ecomrestack

battles / Checkout

OrderBump vs SellUp

OrderBump ($79/mo/mo, vibe code 8/10) vs SellUp ($30/mo/mo, vibe code 9/10). SellUp is the easier one to rebuild yourself — here is what you lose either way.

OrderBump
CLONE

Checkout

$79/mo/mo

Vibe code8/10
Moat1/10
MVP
1 week
Full replacement
2 months, due to testing edge-case payment methods and checkout extension sandboxing
get the build prompt →
SellUp
CLONE

Checkout

$30/mo/mo

Vibe code9/10
Moat0/10
MVP
1 weekend
Full replacement
2 weeks, spent mostly testing compatibility across edge-case Shopify theme CSS and cart implementations

easier to rebuild

get the build prompt →

price gap / year

$588/mo

running both / year

$1,308/mo

our call

Start with SellUp — highest vibe code, weakest moat.

OrderBump

OrderBump is essentially a thin configuration wrapper around Shopify Checkout UI Extensions and Post-Purchase APIs. If you have developer access, you can write the extension components and conditional triggers in a single weekend.

you can rebuild

  • In-checkout product offer widgets using Checkout UI Extensions
  • Post-purchase 1-click upsell pages before thank-you page redirect
  • Rule engine based on cart total, product tags, or specific items
  • Dynamic discount application via Shopify Native Discount APIs
  • Basic offer performance and conversion tracking

real moats

  • Distribution network and reviews on the Shopify App Store
  • Zero-friction setup for non-technical merchant staff
  • Maintenance commitment for Shopify API breaking changes

open source escape hatches

SellUp

SellUp is a thin UI wrapper over Shopify's native Ajax Cart API and GraphQL Admin API. Building a custom theme app block with basic mapping rules takes days and eliminates a perpetual monthly app fee.

you can rebuild

  • On-page embedded upsell widgets on product pages
  • Post-add-to-cart modal popups with single-click variant additions
  • Rule-based product matching (trigger product -> target offer)
  • Auto-apply discount code logic on cross-sell acceptance
  • Basic impression and conversion analytics tracking

what you lose

  • Turnkey multi-theme CSS auto-matching engine
  • Pre-built mobile-responsive modal UI templates
  • Built-in analytics dashboard for tracking offer conversion rates
  • No-code admin panel for non-technical team members to edit offers
  • Automatic edge-case handling for inventory out-of-stock states

real moats

  • Low price point ($15/mo) makes engineering cost hard to justify for single-store non-developers
  • Pre-configured UI components that look decent across thousands of different Shopify themes
  • Established app store distribution and reviews

open source escape hatches

Questions people ask

Which is easier to rebuild with AI, OrderBump or SellUp?

SellUp. It scores 9/10 on vibe code with a moat of 0/10, so an AI-assisted MVP takes about 1 weekend and a full replacement about 2 weeks, spent mostly testing compatibility across edge-case Shopify theme CSS and cart implementations.

Which one costs less, OrderBump or SellUp?

SellUp at $30/mo/mo for a typical mid-market store. The gap between the two is about $588/mo a year.

What do I lose if I replace OrderBump?

OrderBump keeps its vendor support and integration ecosystem.

What do I lose if I replace SellUp?

Turnkey multi-theme CSS auto-matching engine Pre-built mobile-responsive modal UI templates Built-in analytics dashboard for tracking offer conversion rates

One e-commerce SaaS teardown every week.

Honest verdicts, build prompts and overlooked vertical SaaS opportunities. No tracking pixels, no drip sequence, unsubscribe in one click.

free forever · no third-party tracking · the prompts stay public