KickoffLabs is a great platform for collecting leads and running viral contests. We make it easy to setup refer a friend style contests, giveaways, sweepstakes, and product launches.
You can build out amazing marketing experiences with our script platform and developer APIs. We have some best practices outlines here that teach you how based on your goals. Get started here
In most cases, we recommend using the AnyForm for custom pages instead of adding leads directly via the API