What are some alternatives?
When comparing Should I Make This? and Best Referral Programs, you can also consider the following products
Carrd - Simple, responsive one-page site creator.
Viral Loops for Startups - Virality for startups made easy 💪
Ship - Fast, native issue tracking for software projects
Referral Programs - Company referral programs aggregated in one place
Landing Pages by Viral Loops - Easily create a landing page for your referral campaign ✌️
How to grow like Dropbox - Build a Dropbox-style referral with this useful tool ✌️