Cosmos is a visual research tool built around "clusters" — save images, screenshots, and links from anywhere and it auto-tags them by color, mood, and style so you can search your own saved collection visually instead of by keyword.
The auto-tagging is the actual differentiator over a plain Pinterest board — you can filter your saves by palette or visual similarity, and it also tries to surface who made the original work, which matters if you're referencing rather than just collecting.
Good for designers building out a personal or team moodboard library over time — the value compounds the more you save, less useful for a one-off "find me ten homepage examples right now" search.
It's a following-based feed at heart, so your discovery quality depends heavily on who you follow early on; a fresh account with no follows feels thin until you invest time curating who you're seeing.