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Every tool page has a heart-shaped Favorite button under its title. Click it, sign in if you haven’t already, and the tool is saved to your account — no limit on how many. Favoriting is the fast path into Kits too: your favorites show up as a pinned, un-deletable Favorites kit at the top of every “Add to kit” menu, and at /account/kit/favorites/ alongside your real kits.
Favorites is account-gated. Signed out, the button opens the sign-in dialog instead of saving anything — there’s no local/guest favorites list.

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Where it shows up

  • The heart on a tool’s own page, which fills in once favorited.
  • The Favorites row pinned at the top of a tool’s “Add to kit” menu.
  • /account/kit/favorites/ — the same workspace view as a real kit, for running a favorited tool inline.
Removing a favorite is immediate — no confirmation dialog, unlike removing a tool from a real kit.