Giving users financial incentives to invite their friends on the app

Revolut rewards users with "free money" for spreading the word about the app. Note that conditions to receive the €25 dollar coupon are onerous. With the "Complete 3 purchase transactions with Revolut" condition, Revolut makes sure that they only spend money for active users.

Instead of offering a cash-based incentive, Accountable offer 1m of pro usage for both the referree and the referrer

Busuu pushes you to invite your friends to get 30 days of free premium. Looking more closely, users can invite up to 12 friends, and as the offer is cumulative, they can get up to 1 year of free premium.

Meditopia displays a CTA on the home screen to invite friends and get 2 weeks of premium in return.

Bux Zero's "Free share" section is kind of a "Invite friends" section. The incentive is very simple: 1 active friend on the app means 1 share offered by Bux Zero.

Whatnot fosters user acquisition and spending in the app by offering $3 per friend invited.