Every vendor-funded headless cost calculator stops at "platform + hosting." It's the equivalent of pricing a car by the engine alone — accurate in isolation, useless as a buying decision. The real number includes the maintenance tax, the peripheral rebuilds you didn't budget for, and the opportunity cost of the engineering hours you spent on infrastructure instead of growth.
Below: a line-by-line, three-year cost breakdown for a representative store doing $250K/year on Wix Stores. The methodology applies to Shopify and Webflow with small adjustments.
The visible cost (what vendors show you)
| Item | Year 1 | Year 2 | Year 3 |
|---|---|---|---|
| Wix Business VIP | $708 | $708 | $708 |
| Vercel Pro hosting | $240 | $240 | $240 |
| Trama Pro bridge | $588 | $588 | $588 |
| Initial engineering (80 hrs × $100) | $8,000 | — | — |
| Visible subtotal | $9,536 | $1,536 | $1,536 |
Three-year visible total: $12,608. This is the number on most vendor sites.
The invisible cost (what nobody shows you)
Add the line items below — every one of them is real, every one of them gets missed.
| Item | Year 1 | Year 2 | Year 3 |
|---|---|---|---|
| Maintenance (dependency bumps, API changes) | $2,000 | $2,000 | $2,500 |
| Peripheral rebuilds (account pages, blog, search) | $4,000 | $500 | $500 |
| SEO migration (sitemaps, redirects, structured data) | $1,500 | — | — |
| App replacements (popups, upsell, reviews) | $1,500 | $400 | $400 |
| Analytics + tracking rewiring | $800 | — | — |
| QA + UAT cycles | $1,200 | $400 | $400 |
| Invisible subtotal | $11,000 | $3,300 | $3,800 |
Three-year invisible total: $18,100. That's 144% of the visible number.
The honest total
$12,608 visible + $18,100 invisible = $30,708 over 3 years. Annualised: ~$10,200/year for a $250K/year store — about 4% of revenue.
That's defensible if the store actually grows revenue or margin as a result. If it doesn't — if the headless project is a same-store redesign that doesn't move conversion — you've spent $30K to maintain the status quo with prettier architecture.
Where the line items vary
- Shopify Plus stores: maintenance drops (better tooling), platform cost rises sharply ($2,000+/mo).
- Sub-$100K stores: setup is roughly the same; the percentage of revenue spent on headless overhead becomes painful (15%+).
- Stores using 10+ injected apps: peripheral rebuilds balloon — easily $10-20K of additional year-1 cost.
- Stores with a marketing-led design system: SEO migration is the line item that hurts most. Plan for $3-5K, not $1,500.
What stays the same
- Catalog and inventory ops — your team still updates products on the platform admin.
- Order fulfillment — flows through the platform as before.
- Payments and PCI scope — hosted checkout means no new compliance burden.
- Customer support tools — Wix Inbox, Shopify Inbox, etc. still work.
The pitch isn't "headless is too expensive." It's that the real cost is double what the vendors quote and you should budget for that double from day one. Then decide whether the value is worth it.
Run the numbers on your store.
Our cost calculator builds a 3-year line item for your specific traffic, catalog size, and platform. No email gate.