Syndie is capable of reaching archives situated in the following anonymous networks: I2P, Tor, Freenet.

Syndie operates in a manner similar to blogs, newsgroups, forums, and other content tools; it allows one or more authors to privately or publicly post messages.

Messages are pushed and pulled to and from archive servers (other peers that choose to be), which are hosted in a variety of anonymous and non-anonymous locations.

Each user can control their forum; for example, they may wish to run a blog by not permitting other people to start threads, but allowing them to post comments.

Syndie is primarily a graphical application, based on the Standard Widget Toolkit for Java, but it can be run in a CLI (headless) mode.