Kit (ConvertKit)

Kit, known as ConvertKit until its 2024 rebrand, is an email marketing platform built specifically for creators — newsletter writers, course sellers, musicians, and authors — rather than for general ecommerce. It was founded in 2013 by Nathan Barry and is based in Boise, Idaho, running as a remote-first company.

The free plan is generous, covering up to 10,000 subscribers with landing pages and broadcasts. Paid tiers start at around $29 per month and scale by subscriber count, unlocking automations, sequences, and integrations.

The affiliate program is a long-standing favourite in the creator economy, paying recurring commission on referred subscriptions. Published rates vary between 30% and 50% depending on the source and the era of the program, with the higher rate typically running for the first 12 months. Verify your exact rate in the dashboard once approved.

The cookie window is reported at 60 to 90 days, and payouts are monthly via PayPal or bank transfer. Because Kit customers tend to stay subscribed for years and upgrade as their lists grow, the lifetime value per referral is unusually high for this category.