An art historian aiming to build what she calls a global movement of matronage has created an AI tool that exposes the gender balance of any gallery's roster. Hall W Rockefeller, founder of the arts network Less Than Half, says the tool is designed to make visible the gap between male and female artists — and the structural ways women artists are kept from succeeding — while steering collectors' spending toward the galleries that genuinely support them. The tool is straightforward to use: feed it the URL of a gallery's artist roster and it breaks down the gender split, isolating each artist's name, researching them online and assigning a gender label. Galleries where women or non-binary artists account for at least half of the stable earn a Less Than Half Approved digital sticker to display. The organization previously assembled this kind of data by hand; Rockefeller says AI makes the work dramatically easier. The early results are stark. According to the app, women make up 35 percent of David Zwirner's 86-artist roster, 27 percent of Gagosian's more than 100 artists, and 43 percent of Hauser & Wirth's 113 artists and estates. The figures put hard data behind one of the market's longest-running complaints, and they arrive as the industry is still digesting surveys showing fragile trust in AI elsewhere. The strategy is deliberately economic rather than moral. By mobilizing women collectors to spend with intention — buying work by women and backing the galleries that develop their careers — the movement hopes to shift incentives rather than just attitudes. Whether a digital sticker can move consignments remains to be seen, but the tool gives the matronage campaign something it previously lacked: a public scoreboard.