Waitlist API - Quick and easy waitlist with built in referral.
Glass - Refract, reflect, disperse, divide. A game of lasers and experimentation.
LaunchList - Create waitlist with referral for your product launch
Rich Kids - Photo sharing app where users pay $1000/mo to share
Waitlisty.io - Build excitement for your product by embedding a simple form into your website. Signups will receive a referral code to share with their friends. The more codes they share, the more they climb your waitlist.
Flashgap - Time-delayed photo-sharing app of last night's embarrassment