Building Referral System for Explain Code APP

So Explain Code App (https://www.explaincode.app/) has been hitting it's growth milestones way ahead of what I thought. I'm sticking to my plan of building as more validation takes place.

Next up is a great referral system that rewards users who signup for early access and invite their friends to join them.

This will be a points based system, the more people a user invites to join the early access program. The faster they will gain access.

I spent last night building out the code system along with tracking the quantity of invites that result in a new user joining based on a code.

Next up, cool landing page after joining Early Access. Pushing that out today.

Does any one have any suggestions for a great viral referral system?

Vote below or let me know what you think in the comments.

Cheers.