Viral Loops

Viral Loops leans on templated campaign types — referral programs, giveaways, waitlists — that you can launch without building the mechanics from scratch. For a newsletter, the giveaway template gets used a lot: readers earn extra entries into a prize drawing by referring friends, which tends to produce a short, sharp spike in signups.

That spike-driven growth is different from the steadier, compounding growth referral networks like SparkLoop produce, so it's worth thinking of Viral Loops as a tool for a specific campaign — launching a newsletter, hitting a subscriber milestone — rather than an always-on growth channel.