OpenPartner vs FirstPromoter: the SaaS-affiliate default, ten years on

If you’ve been in indie SaaS for any length of time, you’ve used or considered FirstPromoter. It’s the platform that gets recommended on threads, the one that just works, the one with PayPal payouts and a partner portal that’s been the same shape since 2018. It earned the recommendation.

It also hasn’t been the same product as the rest of its category for a few years now. The attribution stack underneath modern partner programs has changed — Safari ITP, cross-device sign-ins, GDPR, performance affiliates with their own trackers — and “where do I send the PayPal” is no longer the central question. This post walks through where FirstPromoter still excels and where the gap with newer platforms has opened up.

Where FirstPromoter still excels

Honestly:

• Maturity. It’s been live since the mid-2010s. The edges are sanded.
• PayPal-first payouts. If your partners are global and prefer PayPal, FirstPromoter has had this nailed forever.
• Simplicity. The product surface is small enough that a non-technical founder can set it up in an afternoon.
• Pricing predictability. Flat monthly tiers without GMV-percentage variability.

For a small SaaS with a handful of affiliates and PayPal as the payout rail, FirstPromoter is still a reasonable answer.

Where the gap shows up

Attribution stack age

FirstPromoter’s attribution model is essentially last-click within a configurable cookie window. That worked when third-party cookies worked. Today the question is what happens on Safari, on Firefox, on Brave, and on any cross-device sign-in.

OpenPartner’s stack treats first-party cookies as the click anchor and writes an Identity row at first identify so attribution survives:

• A 60-day signup gap on Safari (cookie expired at day 7, but Identity links userId to clickId server-side)
• Cross-device sign-ins (clicked on phone, signed up on laptop, both events tied to one Identity)
• A device with no cookie at all (every event from a known userId attributes via Identity table)

The further your buyer journey gets from “click and convert in the same session,” the more this matters. FirstPromoter tracks the click; OpenPartner tracks the user via clickId once they’re identified.

Attribution model flexibility

FirstPromoter is last-click. OpenPartner ships four models: last-click, first-click, linear, and position-based. You can switch models and re-derive history under the new model without losing the old one.

If you’re running a single-touch program (creator drops a link, person signs up), this doesn’t matter. If you’re running a multi-touch program (comparison-site review, then podcast mention, then signup), it does.

Data portability and self-hosting

FirstPromoter is hosted-only. Their export is a CSV from the dashboard.

OpenPartner is MIT-licensed and self-hostable. Even on the hosted plan, the export is a zip containing CSV, JSON, and a pg_dump-compatible SQL file with the full schema. You can openpartner import that zip into a fresh instance — clicks, identities, events all re-imported, attributions re-derived from raw data.

The practical version: if FirstPromoter ever sunsets your account, raises pricing, or you just want to bring the program in-house, the path off is “rebuild from a CSV.” With OpenPartner the path is docker compose up, restore the dump, and run.

Modern integration shape

FirstPromoter’s API was designed for a 2017-shaped problem: brand calls FirstPromoter’s endpoint when something happens. That works.

OpenPartner exposes three explicit integration paths:

1. Server SDK — your backend → us, idempotent, typed
2. Outbound webhooks — us → your stack, signed, retried
3. Partner postbacks — us → the partner’s tracker (Voluum/Binom/RedTrack), per-partner templates with macro replacement

The third one is the wedge. If you’ve ever onboarded a performance affiliate with a real tracker stack, the first thing they ask for is an S2S postback URL. FirstPromoter doesn’t have a clean answer; OpenPartner does.

Pricing shape

FirstPromoter’s tiers are flat-rate by program-size proxy (typically partner count or tracked revenue). OpenPartner’s hosted plans are $0 + 3% revshare or $49 + 1.5%. For a small program FirstPromoter is often cheaper-by-the-month; for a successful program OpenPartner’s percentage scales down with volume more cleanly.

The honest comparison is total cost at one-year revenue, not monthly cost at signup. Run the numbers on your expected partner-driven GMV and the answer flips somewhere in the middle.

The honest decision tree

Pick FirstPromoter if:

• Your partners are global and PayPal is the payout rail you must hit
• Your buyer journey is single-session (click and convert same hour, mostly desktop)
• Last-click is the right model now and forever
• You’re a non-technical founder and want the smallest possible setup surface

Pick OpenPartner if:

• Your buyers convert on Safari and your trial window is longer than a week
• You expect to run multiple attribution models or migrate the program later
• Some of your partners run real tracker stacks and need S2S postbacks
• You want raw events in your own infrastructure (or the option to)
• You bill on Stripe

Both products will run a SaaS affiliate program. They make different bets about which parts of “running a SaaS affiliate program” deserve product surface. Pick the bet that matches yours.

If you’re past FirstPromoter’s tier and weighing alternatives, the Revshare plan is no monthly fee — try it without committing.