The Viral Growth Calculator helps you estimate the effect of a viral loop.
Wish friends would use your referral codes when signing up for new services but don’t want to spam everyone on Facebook? Curious what services your friends use?
ReferCodes lets you put your referral codes for popular services (Uber, Airbnb, Coinbase, etc.) all in one place (with a nice short URL, e.g. refer.codes/jeff) and helps friends find them.