PromoteKit

PromoteKit is affiliate software built directly on top of Stripe, aimed at modern SaaS companies that want tracking and payouts without a percentage of revenue disappearing into the tool. Customers include Aescape, Cleverly, Archive, Buzz and Osirion.

The pricing is the headline. A free tier covers your first three referrals, then Pro is a flat $29 a month with unlimited referrals, and Enterprise is custom for programs bringing in more than $10,000 a month from affiliates. Because the fee does not scale with your affiliate revenue, the effective cost per referral keeps falling as the program grows, which is the opposite of how percentage based tools behave.

Tracking works through affiliate links or coupon codes, and there are three ways to integrate: a code based API integration, a low code script, or a no code route using coupons alone if you would rather not touch the product. Commissions can be one time or recurring with tiering, the affiliate portal is white labelable, self referral fraud detection is built in, and payouts run through PayPal and Wise.

It is a narrower tool than the bigger platforms, with Stripe as a hard requirement. If that is your billing stack and you want predictable cost, it is hard to argue with $29 flat.