Checkout Upsell Shopify Apps – Analytics & Insights

UpsellPlus Checkout Upsell ranks #1 for checkout upsell with 2.5% share — the leader position in a fragmented field where many apps are within striking distance, -53.0pp ahead of Upsell & Cross Sell — Selleasy (55.5%). Aftersell Post Purchase Upsell sits at #3 with 17.6% share, rounding out the top tier. Together, the top 3 apps absorb 75.7% of all checkout upsell installs — a highly concentrated landscape with limited room for new entrants. Upsell & Cross Sell — Selleasy is the standout mover this month, climbing 5 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.

Checkout Upsell is a fragmented market — the top 3 apps together hold only 75.7% of installs, leaving UpsellPlus Checkout Upsell's 2.5% lead modest in absolute terms and Aftersell Post Purchase Upsell at 17.6% still capturing meaningful share. With this many viable apps, pricing model and integration depth differentiate checkout upsell options more than rank does.

UpsellPlus Checkout Upsell climbed from #5 (Sep 2025) to #1 (Sep 2026) — a 4-position gain among checkout upsell apps over the charted window. Across the top 5 plotted checkout upsell apps, 4 improved their ranking while 1 declined — the category is moving upward overall. UpsellPlus Checkout Upsell's share expanded +2.3pp from 0.2% (Sep 2025) to 2.5% (Sep 2026) — a sustained widening of the gap against other checkout upsell apps over this window.

A 4-position move for the leader over the charted checkout upsell window is large enough to reflect real merchant adoption shifts, not just App Store noise — UpsellPlus Checkout Upsell's climb as of Sep 2026 is the strongest trajectory signal in this chart.

United States dominates demand for checkout upsell apps with 30.1% of all tracked installs — a single market that effectively defines the category's product priorities. United Kingdom follows at 8.8%, with Australia at 6.8%. Together, the top 3 markets account for 45.6% of checkout upsell app installs worldwide. Germany (5.1%) and Netherlands (4.3%) round out the top 5.

With 30.1% of checkout upsell 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.

Upsell & Cross Sell — Selleasy reached 1,000 reviews in 32 months since launch — the fastest ramp among the top 5 checkout upsell apps tracked here. Aftersell Post Purchase Upsell crossed the same milestone in 73 months, 41 months behind.

3 apps on this chart haven't yet crossed 1,000 reviews: SMART Checkout Rules & Upsells at 669, Kaching Post Purchase Upsell at 307, UpsellPlus Checkout Upsell at 124 cumulative reviews. SMART Checkout Rules & Upsells is closest to the milestone — its current count puts it roughly 67% of the way to 1,000.

The 41-month gap between Upsell & Cross Sell — Selleasy's and Aftersell Post Purchase Upsell's time-to-1,000 highlights how unevenly product-market fit landed across this checkout upsell set — the leader found its merchant audience early, while late-rampers took multiple years to reach the same review depth. For merchants comparing these apps today, slower-ramping apps may have closed the functionality gap but still operate on smaller review bases.