For institutions.

Last updated 23 May 2026

Largesso is built around an idea museums, galleries, and archives keep telling us they want: a quiet audience that arrives knowing how to look. Gesso, our mobile app, surfaces work to people the moment their taste profile is ready for it. The mechanics that put your works in front of those people are the subject of this page.

API first

We only ingest from sources that publish a channel we can read — a documented REST or GraphQL endpoint, a SPARQL service, an OAI-PMH feed, a periodic CSV/JSON release on GitHub, or a partner-blessed CMS endpoint. We do not scrape. If your data is on a public collection page but not in a feed, we will not pull it; instead we will reach out and offer to either (a) co-design a feed with you, or (b) invite you onto our Presso web app, where you can place a small curated selection of works into Gesso yourself.

Live audit page

Every source feeding Gesso appears at largesso.com/sources. The page shows, per institution: the channel we ingest through, the licensing basis we recorded, the evidence URL we consulted, and the artwork count currently in Gesso. Rows only appear after a Largesso operator has manually validated the basis against the institution’s published policy. Scroll to your row to see what we are doing with your data, in production.

Takedown control

One email to support and we flip your source off Gesso the same day. We do not require a legal letter, a justification, or a sales call. If you change your mind a week later, the same email flips it back. The audit page reflects the change immediately.

No marketplace, no resale

Largesso is not a marketplace. We do not sell prints, run auctions, broker commissions, or take a percentage of anything. Gesso is a discovery surface; works link back to your canonical artist or exhibition page for everything that follows. If you want our users to buy from you, they get there by clicking your link, on your site, under your terms.

Attribution we honour

Every work in Gesso carries a credit string. The default is the institution’s name; if you mandate a specific format (e.g. “Courtesy {{your name}} and the artist”) we record that on the audit page and the app renders it verbatim. If your works require third-party rights clearance (ARS, VAGA, DACS), we route through those agencies for image use or omit the affected works entirely.

Reaching us

For partnerships, image-rights questions, takedowns, or to flag anything wrong on the audit page: support. We read every message and reply within a few days.