The platform combines enterprise-grade security with an intuitive interface, making it easy for teams of any size to collaborate while keeping sensitive data protected. Built by LINAGORA, a leader in European open source solutions.
Firefiles is an open-source alternative to Dropbox that lets you manage files across multiple cloud storage providers through a single interface.

Firefiles revolutionizes cloud storage management by offering a unified platform for all your storage needs. Here's what makes Firefiles stand out:
Multi-Provider Support: Seamlessly integrate with popular cloud storage providers like Firebase, AWS, Digital Ocean, Backblaze, and more.
Open Source: Fully open-sourced on GitHub, ensuring transparency and community-driven development.
Enhanced Security: Offers superior security and privacy compared to traditional cloud storage solutions.
User-Friendly Interface:
Efficient File Management:
Customizable: Set up your cloud drive with the backend of your choice.
Team Collaboration: Invite team members to your cloud drives (coming soon).
Cross-Platform: Available for MacOS, Windows, and Linux.
Firefiles is designed to be the last cloud storage solution you'll ever need, combining the flexibility of multiple providers with the simplicity of a single, user-friendly interface. Whether you're an individual user or part of a team, Firefiles offers a seamless experience for all your file storage and management needs.