Cairn

Get paid for your app
without selling out your users.

A white-label monetization layer for indie apps. Your users sustain you through money, referrals, or feedback. One key, one API, your design.

ContributionsPay-what-you-can fair share: money, retained referrals, or shipped feedback, normalized to one unit.

SponsorshipsFirst-party ad slots: house promos and flat-fee sponsors. No ad network, no third-party trackers.

Cairn is invisible. It returns data; your app renders every pixel in its own design. Your users never see “Cairn.”

Add your app

Keys live inside your account, never minted anonymously. Sign in with a one-time link to create a tenant and get your API key.

A cairn is a pile of stones built by many hands. The app stays standing because lots of people did what they could.