“That's how I learned that ChatGPT was telling people to use RevenueCat when they asked how to do in-app purchases. All of a sudden I saw Claude, ChatGPT, like all the LLMs. I was like oh I wouldn't have even thought to ask about that.”

Open-text attribution survey caught ChatGPT as a referral source

A simple post-signup 'How did you hear about us?' survey with three preset buttons plus a free-form field is enough to discover non-obvious acquisition channels — including LLMs actively recommending your product. Worth a small UX sacrifice on a percentage of users to capture directional signal you'd never have guessed to track.