The short version: nothing that identifies you, ever. The long version is below, and it's genuinely short, because the list is genuinely short.
If you leave "Send anonymous usage data" enabled, EDDA sends:
0.2.0, windows x86_64.It never sends:
Reports are not linked to you: there is no user ID, no install ID, and no way for us to tell two reports came from the same person.
The Report tab sends what you typed, plus your app version and OS. Attaching the day's log is a separate checkbox, off by default, and labeled with exactly why: logs can contain the names of systems you visited. Nothing is sent until you press the button.
The galaxy heatmap is built from the community's public EDDN data feed that every Elite tool shares — not from EDDA users. It is deliberately blurry: cells are a hundred light years wide, nothing on it can name a system, and the map cannot be clicked to identify anything. It's weather, not surveillance.
Your journal, your market database, your routes, your settings — all of it lives on your machine and is read there. Downloading galaxy data from our server is an ordinary file download; route planning happens locally.
Changes to what's collected will be reflected on this page before they ship. EDDA is an unofficial third-party tool. Elite Dangerous © Frontier Developments plc.