Import your collection
The closest thing to syncing that can exist: screenshot your sprites collection in game — or drop the JSON export another tracker gave you — and we will read the sprites off it and tick them for you. You check the result before anything is applied.
Drop a screenshot of your sprites
Open Lobby → Sprites in game, take a screenshot of the collection grid, then drop it here, paste it, or pick the file.
The first read downloads the reader — about 7 MB, once.
Coming from another tracker? Drop the JSON export it gave you and your sprites come across the same way.
Your screenshot or export file never leaves this device. It is read in your browser and forgotten as soon as you leave the page — the only thing downloaded is the reader itself, once.
Going the other way?
Nothing to export yet — tick some sprites in the tracker first.