Verdict up front
Amazon wins on day-one traffic — you list a product and Amazon's marketplace search shows it to shoppers within hours, with zero SEO work on your part. Shopify wins on compounding — your domain accumulates Google SEO equity, AI shopping reach via Catalog, and direct customer data over years. Run Amazon as a distribution channel when you need immediate cash flow. Run Shopify as the long-term brand asset. Run both if your category can support both.
Side-by-side mechanics
A working comparison needs a grid you can scan. The 'SEO' column for Amazon refers to Amazon's internal A9 / COSMO ranking; the Shopify column refers to Google SEO + AI shopping. They're different surfaces; the grid names which platform wins on each dimension.
AI shopping: Catalog vs A9 + COSMO
Shopify Catalog distributes eligible products to ChatGPT, Microsoft Copilot, Google AI Mode and Gemini, Perplexity, and Shop. Amazon's product surface is its own marketplace search (A9 historically, now augmented by COSMO and Rufus, Amazon's in-platform AI shopping assistant). The two systems don't overlap — Shopify products show up in third-party AI engines via Catalog; Amazon products show up in Amazon's own search and AI surfaces.
Compounding asset vs rented shelf
The honest 2026 framing: Shopify is an asset that compounds over years. Every blog post you write, every PDP you optimise, every product schema you implement, every customer email you collect builds value you own. Amazon is a channel — every listing you optimise builds value Amazon owns. The work doesn't stop compounding when you stop paying Shopify; it does stop compounding the day Amazon suspends your account.
Fees and economics
Amazon's typical fee structure: $39.99/mo for the Pro seller plan, plus 15% referral fee (varies by category), plus FBA fulfillment fees ($3–$20+ per unit depending on size and weight), plus optional Sponsored Products advertising. Shopify's structure: $39–$399/mo plan fee, 0% transaction fee on Shopify Payments (or 0.5–2% on third-party gateways), plus your fulfillment cost.
Who each platform fits
Amazon fits high-velocity low-AOV commodities, brands using FBA for fulfillment efficiency, and merchants who need marketplace traffic to validate product-market fit fast. Shopify fits brand-led D2C businesses, high-AOV products, brands compounding email lists and content, and any merchant whose growth model assumes AI shopping channels will recommend their products.
When ShopifyRanked is the right answer
If you're an Amazon seller launching a Shopify storefront — or a brand who decided to invest in the owned channel — and you want the Catalog Readiness install done right, that's the 7-day done-for-you ShopifyRanked install. $499 one-time, 14-day Walk-Away Guarantee. Catalog audit, PDP rewrites, Knowledge Base, robots.txt.liquid, 30-day visibility report.