Custom Domain Shopify Apps – Analytics & Insights

Affiliate Marketing ReferrLy holds the top spot for custom domain with 33.4% market share, but the gap to challengers is closing, -21.2pp ahead of UpPromote Affiliate Marketing (54.5%). BixGrow Affiliate Marketing sits at #3 with 7.2% share, rounding out the top tier. Together, the top 3 apps absorb 95.1% of all custom domain installs — a highly concentrated landscape with limited room for new entrants. Simple Affiliate is the standout mover this month, climbing 2 positions — a momentum signal worth tracking. Worth noting: the top-ranked app and the highest-share app aren't the same here — App Store rank and our market share metric (computed from review counts and other factors) move on independent dynamics, so cross-checking both views matters in this category.

Affiliate Marketing ReferrLy leads at 33.4%, only -21.2pp ahead of UpPromote Affiliate Marketing (54.5%), with rankings stable this month. When the top two custom domain apps demonstrate similar real-world adoption, fit-for-store usually matters more than rank — comparing pricing model, integration depth, and support hours separates them better than the share gap does.

Affiliate Marketing ReferrLy climbed from #2 (May 2026) to #1 (Oct 2026) — a 1-position gain among custom domain apps over the charted window. Across the top 5 plotted custom domain apps, 2 improved their ranking while 1 declined — the category is moving upward overall. Affiliate Marketing ReferrLy's share held near 33.4% from May 2026 to Oct 2026 — a stable install base for custom domain apps rather than active gain or loss.

Stable rankings across the top 5 plotted custom domain apps mean merchants have largely settled on their preferences — challengers below the top 5 face an uphill path to break in.

United States dominates demand for custom domain apps with 43.7% of all tracked installs — a single market that effectively defines the category's product priorities. United Kingdom follows at 8.8%, with Germany at 7.9%. Together, the top 3 markets account for 60.4% of custom domain app installs worldwide. Australia (4.5%) and Canada (4.3%) round out the top 5.

With 43.7% of custom domain app installs concentrated in United States, the leading apps in this category typically prioritize United States-based merchants for localization, currency, and support hours — merchants in United Kingdom (8.8%) and other regions sometimes find better fit in apps that over-index outside United States.

BixGrow Affiliate Marketing reached 1,000 reviews in 46 months since launch — the fastest ramp among the top 5 custom domain apps tracked here. UpPromote Affiliate Marketing in 52 months, and Affiliate Marketing ReferrLy took 64 months to cross the same milestone, a 18-month spread between the fastest and slowest in the set.

2 apps on this chart haven't yet crossed 1,000 reviews: Affilitrak Affiliate Marketing at 269, Referral Program ‑ Shopjar at 148 cumulative reviews. Affilitrak Affiliate Marketing is closest to the milestone — its current count puts it roughly 27% of the way to 1,000.

The 18-month spread between BixGrow Affiliate Marketing and Affiliate Marketing ReferrLy reaching 1,000 reviews suggests a competitive custom domain category — leaders pulled ahead by roughly a year, but no single app dominated launch-to-milestone speed. The ramp differences likely reflect both product quality and timing-of-launch rather than one clear category winner.