Syncthing is an open-source, continuous file synchronization program designed to keep files consistent across two or more computers. Its primary purpose is to provide a secure and reliable way for individuals to synchronize their data, ensuring that files are always up-to-date and accessible across multiple devices. The project prioritizes user data protection, security, and ease of use above all else.

The core functionality of Syncthing revolves around continuous file synchronization. It monitors designated folders on each connected device and automatically detects changes, such as additions, deletions, or modifications. These changes are then propagated to all other connected devices, ensuring that the files remain identical across the network. This process is designed to be automatic, requiring minimal user intervention once configured.

A key feature of Syncthing is its focus on security. The program employs encryption to protect data during transmission, preventing unauthorized access or eavesdropping. It also utilizes cryptographic signatures to verify the integrity of files, ensuring that they haven't been tampered with. This commitment to security is reflected in the project's goals, which prioritize data safety and protection against attackers.

Ease of use is another significant aspect of Syncthing's design. The developers strive to make the program approachable and understandable for a wide range of users. While the core functionality is powerful, the user interface and configuration options are designed to be intuitive. The project also offers various GUI implementations for different operating systems, further simplifying the user experience.

Syncthing is designed to be universally available, aiming to run on a wide variety of computer systems. This includes support for common operating systems like Windows, macOS, and Linux. The project is mindful of the fact that users may not always have access to the latest technology, and therefore strives to maintain compatibility with a range of hardware and software configurations.

The project's goals are clearly defined and prioritized. The most important goal is "Safe From Data Loss," followed by "Secure Against Attackers." Other goals include "Easy to Use," "Automatic," "Universally Available," and "For Individuals." These goals guide the development process and ensure that the project remains focused on its core mission of providing a secure, reliable, and user-friendly file synchronization solution.

The repository provides comprehensive documentation, including a getting started guide, build instructions, and information on running Syncthing in Docker. Users can also find GUI implementations and access the forum for support and discussions. The project encourages community involvement and provides channels for reporting bugs and security vulnerabilities. Releases are signed with GPG keys, and macOS and Windows binaries are code-signed, further enhancing the security and trustworthiness of the software. The project is licensed under the Mozilla Public License Version 2.0 (MPLv2).