GrowSurf

GrowSurf is referral software for SaaS, fintech and newsletter businesses, built around an API and JavaScript SDK rather than a store plugin. That makes it a natural fit when the referral has to happen inside your product rather than after a checkout.

Pricing scales with active participants, counted by unique email. Startup covers 2,500 for $179 a month or 5,000 for $279. Business runs from 10,000 at $449 through 25,000 at $649, 50,000 at $879, 100,000 at $1,139 and 150,000 at $1,429. Above that is custom. Annual billing saves between roughly $1,600 and $3,200 a year, and the plan auto scales with prorated upgrades if you pass a tier.

Startup includes two programs, two team members, analytics, customisable design, AI features, fraud protection, compliance tooling, tax forms, API and webhooks. Business raises that to five programs and five team members and adds a custom domain portal and real time support.

Tax forms and compliance on the entry plan are worth noting, because paying referrers cash creates reporting obligations that most tools at this price leave to you. The 14 day trial includes all paid features and integrations. Its documentation is aimed at developers rather than marketers, which is a fair signal of who it expects to install it.