Everflow vs PartnerStack

Everflow is a partner marketing and affiliate tracking platform based in Mountain View, California, founded in 2016 and preparing for its tenth anniversary in 2026. It serves brands, affiliate networks and agencies that pay partners for sales, leads or installs. Its core job is to track every click and conversion back to the right partner, pay them correctly and show which partners actually drive revenue. In December 2025 the company said it tracked $4.3 billion in partner revenue, up 19% year over year.

Everflow tracks repeat purchases, upsells and subscriptions, and can pay on later-stage events such as approved leads, SQLs or retained customers through HubSpot and Salesforce. Everflow Pay manages payouts, a Marketplace helps recruit affiliates, and traffic health monitoring flags blocked or broken tracking links. It also pulls spend from Google Ads, Facebook and TikTok for blended attribution, and it is API-first, with an MCP server for AI agents. Pricing is quote-only with a 6-month commitment, onboarding and free migration.

Everflow suits performance marketers and networks running serious affiliate volume who need flexible payout rules and server-side tracking. impact.com is the enterprise heavyweight for broader partnership types, PartnerStack focuses on B2B SaaS, and Tapfiliate or Post Affiliate Pro are cheaper self-serve tools for smaller programs.

Buying tip: there is no public price and the 6-month commitment applies, so prepare your monthly click, conversion and payout volumes before the sales call and ask which integrations and seats are included.

PartnerStack is a partner relationship management platform for B2B SaaS companies, based in Toronto and originally launched as GrowSumo. It lets software companies run affiliate, referral, reseller and agency programs in one system, and differs from most affiliate tools through its marketplace: a network of partners actively looking for SaaS products to promote.

Companies recruit partners from the marketplace or invite their own, onboard them with tailored resources and training, and track clicks, leads, deals and subscriptions through integrations with Stripe, Chargebee, Recurly, HubSpot and Salesforce. Commissions can be one-time, recurring or tiered, and PartnerStack pays partners globally in consolidated payouts, taking on the administrative work of tax forms and currencies. Reporting shows partner-sourced revenue, and partners get a single dashboard across every program they join. Pricing is quote-based with annual contracts.

PartnerStack fits growth-stage and established B2B SaaS companies that treat partnerships as a real revenue channel and want access to an existing partner network. Early-stage startups usually find it too expensive and complex for a first affiliate program; Rewardful, Tolt and FirstPromoter launch faster at flat monthly prices. Impact.com covers broader partnership types beyond SaaS, and Crossbeam focuses on account mapping between partners rather than payouts.