While Cambly is not a free service, students can earn more minutes by sharing Cambly with their friends. Students can find their referral link by clicking on "Get Free Minutes" on the app or the website.
When a student refers their friends, their friends will each receive 15 free minutes on Cambly to try it out. For each of the student's friends who purchases, the student will also receive 15 minutes for free. Students can track which ones of their friends signed up from their Referrals page here: https://www.cambly.com/en/student/referrals